摘要
为解决某型发动机在耐久试验中冷却水泵发生汽蚀的问题,对叶轮进行改进设计以减小水泵的汽蚀余量。考虑叶轮出口直径、叶片包角、叶轮轮毂曲率半径、隔舌间隙等参数对水泵汽蚀余量的影响,结合流体仿真软件对叶轮改进前后的压力云图、隔舌区域流体冲击载荷分布、气泡体积分数进行对比,并将改进后的水泵再次进行耐久试验。仿真和试验表明,改进后水泵的汽蚀余量明显下降,水泵上没有明显汽蚀现象,证明改进后的水泵提高了抗汽蚀能力。
To solve the cavitaion occurred in the engine endurance test, an improvement design of the impeller is carried out to reduce the pump cavitation allowance. Considering the effect of the influence of impeller outlet diameter, blade wrapping angle, hub radius of curvature, tongue clearance and other parameters on pump cavitation allowance to NPSH, a series of data are contrasted and obvious decrease of changed pump NPSH can be achieved combined with fluid simulation software stress nephogram, every tongue area before and after the change velocity vector, and bubble volume fraction. The simulation and experiment shows that the pump has no cavitaion trace after endurance test once again which proves the improvement of its ability.
作者
徐超
孙传利
丰竹慧
XU Chao;SUN Chuanli;FENG Zhuhui(State Key Laboratory of Engine Reliability, Weifang 261061, China;Engine Research Institute,Weichai Power Co. , Ltd. , Weifang 261061, China)
出处
《内燃机与动力装置》
2019年第2期33-39,共7页
Internal Combustion Engine & Powerplant
关键词
冷却水泵
汽蚀
叶轮
仿真
cooling water pump
cavitation erosion
impeller
simulation
