Effect of Blade Slot Positioning Close to Blade Root on the Performance of Highly Loaded Helium Compressor

Document Type : Regular Article

Authors

1 Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian, Liaoning Province, 116026, China

2 Pakistan Navy Engineering College, National University of Sciences and Technology, Islamabad, 44000, Pakistan

10.47176/jafm.17.4.2200

Abstract

The helium compressor has the inherent characteristics of a lower single-stage pressure ratio and a higher number of stages than an air compressor. The highly loaded design method effectively addressed the compressibility issue of the helium compressor. However, the compressor designed with this technique has narrow passages, short blades, and a large bending angle, making the end-wall secondary flow more intense than a conventional compressor. In this paper, numerical simulation and experimental validation has been conducted to identify the effectiveness of the axial slot close to the blade root in improving end-wall secondary flow in a high-load helium compressor cascade, and to provide data and experimental support for the engineering application of high-load helium compressors. The analytical results show that slotting can utilize the self-pressure difference to generate gap leakage vortices, and the axial momentum generated by the leakage vortices blows away the vortices formed due to the separation of corner area. The airflow flows close to the suction surface of the blade and breaks away at the trailing edge of the blade, merges with the main flow and forms a new vortex. As the height of the channel increases, the blowing away of the vortices in the corner region becomes more pronounced and the cascade improvement performance is better. The test results show that the total pressure loss coefficient at the design operating point is reduced by 6.167% when a slot height of 8.53 mm is positioned at 65% Ca (axial chord length). The improvement effect becomes 16.469% better at a 4° attack angle.

Keywords

Main Subjects


Brent, J. A. (1972 March31). Single-stage experimental evaluation of compressor blading with slots and vortex generators. NTRS - NASA Technical Reports Server. https://ntrs.nasa.gov/citations/19720015141
Chen, Y., Zou, Z., & Fu, C. (2019). A study on the similarity method for helium compressors. Aerospace Science and Technology, 90, 115-126. https://doi.org/10.1016/j.ast.2019.04.026
El-Genk, M. S., & Tournier, J. M. (2008). Noble gas binary mixtures for gas-cooled reactor power plants. Nuclear Engineering & Design, 238(6), 1353-1372. https://doi.org/10.1016/j.nucengdes.2007.10.021
Kadak, A. C. (2016). The status of the US high-temperature gas reactors. Engineering, 2(1), 119-123. https://doi.org/10.1016/J.ENG.2016.01.026
Ke, T., & Zheng, Q. (2010). The highly loaded aerodynamic design and performance enhancement of a helium compressor. Asme Turbo Expo: Power for Land, Sea, and Air, 7, 431-442. https://doi.org/10.1115/GT2010-23116
Ke, T., & Zheng, Q. (2011 January). Design and aerodynamic analysis of a highly loaded helium compressor. ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. http://doi.org/10.1115/GT2011-46044
Ke, T., & Zheng, Q. (2012). Highly loaded aerodynamic design and three dimensional performance enhancement of a HTGR helium compressor. Nuclear Engineering and Design, 249, 256-267. https://doi.org/10.1016/j.nucengdes.2012.03.029
Li, W., Liu, M., & Ji, L.(2023). Study on the trajectory of tip leakage vortex and energy characteristics of mixed-ffow pump under cavitation conditions. Ocean Engineering, 267(2023), 113225. https://doi.org/10.1016/j.oceaneng.2022.113225
Liu, Y., Sun, J., Tang, Y., & Lu, L. (2016). Effect of slot at blade root on compressor cascade performance under different aerodynamic parameters. Applied Sciences, 6(12), 421-421. https://doi.org/10.3390/app6120421
Malik, A., & Zheng, Q. (2020). Effect of helium xenon as working fluid on the compressor of power conversion unit of closed Brayton cycle HTGR power plant. International Journal of Hydrogen Energy, 45(16), 10119-10129. https://doi.org/10.1016/j.ijhydene.2020.01.220
Ramzi, M., Bois, G., & Abderrahmane, Z. (2011). Numerical study of passive control with slotted blading in highly loaded compressor cascade at low mach number. International Journal of Fluid Machinery and Systems, 4(1), 97-103. https://doi.org/10.5293/IJFMS.2011.4.1.097
Tian, Z. (2019). Research on the performance and design method of helium compressor. Harbin Engineering University. http://doi.org/10.27060/d.cnki.ghbcu.2019.000192
Tian, Z., Jiang B., Malik, A., & Zheng, Q. (2019). Axial helium compressor for high-temperature gas-cooled reactor: A review. Annals of Nuclear Energy, 130, 54-68. https://doi.org/10.1016/j.anucene.2019.02.032
Tian, Z., Wang, C., & Zheng, Q. (2021). Investigation of the effects of different working fluids on compressor cascade performance. Applied Sciences, 11(5), 1989. https://doi.org/10.3390/app11051989
Weisbrodt, I. A. (1996, Augest01). Summary report on technical experiences from high-temperature helium turbomachinery testing in germany. International Atomic Energy Agency, Vienna (AT). United States. http://www.osti.gov/etdeweb/biblio/411378
Ye, Q., Su, G., Huang, W., Yang, Y., & Zhang, D. (2022). Research on development strategy of China nuclear energy modernization. Science & Technology Review, 40(24), 20-30. http://kjdb.org/EN/10.3981/j.issn.1000-7857.2022.24.003
Yoon, S., Ajay, R., Chaluvadi, V., Michelassi, V., & Mallina, R. (2019 November 5). A passive flow control to mitigate the corner separation in an axial compressor by a slotted rotor blade. Asme Turbo Expo: Power for Land, Sea, and Air. https://doi.org/10.1115/GT2019-90754
Zhao, W., Jiang, B., Duan, Y., & Zheng, Q. (2021). Effect of partial clearance on the stability of axial compressor at low operating conditions. Journal of Harbin Engineering University, 42(04), 528-534. https://doi.org/10.11990/jheu.201910061
Zhao, W., Jiang, B., Duan, Y., & Zheng, Q. (2022). Stator stall and partial clearance control of compressor. Journal of Aerospace Power, 1-12. https://doi.org/10.13224/j.cnki.jasp.20220164