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33 results on '"Shaker A. F."'

1. Assessment of Compression Design of CFST

Author

Hussein, Ibrahim S., Fawzy, Mona M., Shaker, M. F., Deifalla, Ahmed F., Ghanem, Gouda M., Shehata, Hany Farouk, Editor-in-Chief, ElZahaby, Khalid M., Advisory Editor, Chen, Dar Hao, Advisory Editor, Amer, Mourad, Series Editor, Mosallam, Ayman S., editor, El Bhiri, Brahim, editor, Karbhari, Vistasp M., editor, and Saadeh, Shadi, editor

Published
2023
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2. Enhancing heat transfer with a synthetic jet for thermal management applications.

Author

Shaker, Sufian F.

Subjects
*JETS (Fluid dynamics), *COMPUTATIONAL fluid dynamics, *NUSSELT number, *NATURAL heat convection, *FLUID flow, *JET impingement
Abstract

This article explores the utilization of a synthetic jet as an approach to cool microelectronic devices, addressing their thermal management needs. The study includes both experimental measurements and numerical simulations to gain a comprehensive understanding of the heat transfer characteristics and fluid flow patterns generated by the synthetic jet actuator. The average Nusselt number (Nu) of the synthetic jet impinging flow with the dimensionless separation distances of the orifice to the heated surface (H/D) is investigated at different Reynolds numbers. A dynamic mesh scheme is employed in performing the simulations of the fluid domain to showcase the diaphragm's vibration and its deformation over time. The velocity profiles exhibit that the synthetic jet flow prompts the formation of two countervortices during every vibrating cycle of the diaphragm. The experimental results align closely with the predicted outcomes, indicating that the synthetic jet significantly enhances heat transfer by 3.1 times relative to the natural convection in the case of (H/D = 8.4) across different Reynolds numbers while maintaining low power consumption, a compact size, and a noise‐free operation. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Nature along Man's Journey of Return.

Author

Shaker, Anthony F.

Subjects
*PHILOSOPHY of nature, *CLIMATE change, *ISLAMIC philosophy, *HUMAN beings, *BIOLOGICAL rhythms
Abstract

This paper examines some key aspects of the formal and figurative discourse on 'nature' as manifested in the philosophical tradition and with reference to contemporary life. Instead of building a straightforward, self-enclosed argument for the sake of argument, it will demonstrate how someone living today may arrive at certain kinds of judgments in the light both of our collective human inheritance, of which Ḥikma is a major element, and a philosophical reasoning that penetrates into areas of life with which philosophy is not directly or primarily concerned but which are of fundamental importance to all human beings. It begins by sketching a picture of the present historical moment, which many specialists consider a historical anomaly precipitated by the abrupt rise to world domination by a single geographical region. A few basic themes relating to 'nature', which by tradition has been approached either figurately or formally, will then be discussed. Their upshot is that for man to live 'naturally', he cannot reduce his own nature to that of other animals. Every being has its particular nature. Therefore, the concept of nature cannot be considered only unconditionally or as something common to all animals. Finally, this paper poses two basic questions: Why has our necessary--but equally 'natural'--separation from the nature of other beings been allowed to go as far as it has? Are we so alone in our modern troubles that we must cast off our human inheritance and pretend to reinvent the universe at every turn? [ABSTRACT FROM AUTHOR]

Published
2023
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13. Wytyczne ESC/ESH dotyczace postȩpowania w nadciśnieniu tȩtniczym (2018): Grupa Robocza Europejskiego Towarzystwa Kardiologicznego (ESC) i Europejskiego Towarzystwa Nadciśnienia Tȩtniczego (ESH) do spraw postȩpowania w nadciśnieniu tȩtniczym

