Influence of annular grooves with different geometric structures on high-speed induced wheel cavitation performance
WANG Xiaona1, FU Li1,2*, LU Xinggang1, CHENG Xiaorui1,2
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou, Gansu 730050, China
Abstract：In order to further explore ways to improve the cavitation performance of high-speed centri-fugal pumps used in aerospace, and to study the effect of annular groove geometry on the cavitation performance of high-speed inducer wheels, three different geometric shapes of annular grooves, namely rectangular, single curvature and double curvature, were designed. The effectiveness of the numerical simulation method was verified by the external characteristics and cavitation performance test of the original model pump. The numerical simulation of different schemes were carried out to analyze the influence of different geometric annular grooves on the cavitation performance, energy distribution in the flow channel and the inlet flow pattern of the inducer in the high-speed inducer centrifugal pump. The results show that setting the annular groove upstream of the high-speed inducer can reduce the neces-sary cavitation margin of the pump. Among them, the single-curvature groove can reduce the necessary cavitation margin of the centrifugal pump by 27.0%, and the double-curvature groove and the rectangular groove reduce the necessary cavitation margin by 14.7% and 5.4%, respectively. The annular grooves can reduce the influence of the tip clearance backflow on the upstream mainstream, the turbulent kinetic energy distribution on the inducer blade is more uniform, and the pressure in the inducer channel is significantly improved. The transition of the back flow in the single-curvature groove is smoother and the suppression of the circumferential vortex is weaker. The rectangular groove and the double-curvature groove have a stronger ability to absorb the wall vortices, which can weaken the development and influence of the upstream asymmetric vortex-induced wheel channel.
王晓娜,符丽,*,路兴港,程效锐,. 不同几何形状环形槽对高速诱导轮空化性能的影响[J]. 排灌机械工程学报, 2024, 42(2): 124-132.
WANG Xiaona,FU Li,*,LU Xinggang,CHENG Xiaorui,. Influence of annular grooves with different geometric structures on high-speed induced wheel cavitation performance. Journal of Drainage and Irrigation Machinery Engin, 2024, 42(2): 124-132.
