Cavitation Auto-oscillation in Inducer Pump-pipes System
Details of measurements on the instability known as auto-oscillation which occurs in the pumppipes hydraulic system are presented, the inherent mechanism of its production, development and disappearance are analyzed. The cavities dynamic linear equations are based on free streamline cascade theory, including non-backflow equation and backflow equation. The current study focuses on the feed effect of auto-oscillation energy during the process of transfer in the close loop system. Autooscillation occurs during the whole process of cavitation. It has been shown that auto-oscillation is a system oscillation caused by the active dynamic characteristics of the cavitating pump. The system conditions influence on the system stability and frequency is analyzed. Based on the dynamic analysis, backflow equation is first adopted to analyze the pulsating flow instability rapidly, which is more suitable for the calculation of LPREs cavitating pump. These strongly suggest that the pump dynamics are primarily determined by the complicated flow at inlet to the inducer which involves cavities and preswirl generated by a strong backflow. The numerical results are consistent with the characteristics observed in some low frequency dynamic tests on rocket engine turbopumps.
cavitation auto-oscillation inducer backflow instability frequency
Zhang Miao Li Bin Zhang Lihui
Xian Aerospace Propulsion Institute, Xian, 710100, China School of Astronautics, Beihang University, Beijing, 100191, China
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
1092-1096
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）