Author

Williams B., Mancia G., Spiering W., Rosei E. A., Azizi M., Burnier M., Clement D. L., Coca A., De Simone G., Dominiczak A., Kahan T., Mahfoud F., Redon J., Ruilope L., Zanchetti A., Kerins M., Kjeldsen S. E., Kreutz R., Laurent S., Lip G. Y. H., McManus R., Narkiewicz K., Ruschitzka F., Schmieder R. E., Shlyakhto E., Tsioufis C., Aboyans V., Desormais I., Windecker S., Agewall S., Barbato E., Bueno H., Collet J. -P., Coman I. M., Dean V., Delgado V., Fitzsimons D., Gaemperli O., Hindricks G., Iung B., Juni P., Katus H. A., Knuuti J., Lancellotti P., Leclercq C., McDonagh T. A., Piepoli M. F., Ponikowski P., Richter D. J., Roffi M., Simpson I. A., Sousa-Uva M., Zamorano J. L., Lurbe E., Bochud M., Jelakovic B., Januszewicz A., Polonia J., Van De Borne P., Borghi C., Parati G., Manolis A., Lovic D., Benkhedda S., Zelveian P., Siostrzonek P., Najafov R., Pavlova O., De Pauw M., Dizdarevic-Hudic L., Raev D., Karpettas N., Olsen M. H., Shaker A. F., Viigimaa M., Baranova E. I., Metsarinne K., Halimi J. -M., Pagava Z., Thomopoulos C., Bertomeu-Martinez V., Wittekoek J., Andersen K., Shechter M., Romanova T., Bajraktari G., Saade G. A., Sakalyte G., Noppe S., Trusinskis K., Vavlukis M., DeMarco D. C., Caraus A., Schunkert H., Aksnes T. A., Jankowski P., Linhart A., Vinereanu D., Foscoli M., Dikic A. D., Filipova S., Fras Z., Burkard T., Carlberg B., Sdiri W., Aydogdu S., Sirenko Y., Pall D., Brady A., Mercuro G., Weber T., Lazareva I., De Backer T., Sokolovic S., Chazova I., Porsti I., Denolle T., Stergiou G. S., Segura J., Miglinas M., Kramer B. K., Gerdts E., Tykarski A., De Carvalho Rodrigues M., Widimsky J., Dorobantu M., Brguljan J., Pechere-Bertschi A., Gottsater A., Erdine S., Williams, B, Mancia, G, Spiering, W, Rosei, E, Azizi, M, Burnier, M, Clement, D, Coca, A, De Simone, G, Dominiczak, A, Kahan, T, Mahfoud, F, Redon, J, Ruilope, L, Zanchetti, A, Kerins, M, Kjeldsen, S, Kreutz, R, Laurent, S, Lip, G, Mcmanus, R, Narkiewicz, K, Ruschitzka, F, Schmieder, R, Shlyakhto, E, Tsioufis, C, Aboyans, V, Desormais, I, Windecker, S, Agewall, S, Barbato, E, Bueno, H, Collet, J, Coman, I, Dean, V, Delgado, V, Fitzsimons, D, Gaemperli, O, Hindricks, G, Iung, B, Juni, P, Katus, H, Knuuti, J, Lancellotti, P, Leclercq, C, Mcdonagh, T, Piepoli, M, Ponikowski, P, Richter, D, Roffi, M, Simpson, I, Sousa-Uva, M, Zamorano, J, Lurbe, E, Bochud, M, Jelakovic, B, Januszewicz, A, Polonia, J, Van De Borne, P, Borghi, C, Parati, G, Manolis, A, Lovic, D, Benkhedda, S, Zelveian, P, Siostrzonek, P, Najafov, R, Pavlova, O, De Pauw, M, Dizdarevic-Hudic, L, Raev, D, Karpettas, N, Olsen, M, Shaker, A, Viigimaa, M, Baranova, E, Metsarinne, K, Halimi, J, Pagava, Z, Thomopoulos, C, Bertomeu-Martinez, V, Wittekoek, J, Andersen, K, Shechter, M, Romanova, T, Bajraktari, G, Saade, G, Sakalyte, G, Noppe, S, Trusinskis, K, Vavlukis, M, Demarco, D, Caraus, A, Schunkert, H, Aksnes, T, Jankowski, P, Linhart, A, Vinereanu, D, Foscoli, M, Dikic, A, Filipova, S, Fras, Z, Burkard, T, Carlberg, B, Sdiri, W, Aydogdu, S, Sirenko, Y, Pall, D, Brady, A, Mercuro, G, Weber, T, Lazareva, I, De Backer, T, Sokolovic, S, Chazova, I, Porsti, I, Denolle, T, Stergiou, G, Segura, J, Miglinas, M, Kramer, B, Gerdts, E, Tykarski, A, De Carvalho Rodrigues, M, Widimsky, J, Dorobantu, M, Brguljan, J, Pechere-Bertschi, A, Gottsater, A, and Erdine, S

Subjects
Antihypertensive Agent, Cardiology, Disease Management
Published
2019

14. Wytyczne ESC/ESH dotyczace postȩpowania w nadciśnieniu tȩtniczym (2018): Grupa Robocza Europejskiego Towarzystwa Kardiologicznego (ESC) i Europejskiego Towarzystwa Nadciśnienia Tȩtniczego (ESH) do spraw postȩpowania w nadciśnieniu tȩtniczym

