液体火箭发动机涡轮泵管式扩压器时序效应数值研究  

Numerical Investigation of the Clocking Effect of Pipe Diffuser in the Turbopump of Liquid Rocket Engine

作　　者：杨玉冰 毛凯[2] 卜学兵 丛红钏 孙中国[1] 席光[1] YANG Yubing;MAO Kai;BU Xuebing;CONG Hongchuan;SUN Zhongguo;XI Guang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安航天动力研究所,西安710100

出　　处：《西安交通大学学报》2024年第8期185-195,共11页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51922085)

摘　　要：为分析管式扩压器的时序效应对高速涡轮泵性能以及压力脉动的影响并阐明其影响机制,对某液体火箭发动机高速涡轮泵全流域进行三维定常和非定常数值计算,研究了管式扩压器时序效应对涡轮泵外特性的影响规律,采用熵产理论对涡轮泵内部的能量损失进行分析,并通过压力脉动均方根方法对涡轮泵内的压力脉动进行评估。结果表明:随着管式扩压器叶片与蜗壳隔舌夹角的增大,涡轮泵效率和扬程整体趋势均为先升高后降低,两者的变化幅度分别为0.75%、1.68%,当管式扩压器叶片吸力面出口边与蜗壳隔舌的夹角为20.5°、25.5°时,涡轮泵具有较好的性能,其影响机制由蜗壳隔舌下方的扩压管出口附近涡流和能量损失变化决定。动静干涉效应是涡轮泵内压力脉动的主要原因,时序效应对涡轮泵出口和蜗壳隔舌附近压力脉动的变化幅度分别为37.7%、67.6%。蜗壳流道内压力脉动的最大值位于蜗壳隔舌下方扩压管出口区域,时序效应对压力脉动最大值的变化幅度为20.5%。研究结果可为液体火箭发动机涡轮泵性能和振动的优化提供一定的参考。To analyze the influence of clocking effect of pipe diffusers on the performance and pressure pulsation of high-speed turbopumps and elucidate the influencing mechanism,this paper conducts three-dimensional steady and unsteady numerical calculations of the entire flow field of a high-speed turbopump in a liquid rocket engine.The study investigates the influence of clocking effect of a pipe diffuser on the external characteristics of the turbopump,analyzes the energy loss inside the turbopump using the entropy production theory,and evaluates the level of pressure pulsation inside the turbopump using the root mean square(RMS)method.The results show that with an increase in the angle between the pipe diffuser blades and the volute tongue,the overall efficiency and head of the turbopump first increase and then decrease,with amplitudes of variations of 0.75% and 1.68%,respectively.The turbopump exhibits better performance when the angle between the suction side exit of the pipe diffuser blades and the volute tongue is 20.5°and 25.5°.The influencing mechanism is determined by the variation of vortices and energy losses near the exit of the expansion pipe below the volute tongue.The rotor-stator interference effect is the main cause of pressure pulsation inside the turbopump,and the clocking effect respectively has impacts of 37.7% and 67.6% on the pressure fluctuation at the turbopump outlet and near the volute tongue.The outlet region of the expansion pipe below the volute tongue exhibits the maximum value of pressure pulsation in the volute flow passage,and the influence of the clocking effect on the maximum value of pressure pulsation is 20.5%.The findings of this study provide references for optimizing the performance and vibration of turbopumps in liquid rocket engines.

关 键 词：液体火箭发动机 涡轮泵 管式扩压器 时序效应 

分 类 号：V434[航空宇航科学与技术—航空宇航推进理论与工程]