双吸泵输送含沙水流时蜗壳内压力脉动特性  

Pressure fluctuation features of sand particle-laden water flow in volute of double-suction centrifugal pump

作　　者：程效锐[1,2] 张楠[1,2] 赵伟国[1,2] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《排灌机械工程学报》2015年第1期37-42,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51269011);甘肃省自然科学基金资助项目(2011GS04252)

摘　　要：为了研究含沙水流下单级双吸式离心泵蜗壳内压力脉动的变化规律,采用ASMM固液两相流模型和RNG k-ε湍流模型,并结合SIMPLEC算法,在固液两相流介质时对泵内流动进行了全流道三维非定常数值计算.分析不同固相体积分数和粒径时,泵蜗壳内压力脉动的变化规律,并将固相体积分数=12%、固相粒径d=0.050 mm时的计算结果与输送清水介质时计算结果进行了对比.结果表明:固液两相介质下的压力脉动远大于清水介质,且脉动波形滞后0.002s;随着固相体积分数的增大,蜗壳内压力脉动幅值逐渐增大;随着固相粒径的增大,压力脉动幅值有减小的趋势;蜗壳内压力脉动主要以叶片通过频率为主,且在1倍叶频处压力脉动最大.In order to study fluid pressure fluctuation features in the volute of a centrifugal pump under solid-liquid two-phase flow conditions,a series of unsteady,three-dimensional,turbulent,sand particle-laden water flows in a single-stage double-suction centrifugal pump are simulatedBased on the ASMM solid-liquid two-phase flow model and SIMPLEC algorithm as well as the RNG k-ε two-equation turbulence model.The pressure fluctuations are characterized at various solid volume fractions and sand particle diameters;additionally,the simulated results of two-phase flow with 12% solid phase volume fraction and 0.05 mm particle diameter are compared with those of water alone.The results show that the pressure fluctuation of solid-liquid two-phase flow is much greater than the water single phase flow,and the pulse waveform of the two-phase flow is with 0.002 s lag.The pressure fluctuation rises with the increasing solid phase volume fraction,but the change in fluctuation amplitude is not significant.Also,the fluctuation is reduced with the increasing particle diameter.Compared with particlediameter,the solid volume fraction affects the pressure fluctuation more remarkable than the particle diameter does.The blade passing frequency is dominated in the pressure fluctuations in the volute,further the maximum pressure fluctuation occurs at the double blade passing frequency.

关 键 词：单级双吸离心泵 固液两相流 非定常流动 压力脉动 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]