Author

Williams, B, Mancia, G, Spiering, W, Rosei, E, Azizi, M, Burnier, M, Clement, D, Coca, A, De Simone, G, Dominiczak, A, Kahan, T, Mahfoud, F, Redon, J, Ruilope, L, Zanchetti, A, Kerins, M, Kjeldsen, S, Kreutz, R, Laurent, S, Lip, G, Mcmanus, R, Narkiewicz, K, Ruschitzka, F, Schmieder, R, Shlyakhto, E, Tsioufis, C, Aboyans, V, Desormais, I, Windecker, S, Agewall, S, Barbato, E, Bueno, H, Collet, J, Coman, I, Dean, V, Delgado, V, Fitzsimons, D, Gaemperli, O, Hindricks, G, Iung, B, Juni, P, Katus, H, Knuuti, J, Lancellotti, P, Leclercq, C, Mcdonagh, T, Piepoli, M, Ponikowski, P, Richter, D, Roffi, M, Simpson, I, Sousa-Uva, M, Zamorano, J, Lurbe, E, Bochud, M, Jelakovic, B, Januszewicz, A, Polonia, J, Van De Borne, P, Borghi, C, Parati, G, Manolis, A, Lovic, D, Benkhedda, S, Zelveian, P, Siostrzonek, P, Najafov, R, Pavlova, O, De Pauw, M, Dizdarevic-Hudic, L, Raev, D, Karpettas, N, Olsen, M, Shaker, A, Viigimaa, M, Baranova, E, Metsarinne, K, Halimi, J, Pagava, Z, Thomopoulos, C, Bertomeu-Martinez, V, Wittekoek, J, Andersen, K, Shechter, M, Romanova, T, Bajraktari, G, Saade, G, Sakalyte, G, Noppe, S, Trusinskis, K, Vavlukis, M, Demarco, D, Caraus, A, Schunkert, H, Aksnes, T, Jankowski, P, Linhart, A, Vinereanu, D, Foscoli, M, Dikic, A, Filipova, S, Fras, Z, Burkard, T, Carlberg, B, Sdiri, W, Aydogdu, S, Sirenko, Y, Pall, D, Brady, A, Mercuro, G, Weber, T, Lazareva, I, De Backer, T, Sokolovic, S, Chazova, I, Porsti, I, Denolle, T, Stergiou, G, Segura, J, Miglinas, M, Kramer, B, Gerdts, E, Tykarski, A, De Carvalho Rodrigues, M, Widimsky, J, Dorobantu, M, Brguljan, J, Pechere-Bertschi, A, Gottsater, A, Erdine, S, Williams B., Mancia G., Spiering W., Rosei E. A., Azizi M., Burnier M., Clement D. L., Coca A., De Simone G., Dominiczak A., Kahan T., Mahfoud F., Redon J., Ruilope L., Zanchetti A., Kerins M., Kjeldsen S. E., Kreutz R., Laurent S., Lip G. Y. H., McManus R., Narkiewicz K., Ruschitzka F., Schmieder R. E., Shlyakhto E., Tsioufis C., Aboyans V., Desormais I., Windecker S., Agewall S., Barbato E., Bueno H., Collet J. -P., Coman I. M., Dean V., Delgado V., Fitzsimons D., Gaemperli O., Hindricks G., Iung B., Juni P., Katus H. A., Knuuti J., Lancellotti P., Leclercq C., McDonagh T. A., Piepoli M. F., Ponikowski P., Richter D. J., Roffi M., Simpson I. A., Sousa-Uva M., Zamorano J. L., Lurbe E., Bochud M., Jelakovic B., Januszewicz A., Polonia J., Van De Borne P., Borghi C., Parati G., Manolis A., Lovic D., Benkhedda S., Zelveian P., Siostrzonek P., Najafov R., Pavlova O., De Pauw M., Dizdarevic-Hudic L., Raev D., Karpettas N., Olsen M. H., Shaker A. F., Viigimaa M., Baranova E. I., Metsarinne K., Halimi J. -M., Pagava Z., Thomopoulos C., Bertomeu-Martinez V., Wittekoek J., Andersen K., Shechter M., Romanova T., Bajraktari G., Saade G. A., Sakalyte G., Noppe S., Trusinskis K., Vavlukis M., DeMarco D. C., Caraus A., Schunkert H., Aksnes T. A., Jankowski P., Linhart A., Vinereanu D., Foscoli M., Dikic A. D., Filipova S., Fras Z., Burkard T., Carlberg B., Sdiri W., Aydogdu S., Sirenko Y., Pall D., Brady A., Mercuro G., Weber T., Lazareva I., De Backer T., Sokolovic S., Chazova I., Porsti I., Denolle T., Stergiou G. S., Segura J., Miglinas M., Kramer B. K., Gerdts E., Tykarski A., De Carvalho Rodrigues M., Widimsky J., Dorobantu M., Brguljan J., Pechere-Bertschi A., Gottsater A., Erdine