混流泵内流场压力脉动特性研究  

Pressure Fluctuation of Interior Flow in Mixed-flow Pump

作　　者：靳栓宝[1] 王永生[1] 常书平[1] 苏永生[1] 

机构地区：[1]海军工程大学动力工程学院,武汉430033

出　　处：《农业机械学报》2013年第3期64-68,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51009142)

摘　　要：基于RANS方程和SST湍流模型,应用SIMPLEC算法,对混流泵内流场进行非定常数值模拟,分析了不同流量工况和不同转速工况时混流泵内4个代表性监测面上压力脉动的时域和频域特性。取非定常计算的功率平均值与试验值对比,证明该数值模型可较准确描述泵内流场特征。结果表明:混流泵内最大压力脉动在叶轮进口,从轮毂到轮缘脉动幅值递增;在叶轮进口和叶轮出口压力脉动频率主要为叶轮叶频,而导叶中间和导叶出口压力脉动频率与流量工况相关;偏离最优工况越远脉动越大,偏小流量对叶轮进口压力脉动影响明显;不同转速时最优工况压力脉动频率成分相似,脉动幅值随转速增加而增加。The unsteady flow in a mixed-flow pump was simulated based on RANS solver embedded with SST turbulence model and SIMPLEC algorithm. The time-domain and frequency-domain of pressure fluctuations at four representative monitoring surfaces under different flow rate and rotational speed conditions were analyzed. Comparison between averaged calculated power and test data verified that interior flow simulated by this numerical model was relatively accurate. The numerical results showed that the maximum pressure fluctuation appeared at impeller inlet where the pressure fluctuation amplitude increased from hub to shroud. The dominant frequency at impeller inlet and impeller outlet was the impeller blade passing frequency, but the dominant frequency at middle and outlet of the stator was correlative with the flow rate. The pressure fluctuation became stronger as deviating from the optimum flow rate, especially at impeller inlet when small flow rate conditions. The optimum flow rate conditions of different rotational speed had a similar dominant frequency of pressure fluctuation, the pressure fluctuation amplitude increased with the rotational speed increasing

关 键 词：混流泵 压力脉动 非定常流场 数值模拟 

分 类 号：TH313[机械工程—机械制造及自动化]