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15. Characterization of Leading-edge Laminar Separation Bubble for various Angles of Incidence and Reynolds Numbers

Author

Bandopadhyay, Tuhin and Mistry, Chetan S.

Abstract

Low-pressure turbine is a crucial component of the gas turbine engine. The overall performance of the engine strongly depends on the efficiency of the LP turbine. The aerodynamics within the blade passage of an LP turbine is influenced by the presence of high freestream turbulence intensity, off-design angle of incidence, endwall contouring and unsteady upstream wake, which in turn lead to early flow transition and formation of laminar separation bubble on the blade’s suction surface. Notably, LP turbine operates at large positive angle of incidence due to a decrease in Reynolds number during cruise. In such situation, large laminar separation bubble forms near the leading edge on the suction surface of LP turbine blade. The presence of high turbulence intensity and large angle of incidence brings distinct characteristics to the separation bubble and makes it potentially different from the laminar separation bubble that is generally formed on the suction surface of a wing at moderate angle of attack and low turbulent intensity. The extent, height and location of the separation bubble greatly affect the overall drag and lift characteristics of the turbine aerofoil. It is essential to perform detailed characterization of leading-edge laminar separation bubble to understand its effect on the efficiency degradation of LP turbine during cruise. The paper discusses the effect of Reynolds number and angle of incidence on the behaviour of such leading-edge laminar separation bubble, experimentally studied over a flat test plate with elliptical (4:1) leading edge. The test plate is equipped with a flap at the rear to simulate the angle of incidence change on leading edge of LP turbine during cruise. The flow physics concerning the formation process of leading-edge LSB along with its evolution with change in AOI and Rehave been investigated using surface pressure measurement and planar PIV. The bubble length and the height increase with the increment in the angle of incidence. At higher Reynolds number, bubble formation is delayed to higher angle of incidences. The aspect ratio of the bubble also changes with the change in the Reynolds number. Although the separation point moves upstream with an increase in the angle of incidence, the movement rate is significantly lower than the downstream movement of the reattachment point. The obtained results with respect to the bubble formation process and bubble properties agree well with the literature and are discussed in detail in this paper.

Published
2024
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31. Numerical Investigations on Effect of Inflow Parameters on Development of Secondary Flow Field for Linear Low-Pressure Turbine Cascade

Author

Darji, Anand P., Baloni, Beena D., and Mistry, Chetan S.

Abstract

Endwall flows contribute the most crucial role in loss generation for axial flow turbine and compressor blades. These losses lead to modifying the blade loading and overall performance in terms of stable operating range. The present study aimed to determine the endwall flow streams in a low-speed low-pressure linear turbine cascade vane using a numerical approach. The study includes two sections. The first section includes an attempt to understand different secondary flow streams available at the endwall. The location of the horseshoe vortex and subsequent vortex patterns are identified in the section. The selection of a suitable turbulence model among shear stress transport (SST) k–ω and SST γ–θ to identify endwall flow streams is studied prior to the section. The steady-state numerical study is performed using Reynolds Averaged Navier–Stokes equations closed by the SST γ–θ turbulence model. The computational results are validated with experimental results available in the literature and are found to be in good agreement. The study is extended for different inflow conditions in a later section. The second section includes the effect of flow incidence and turbulence intensity on the endwall secondary flow field. Four different inflow incidences are considered for the study. The inlet turbulence intensities are varied by 1% and 10% for each case. The results revealed different secondary flow patterns at an endwall and found the change in behavior with inflow conditions. SST γ–θ turbulence model with lower turbulence intensity is more suitable to identify such flow behavior.

Published
2023
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39. Mixing Analysis of Combined Aeroramp/Strut Injectors in Supersonic Flow

Author

Hemanth, Nikhil, Thakur, Amit, Segal, Corin, Hervatte, Abhay, Shreyas, K. V., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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40. Structural Health Assessment of Gas Turbine Engine Carcass

Author

Kumar, Dilip, Barad, Sanjay G., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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41. Methods of Simulation of Bird-Strikes on Critical Aero Structures with Some Test Cases and Conceptualization of an Alternative Technique for the High-Speed Measurement

Author

Banger, Rajappa, Kumar, Praveen, Sundrani, Rajesh, Mahobia, Anil, Sarangi, Niranjan, Ramesh, P., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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42. Aramid Fiber Composite Layers for Fan Blade Containment in a Gas Turbine System: Some Experimental Studies

Author

Bhat, M. R., Harur Sampath, Dineshkumar, Khatri, Sumit, Umesh, K., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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43. Effecting Critical Frequency Shift in Rotors Using Active Magnetic Bearings

Author

Sankar, Balaji, Manjunath, Pramod, Hemanth Kumar, A., Brijeshkumar, Shah, Sekhar, A. S., Jana, Soumendu, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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44. Experimental Evaluation of Elastic Ring Squeeze Film Dampers for Small Gas Turbine Engine

Author

Thennavarajan, S., Kulkarni, Sadanand, Manikandan, L. P., Jana, Soumendu, Kumar, Ajit, Momin, Iqbal, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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45. Effect of Swirl and Wall Heat Transfer on the Performance of Arcjet Thrusters Using Numerical Modeling

Author

Akhare, Deepak, Nandyala, Hari Prasad, Kumar, Amit, Jayachandran, T., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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46. Analytically Modeling a Dual-Mode Scramjet with Fuel Flow Rate as the Controlling Parameter

Author

Janakiram, Sushmitha, Muruganandam, T. M., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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47. Effect of Activated Charcoal on the Performance of Hybrid Rocket Motor

Author

Kumar, Nitesh, Dinesh, Mengu, Kumar, Rajiv, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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48. Experimental Investigatıon of Cavity Flows with Rear Corner and Face Modifications

Author

Krishna, T. V., Kumar, P., Desikan, S. L. N., Das, S., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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49. Development of Time-Efficient Multi-hole Pressure Probe Calibration Facility

Author

Singh, Ajey, Kumar, Akchhay, Tayal, Gaurav, Mistry, Chetan, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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50. Near-Field Effectiveness of the Sub-Boundary Layer Vortex Generators Deployed in a Supersonic Intake

Author

Humrutha, G., Sinhamahapatra, K. P., Kaushik, M., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, Mistry, Chetan S., editor, Kumar, S. Kishore, editor, Raghunandan, B. N., editor, and Sivaramakrishna, Gullapalli, editor

Published
2021
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