S., Williams, B, Mancia, G, Spiering, W, Rosei, E, Azizi, M, Burnier, M, Clement, D, Coca, A, De Simone, G, Dominiczak, A, Kahan, T, Mahfoud, F, Redon, J, Ruilope, L, Zanchetti, A, Kerins, M, Kjeldsen, S, Kreutz, R, Laurent, S, Lip, G, Mcmanus, R, Narkiewicz, K, Ruschitzka, F, Schmieder, R, Shlyakhto, E, Tsioufis, C, Aboyans, V, Desormais, I, Windecker, S, Agewall, S, Barbato, E, Bueno, H, Collet, J, Coman, I, Dean, V, Delgado, V, Fitzsimons, D, Gaemperli, O, Hindricks, G, Iung, B, Juni, P, Katus, H, Knuuti, J, Lancellotti, P, Leclercq, C, Mcdonagh, T, Piepoli, M, Ponikowski, P, Richter, D, Roffi, M, Simpson, I, Sousa-Uva, M, Zamorano, J, Lurbe, E, Bochud, M, Jelakovic, B, Januszewicz, A, Polonia, J, Van De Borne, P, Borghi, C, Parati, G, Manolis, A, Lovic, D, Benkhedda, S, Zelveian, P, Siostrzonek, P, Najafov, R, Pavlova, O, De Pauw, M, Dizdarevic-Hudic, L, Raev, D, Karpettas, N, Olsen, M, Shaker, A, Viigimaa, M, Baranova, E, Metsarinne, K, Halimi, J, Pagava, Z, Thomopoulos, C, Bertomeu-Martinez, V, Wittekoek, J, Andersen, K, Shechter, M, Romanova, T, Bajraktari, G, Saade, G, Sakalyte, G, Noppe, S, Trusinskis, K, Vavlukis, M, Demarco, D, Caraus, A, Schunkert, H, Aksnes, T, Jankowski, P, Linhart, A, Vinereanu, D, Foscoli, M, Dikic, A, Filipova, S, Fras, Z, Burkard, T, Carlberg, B, Sdiri, W, Aydogdu, S, Sirenko, Y, Pall, D, Brady, A, Mercuro, G, Weber, T, Lazareva, I, De Backer, T, Sokolovic, S, Chazova, I, Porsti, I, Denolle, T, Stergiou, G, Segura, J, Miglinas, M, Kramer, B, Gerdts, E, Tykarski, A, De Carvalho Rodrigues, M, Widimsky, J, Dorobantu, M, Brguljan, J, Pechere-Bertschi, A, Gottsater, A, Erdine, S, Williams B., Mancia G., Spiering W., Rosei E. A., Azizi M., Burnier M., Clement D. L., Coca A., De Simone G., Dominiczak A., Kahan T., Mahfoud F., Redon J., Ruilope L., Zanchetti A., Kerins M., Kjeldsen S. E., Kreutz R., Laurent S., Lip G. Y. H., McManus R., Narkiewicz K., Ruschitzka F., Schmieder R. E., Shlyakhto E., Tsioufis C., Aboyans V., Desormais I., Windecker S., Agewall S., Barbato E., Bueno H., Collet J. -P., Coman I. M., Dean V., Delgado V., Fitzsimons D., Gaemperli O., Hindricks G., Iung B., Juni P., Katus H. A., Knuuti J., Lancellotti P., Leclercq C., McDonagh T. A., Piepoli M. F., Ponikowski P., Richter D. J., Roffi M., Simpson I. A., Sousa-Uva M., Zamorano J. L., Lurbe E., Bochud M., Jelakovic B., Januszewicz A., Polonia J., Van De Borne P., Borghi C., Parati G., Manolis A., Lovic D., Benkhedda S., Zelveian P., Siostrzonek P., Najafov R., Pavlova O., De Pauw M., Dizdarevic-Hudic L., Raev D., Karpettas N., Olsen M. H., Shaker A. F., Viigimaa M., Baranova E. I., Metsarinne K., Halimi J. -M., Pagava Z., Thomopoulos C., Bertomeu-Martinez V., Wittekoek J., Andersen K., Shechter M., Romanova T., Bajraktari G., Saade G. A., Sakalyte G., Noppe S., Trusinskis K., Vavlukis M., DeMarco D. C., Caraus A., Schunkert H., Aksnes T. A., Jankowski P., Linhart A., Vinereanu D., Foscoli M., Dikic A. D., Filipova S., Fras Z., Burkard T., Carlberg B., Sdiri W., Aydogdu S., Sirenko Y., Pall D., Brady A., Mercuro G., Weber T., Lazareva I., De Backer T., Sokolovic S., Chazova I., Porsti I., Denolle T., Stergiou G. S., Segura J., Miglinas M., Kramer B. K., Gerdts E., Tykarski A., De Carvalho Rodrigues M., Widimsky J., Dorobantu M., Brguljan J., Pechere-Bertschi A., Gottsater A., and Erdine S.

