流体机械2024，Vol.52Issue(6)：58-66,9.DOI:10.3969/j.issn.1005-0329.2024.06.008
微型高速燃油泵空化数值模拟与试验研究
Numerical simulation and experimental study on cavitation of micro high-speed fuel pump
摘要
Abstract
Based on SST k-ω turbulence model and ZGB cavitation model were used to numerically simulate the internal flow with and without cavitation under different operating conditions of a certain type of micro high-speed fuel pump.The vibration accelerations in X,Y,and Z directions under different working conditions and heights were collected,and the vibration characteristics with and without cavitation were analyzed.The results show that changes in flow rate,rotational speed,and height have a significant impact on the cavitation characteristics of micro high-speed fuel pumps.At rated speed,as the inlet pressure of the fuel pump decreases,cavitation first appears on the inside of the pump inlet elbow and the back of the impeller blade,further expanding to the entire impeller flow channel,which basically blocks the flow.The gas content in the impeller also increases from less than 5%to about 70%.In both simulation and visualization,the initial position of the bubble can be observed to be at the elbow,which then diffuses to the suction elbow and gradually increases,forming a clear gas-liquid boundary line and ultimately leading to complete flow interruption.When cavitation occurs,there is a significant vibration in each axial direction at twice the blade frequency,and the sequential increasing trend is Y,X,and Z axes.As the height increases,the degree of cavitation intensifies,and the vibration spectrum in all directions changes,with the maximum peak values all showing a decreasing trend,but triggering higher frequency vibration signals.The amplitude variation law of vibration power spectral density corresponds to the cavitation development degree,which can be used as the characterization of the cavitation degree in the pump.This study provides a theoretical basis for cavitation discrimination and cavitation flow control of micro high-speed fuel pumps.关键词
燃油泵/数值模拟/空化/振动Key words
fuel pump/numerical simulation/cavitation/vibration分类
机械制造引用本文复制引用
廉佳,王维军,王晓全,王新超,邹轶群,吴刚..微型高速燃油泵空化数值模拟与试验研究[J].流体机械,2024,52(6):58-66,9.基金项目
航空科学基金(2023M026151001) （2023M026151001）
流体机械及工程四川省重点实验室(西华大学)开放课题(szjj2019-029) （西华大学）
航空工业成都凯天电子股份有限公司预研项目(Y2049,Y2173) （Y2049,Y2173）
