摘要
为探究叶片出口梯形切割对离心泵蜗壳流激噪声的影响,以一台比转速为66的单级单吸离心泵为对象,通过定义切割宽度系数δ与径向高度系数γ,设计了9种切割方案。基于RNG k-ε湍流模型对离心泵进行全三维非定常数值模拟,在此基础上采用边界元法(boundary element method,BEM)计算内场噪声,采用结构有限元法(finite element method,FEM)耦合声学边界元方法计算外场流激噪声;分析不同切割方案下离心泵水力特性和噪声幅射特性,经试验方法验证数值计算的准确性。研究表明:动静干涉是离心泵蜗壳流激噪声产生的主要原因,合理的叶片出口梯形切割能使离心泵水力性能基本稳定的同时有效降低动静干涉强度及蜗壳流激噪声水平;声学性能最优切割方案,叶频处的进、出口监测点声压级分别下降13%和7.5%,外场噪声监测点声压级下降2.4%。
Here,to explore effects of trapezoidal cutting at blade outlet on volute flow-induced noise of centrifugal pump,a single-stage single-suction centrifugal pump with the specific speed of 66 was taken as the study object,by defining cutting width coefficientδand radial height coefficientγ,9 cutting schemes were designed.Based on RNG k-εturbulence model,fully 3-D unsteady numerical simulation was performed for the centrifugal pump.Then,the boundary element method(BEM)was used to calculate internal field noise,and the finite element method(FEM)coupled with acoustic BEM was used to calculate flow-induced noise in external field.Hydraulic characteristics and noise radiation characteristics of centrifugal pump under different cutting schemes were analyzed,and tests were conducted to verify the correctness of numerical calculation.The results showed that rotor-stator interaction is the main reason for flow-induced noise of centrifugal pump volute appearing;reasonable blade outlet trapezoidal cutting can make hydraulic performance of centrifugal pump basically stable,and effectively reduce intensity of rotor-stator interaction and level of flow-induced noise of volute;after adopting the cutting scheme with the optimal acoustic performance,sound pressure levels at inlet and outlet monitoring points on blade-frequencies reduce by 13%and 7.5%,respectively,and sound pressure levels at outfield noise monitoring points reduce by 2.4%.
作者
郭荣
李小兵
刘向
李天鹏
GUO Rong;LI Xiaobing;LIU Xiang;LI Tianpeng(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Provincial Key Lab of Fluid Machinery and Systems,Lanzhou 730050,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第13期82-91,共10页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(52009050)
甘肃省自然科学基金资助项目(20JR10RA172)
中国博士后科学基金资助项目(2020M673537)。
关键词
离心泵
梯形切割
动静干涉
压力脉动
声振耦合
centrifugal pump
trapezoidal cutting
rotor-stator interaction
pressure fluctuation
acoustic-vibration coupling