Published
2019

15. Evaluation of the antibacterial activity of citrullus colocynthis extracts (In vitro study).

Author

falih, Hayder yousif, Shaker, Zahraa F., and Abed, Hayder Hamed

Subjects
WATERMELONS, ANTIBACTERIAL agents, URINARY tract infections, PATHOGENIC bacteria, IN vitro studies, STREPTOCOCCUS pneumoniae, MEDICINAL plants
Abstract

The plant of c. colocynthis is perennial herbal of the Cucurbitaceous types that is used as a traditional medicinal plant on a Mediterranean tub and equatorial nations. Studies on the antibacterial properties of Citrullus colocynthis leaf extract, Medicinal plants have conventional been used in abortifacient and treats constipation, edema, Infection caused by bacteria, cancer and diabetes problems. The antibacterial efficacy of citrullus colocynthesis (L.) was investigated in this work using five species of pathogenic bacteria isolated from urinary tract infections: E. coli, Klebsiella pneumoniae, Streptococcus spp, Psudomonas auroginosa, and Staphylococcus aureus. For the antibacterial test, water and ethanol extract were employed. The ethanolic extract showed inhibitory activity against Escherichia Coli at (100 °C, 80 °C, 60 °C) while Staphylococcus aureus at (100 °C, 80 °C), Streptococcus spp. at (100 °C). Water extract exhibited less or no activity against all types of bacteria. The findings of this investigation indicate that C. colocynthis might be utilized to treat disorders caused by the test organisms. [ABSTRACT FROM AUTHOR]

Published
2021
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17. Brand audit: A case study of Lacasa in Spain.

Author

Adidam, Phani and Shaker, Irene F.

Subjects
BRAND name products
Abstract

Assessing a brand's health is a critical task for any company and brand manager. Several approaches have been offered by various scholars and consultants; however, Keller's approach to assessing brand health via conducting a formal brand audit remains one of the most robust methods. In this paper, we adopt the brand audit approach and investigate the Spanish chocolate brand Lacasa. In conclusion, we offer three concrete recommendations to Lacasa's brand managers. [ABSTRACT FROM AUTHOR]

Published
2021
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18. Static stability of the Space Station solar array FASTMast structure

Author

Shaker, John F and Acquaviva, Thomas H

Subjects
Spacecraft Design, Testing And Performance
Abstract

The combined loads test of the 3-Bay FASTMast marks the end of the Lewis Research Center (LeRC) effort to characterize the behavior of the principal Space Station solar array support structure. The primary objective of this test and analysis effort was to develop a method to predict structural stability failure modes under flight-like applied loads. Included at the beginning of this report is a brief historical perspective of the hardware design development and FASTMast structural stability problem evolution. Once an understanding of the solution process has been established, test and analysis details are presented and related to the postulated failure theories. The combined load test series subjected the structure to a combination of transverse, moment, and torsion loads similar to that expected in the service environment. Nonlinear finite element (FE) models were developed and large displacement analyses were performed to support the test effort and failure mode predictions. Details of the test configuration as well as test and analysis results are presented. The results were then critiqued to establish valid and successful support of the failure mode assessments. Finally, study conclusions are drawn and recommendations for safe operation of the FASTMast structure are presented for consideration.

