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项乐, 许开富, 陈晖, 谭永华, 李雨濛, 林荣浩. 宽工作范围诱导轮空化不稳定及抑制. 力学学报, 2024, 54(8): 1-12. DOI: 10.6052/0459-1879-24-084
引用本文: 项乐, 许开富, 陈晖, 谭永华, 李雨濛, 林荣浩. 宽工作范围诱导轮空化不稳定及抑制. 力学学报, 2024, 54(8): 1-12. DOI: 10.6052/0459-1879-24-084
Xiang Le, Xu Kaifu, Chen Hui, Tan Yonghua, Li Yumeng, Lin Ronghao. Inducer cavitation instabilities and suppression on wide operating range. Chinese Journal of Theoretical and Applied Mechanics, 2024, 54(8): 1-12. DOI: 10.6052/0459-1879-24-084
Citation: Xiang Le, Xu Kaifu, Chen Hui, Tan Yonghua, Li Yumeng, Lin Ronghao. Inducer cavitation instabilities and suppression on wide operating range. Chinese Journal of Theoretical and Applied Mechanics, 2024, 54(8): 1-12. DOI: 10.6052/0459-1879-24-084

宽工作范围诱导轮空化不稳定及抑制

INDUCER CAVITATION INSTABILITIES AND SUPPRESSION ON WIDE OPERATING RANGE

  • 摘要: 涡轮泵是液体火箭发动机的心脏, 在特定工况下其内部会发生空化不稳定现象, 导致涡轮泵振动量级大幅增加, 严重影响发动机整机工作可靠性. 以决定涡轮泵抗空化能力的关键部件诱导轮为研究对象, 利用空化可视化实验和数值仿真对其内部空化流动特性进行深入分析, 获得60% ~ 120%设计点流量范围完整空化性能曲线, 提出一种基于壳体改进的旋转空化抑制措施, 并揭示抑制机理. 结果表明: 该型诱导轮抗空化能力随流量降低逐渐增强, 空化首先发生在泄漏涡中, 随空化数降低, 泄漏涡空化逐渐沿吸力面向下游发展, 影响相邻叶片冲角, 在小流量范围诱发显著的1.2倍叶轮转频超同步旋转空化现象, 直至空化延伸至叶片流道出口, 导致扬程断裂; 在叶尖前缘壳体设置台阶不会影响诱导轮稳态空化性能, 但会改变泄漏涡空化的发展规律, 使其呈现向上游摆动的趋势, 削弱对相邻叶片冲角的影响, 实现对全流量范围旋转空化的有效抑制. 文章研究对于降低涡轮泵振动量级, 进一步提升液体火箭发动机工作可靠性有一定指导意义.

     

    Abstract: Turbopump is the heart of liquid rocket engine, cavitation instabilities may occur under certain working conditions inside the pump, then the vibration magnitude of turbopump magnifies remarkably, impairing working reliability of the liquid rocket engine. This paper takes the inducer which determines the turbopump cavitation resistance ability as the research object, investigates the cavitating flow characteristics inside an inducer under wide range flow working conditions through visualization experimental techniques and numerical simulation, obtains the whole cavitation performance curves at 60% ~ 120% designed flow rate. A rotating cavitation suppression method based on casing modification has been proposed, and its working mechanism is clarified. It is found that the cavitation resistance ability of the investigated inducer is enhanced with the flow rate decreasing. Cavitation occurs inside the leakage vortex firstly, then the leakage vortex cavitation develops downstream along the suction surface as cavitation number decreases, influencing the angle of attack of the adjacent blade. Remarkable super synchronous rotating cavitation is induced under small flow rate range. The head breakdown occurs until cavitation extends to the outlet of impeller passage. When a step is set on the housing near blade tip leading edge, the stable cavitation performance is not influenced. However, the leakage vortex cavitation development tendency is changed, it swings toward upstream. Then the influence to the angle of the adjacent also weakens, the rotating cavitation under whole flow rate working condition is suppressed effectively. The investigation shows definite guiding significance on reducing the turbopump vibration magnitude, then developing the working reliability of liquid rocket engine.

     

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