液体火箭发动机诱导轮非定常空化流动特性数值计算  

Numerical prediction of unsteady cavitating flow characteristicsin turbo-pump inducer for liquid rocket engine

作　　者：康亚卓 赵兴安[1] 吴钦[1] 黄彪[1] 王国玉[1] KANG Yazhuo;ZHAO Xing′an;WU Qin;HUANG Biao;WANG Guoyu(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《排灌机械工程学报》2020年第5期462-468,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51839001,51679005,91752105);博士后创新人才支持计划资助项目(BX201700126);中国博士后科学基金资助项目(2017M620043);北京市自然科学基金资助项目(3172029)。

摘　　要：为了研究液体火箭发动机诱导轮非定常空化流动特性以及流场压力脉动特性,采用基于旋转曲率修正的湍流模型对诱导轮空化特性进行了数值计算,并与试验数据进行对比.结果表明:数值计算与试验测量的诱导轮扬程系数最大误差为3.6%,二者吻合较好.针对典型工况下的诱导轮非定常空化流动数值计算结果表明:空泡主要分布在叶片前缘和叶片进口轮缘处,每个叶片上的空泡形态大小不一,并且随着时间的推移各叶片空泡形态不断变化;在整个旋转周期中,回流涡空化旋转方向与诱导轮旋转方向一致,但旋转速度远小于诱导轮转速;诱导轮进口压力脉动主要受叶片旋转影响,在叶轮转频的倍频处,功率谱密度分布均有明显的峰值;诱导轮出口截面压力较高,压力波动相对较小.To analyze unsteady cavitating flow and its static pressure pulsation characteristics in the inducer of turbo-pump,the cavitation characteristics of an inducer were numerically predicted based on the turbulence model with rotation and streamline curvature corrections and compared with the experimental results.The maximum error of head coefficient between prediction and measurement is 3.6%,suggesting excellent agreement with the experimental results.The numerical results show that cavitating bubbles are mainly distributed at the leading edge of blade near the tip in the inducer under typical operating conditions and the cavity pattern varies from one blade to another continuously with time.Du-ring one rotating cycle,the vortex cavitation rotates with the inducer in the same direction at a far less rotating speed than that of inducer.The analysis of pressure fluctuation characteristics shows that the inlet pressure fluctuation in the inducer is mainly affected by blade rotation and the power spectral density distribution exhibits significant peaks at blade passing frequency.The pressure at the exitof inducer is higher but its fluctuation amplitude is relatively small.

关 键 词：火箭发动机 诱导轮 空化特性 旋转曲率修正 数值预测 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]