Published
1995

19. Static stability of a three-dimensional space truss

Author

Shaker, John F

Subjects
Spacecraft Design, Testing And Performance
Abstract

In order to deploy large flexible space structures it is necessary to develop support systems that are strong and lightweight. The most recent example of this aerospace design need is vividly evident in the space station solar array assembly. In order to accommodate both weight limitations and strength performance criteria, ABLE Engineering has developed the Folding Articulating Square Truss (FASTMast) support structure. The FASTMast is a space truss/mechanism hybrid that can provide system support while adhering to stringent packaging demands. However, due to its slender nature and anticipated loading, stability characterization is a critical part of the design process. Furthermore, the dire consequences surely to result from a catastrophic instability quickly provide the motivation for careful examination of this problem. The fundamental components of the space station solar array system are the (1) solar array blanket system, (2) FASTMast support structure, and (3) mast canister assembly. The FASTMast once fully deployed from the canister will provide support to the solar array blankets. A unique feature of this structure is that the system responds linearly within a certain range of operating loads and nonlinearly when that range is exceeded. The source of nonlinear behavior in this case is due to a changing stiffness state resulting from an inability of diagonal members to resist applied loads. The principal objective of this study was to establish the failure modes involving instability of the FASTMast structure. Also of great interest during this effort was to establish a reliable analytical approach capable of effectively predicting critical values at which the mast becomes unstable. Due to the dual nature of structural response inherent to this problem, both linear and nonlinear analyses are required to characterize the mast in terms of stability. The approach employed herein is one that can be considered systematic in nature. The analysis begins with one and two-dimensional failure models of the system and its important components. From knowledge gained through preliminary analyses a foundation is developed for three-dimensional analyses of the FASTMast structure. The three-dimensional finite element (FE) analysis presented here involves a FASTMast system one-tenth the size of the actual flight unit. Although this study does not yield failure analysis results that apply directly to the flight article, it does establish a method by which the full-scale mast can be evaluated.

Published
1995

20. Static Stability of a Three-Dimensional Space Truss

Author

Shaker, John F

Subjects
Spacecraft Propulsion And Power
Abstract

Space Station requirements for power have resulted in a need for photovoltaic solar arrays possessing large blanket surface area. However, due to the limited Shuttle payload volume solar array designers have been driven to a deployable concept that by nature is extremely flexible. The principal support for this array system is the Folding Articulating Square Truss Mast (FASTMast). In order to accommodate service loads the FASTMast is expected to exhibit nonlinear behavior which could possibly result in structural instability. Presented herein are the results of the Lewis Research Center test and analysis efforts performed in an effort to characterize the FASTMast structural behavior in terms of stability. Results include those obtained from recent nonlinear testing and analysis involving a 1/10 segment of the FASTMast flight article. Implications of these results as they relate to expected behavior of the flight unit will also be discussed.

Published
1994

32. STUDY ON THE EFFECT OF NUMBER OF FILM COOLING ROWS ON THE THERMAL PERFORMANCE OF GAS TURBINE BLADE.

Author

SHAKER, S. F., ABDULLAH, M. Z., MUJEEBU, M. A., AHMAD, K. A., and ABDULLAH, M. K.

Subjects
*GAS turbine blades, *COOLING, *THERMAL efficiency, *PERFORMANCE evaluation, *COMPUTATIONAL fluid dynamics, *SIMULATION methods & models, *TEMPERATURE distribution
Abstract

This paper presents three dimensional (3D) numerical investigations on the effect of film cooling on the thermal behavior of gas turbine blades, using a commercial computational fluid dynamics (CFD) code. The 3D airfoil geometry of the blade which emulates the actual (A-4 Skyhawk) blade is generated in the pre-processor (GAMBIT). Two cooling configurations namely 1) four rows film cooling with U-bend internal channel and 2) eight rows film cooling with U-bend internal channel, have been simulated to be transonic flow over a turbine blade with turbo-specific non-reflecting boundary conditions (NRBCs). Turbulence is represented using the shear-stress transport (SST) model, and the flow is assumed to have a free-stream turbulence intensity of 9%. The heat transfer coefficient, total temperature distribution, static pressure and velocity vector are investigated. The effect of coolant injection pressure ratio (PR,ci) on temperature distribution is also investigated. The results show that heat transfer coefficient with film cooling is higher than that without film cooling. From the predicted temperature profile, it is observed that the blade with eight rows film cooling with U-bend internal channel shows better cooling performance than that with four rows. Further, increase in PR,ci leads to reduction in temperature and moreover the lateral spreading facilitated the best coolant layer. [ABSTRACT FROM AUTHOR]

Published
2012

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