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1. Position and Role of Business in Economic Security System as in the Case of the Russian Federation

Author

Ostaev, G. Ya., Mukhina, I. A., Kondratiev, D. V., Gogolev, I. M., Chazova, I. Yu., Zlobina, O. O., Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Isaeva, Ekaterina, editor, and Rocha, Álvaro, editor

Published
2023
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7. ON THE PROBLEM OF CORRECTING TWISTED TURBINE BLADES

Author

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, Gogolev,I. G., Dyakonov,R. I., Kuzmichev,R. V., FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, Gogolev,I. G., Dyakonov,R. I., and Kuzmichev,R. V.

Abstract

A series of studies on steam and gas turbines with blades twisted according to a specific relationship were tested at a given blade aspect ratio. Some of the models were made with shrouded and shroudless rotor blades and with a sealing ring, and in some cases, cylindrical guide vanes were used. The investigation results for some stages are plotted using graphs to represent the variation in the experimental and calculated values of the degree of reaction and angle at various ratios. This distribution of the parameters along the blade height is caused mainly by the secondary flow and the overflow of the working substance in the axial and radial clearances near the transverse flow boundary. Consequently, negative angles of attack are created near the blade root, and positive angles are created at the periphery. These angles of attack increase the stage energy losses and reduce its efficiency. Improper angles of attack can reduce stage efficiency by approximately 0.5 percent. The relation of the degree of reaction and the angles of attack is shown in the appropriate figure in the text. The rotor blade correction method is discussed., Edited trans. of Izvestiya Vysshikh Uchebnykh Zavedenii. Energetika (USSR) v10 n9 p62-67 1967.

Published
1969

11. Effects of Temperature, Operation Mode, and Steam Concentration on Alkali Release in Chemical Looping Conversion of Biomass-Experimental Investigation in a 10 kW th Pilot.

Author

Gogolev I, Soleimanisalim AH, Mei D, and Lyngfelt A

Abstract

Alkali release was studied in a 10 kW th chemical looping pilot operated with a Linz-Donawitz (LD) slag oxygen carrier (OC) and three biomass fuels. Experiments were performed at three temperatures and in three operation modes: chemical looping combustion (CLC), chemical looping gasification (CLG), and oxygen-carrier-aided combustion (OCAC). Gas-phase alkali release was measured with a surface ionization detector (SID). Fuel reactor (FR) gas-phase alkali emissions increased with the temperature. This occurred as a result of increased evaporation of KCl and enhanced decomposition of alkali salts during char conversion. Air reactor (AR) alkali emissions were lower than in the FR and independent of the operating temperature. In comparison of operating modes, CLC and CLG modes resulted in similar gas-phase alkali emissions due to the similar extent of char conversion. In contrast, operation of the reactor system in OCAC mode resulted in significantly lower levels of gas-phase alkalis. The difference in alkali emission was attributed to the steam-rich atmosphere of CLC. The effect of steam was further investigated in CLC and OCAC tests. Lowering steam concentrations in CLC operation resulted in lower gas-phase alkali emissions, while introducing steam to the FR during OCAC operation resulted in higher alkali emissions. It was concluded that steam likely enhances gas-phase K release through a reaction of K 2 CO 3 within the fuel char with steam to produce KOH(g). Solid sampling and analysis for K content was used along with SID measurements to develop a K mass balance for the reactor system. Mass balance results for the straw pellet fuel tests showed that LD slag OC absorbs approximately 15-51% of fuel K, 2.2% of fuel K is released to the gas phase, and up to 3.4% of fuel K is captured in the AR fly ash. The residual 40-80% of fuel K was determined to leave the FR as K-rich fly ash., Competing Interests: The authors declare no competing financial interest., (© 2022 The Authors. Published by American Chemical Society.)

Published
2022
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