叶片不等间距对离心泵水动力噪声的影响  

Effect of Uneven Spacing Blade on Hydrodynamic Noise of Centrifugal Pump

作　　者：谈明高[1] 张景[1] 刘厚林[1] 王勇[1] 黄浩钦[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业机械学报》2016年第2期22-27,34,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：'十二五'国家科技支撑计划项目(2013BAF0102);江苏省科技支撑计划项目(BE2014879);江苏省'六大人才高峰'项目(ZBZZ-040);江苏省产学研项目(BY2014123-07);江苏高校优势学科建设工程项目(PAPD)

摘　　要：以一台六叶片单级单吸立式离心泵为研究对象,研究了叶片不等间距对离心泵流体诱导噪声的影响。首先基于转子自动平衡理论建立了3种叶片不等间距叶轮模型,并对模型泵全流场进行了CFD数值计算,以提取蜗壳及泄露流道壁面偶极子声源。通过振动试验与基于模态响应的振动计算结果对比,验证了模型泵振动噪声数值预测的可行性,并进一步借助直接边界元法完成了水动力噪声计算。对比叶片不等间距叶轮与原叶轮模型计算结果,分析表明:叶片不等间距布置后泵总声功率级与声压级频谱均整体明显降低,但各不等间距模型总声功率级差距较小,最大仅为0.5%;除原叶频及谐频处声压级峰值外,叶片不等间距模型在145 Hz及其谐频上产生了新的声压级峰值,噪声能量更分散,噪声频谱更平稳;最小角间距θmin=50°时模型更能兼顾叶频和145 Hz处辐射噪声特性,噪声性能更优。In order to analyze the effect of uneven spacing blade on the flow induced noise of centrifugal pump,a single-stage single-suction vertical centrifugal pump with six blades was chosen as the research object. Firstly,based on the theory of automatic rotor balance,three impeller models with uneven spacing blade were established,then with the purpose of extracting the dipole source of the wall of volute and leakage flow,the whole flow passage numerical simulation of model pumps was executed by applying CFD. The results of vibration simulation based on model response were compared with vibration experiment to verify the certain feasibility of NVH simulation,the simulation of hydrodynamic noise was further completed by applying BEM. The final work was to analyze the simulation results of the uneven spacing blade models and the original impeller model,the results showed that there were little differences in total SPL between uneven spacing blade models,which had lower total SPL and spectrum of SPL than original impeller model in general. New peaks of SPL were produced at 145 Hz and its harmonic frequency in uneven spacing blade models,except for the peaks of SPL at original blade frequency and its harmonic frequency,and the energy of noise was more disperse,the spectrum of noise was more stable.Compared with the other two models,the model with θminof 50° could do better when considering the blade frequency and the characteristics of exterior noise at 145 Hz,and it had better noise performance.The results of the research can provide reference for further optimization of the noise of centrifugal pump.

关 键 词：立式离心泵 振动噪声 叶片不等间距 

分 类 号：TH311[机械工程—机械制造及自动化] TB533.1[理学—物理]