基于二阶统计量的推进泵空化激振源辨识  

Cavitation excitation source identification for propulsion pump based on second-order statistics

作　　者：赵国寿 曹琳琳[2] 吴大转[2] ZHAO Guoshou;CAO Linlin;WU Dazhuan(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;College of Energy Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]浙江大学能源工程学院,杭州310027

出　　处：《振动与冲击》2025年第5期88-96,175,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52171326)。

摘　　要：空化引起的载荷脉动是泵振动的主要根源,其激振源的辨识对于泵振动控制至关重要。针对某前置导叶非均匀尾流干扰引起的泵叶片空化开展了水洞试验与数值模拟研究,提出了基于二阶统计量的激振源辨识方法,该方法将具有物理因果关系的叶片载荷分布与整体受力相关联,结合模态分解可以有效揭示具有主导能量贡献度的泵叶片空化激振的载荷分布。结果表明,来流冲角时空特性对叶片空化发展和分布起主要的调控作用。带幅值的相关性模态能够表征能量贡献度,无量纲的相关性系数模态能够表征变量相似性。空化时,基于二阶统计量的激振源辨识发现整体叶片中部至根部均对推力脉动有较大贡献,受低频主导,而一阶统计量仅能提取前缘空化自身诱发的载荷脉动。Load pulsation caused by cavitation is the main source of pump vibration,and identification of pump excitation source is crucial for pump vibration control.Here,water tunnel tests and numerical simulation were conducted to investigate cavitation of pump blades caused by non-uniform wake interference of a certain front guide vane.A method for identifying excitation source based on second-order statistics was proposed,this method could relate load distribution of blades with physical causality relations to the overall thrust.Combined with modal decomposition,load distribution of cavitation induced vibration of pump blades with dominant energy contribution could be effectively revealed.The results showed that spatiotemporal characteristics of incoming flow incidence angle play a major regulatory role in development and distribution of blade cavitation;the correlation mode with amplitude can characterize energy contribution,while the dimensionless correlation coefficient mode can characterize the similarity of variables;during cavitation,identification of excitation source based on second-order statistics exhibits the entire blade from middle to root having larger contributions to thrust pulsation,they are dominated by low frequencies,while first-order statistics can only extract load pulsation induced by front edge cavitation itself.

关 键 词：泵空化 非均匀来流 相关性 模态分解 

分 类 号：TH312[机械工程—机械制造及自动化]