Double suction centrifugal pump has characteristics of large flow rate and high head.It is widely used in agricultural irrigation and water delivery and other projects.The volute and the impeller in double suction pump have rotor-stator interaction.The match between the two will have an impact on the hydraulic performance of double suction centrifugal pump.Therefore,it is very important to study the matching relationship between the volute and the impeller.The CFD numerical simulation was combined with the experimental data.By studying the impact on the hydraulic performance with different specific speeds,the optimal volute area ratio and its regular pattern were obtained.The findings were as follows:when the volute area ratio was increased,the maximum efficiency point was shifted to the large flow rate.The head and efficiency were decreased,and the average efficiency of the high efficiency area was reduced.When the area ratio was reduced,the head and efficiency were increased in a certain range,and the maximum efficiency point was moved to the small flow condition.However,when it was reduced to a certain extent,the head and efficiency showed a rapid decline.Finally,based on the summary of the optimal volute area ratio of the double suction pump with different specific speeds,it was found that with the increase of the specific speed,the optimal volute area ratio was increased,and the range of the high efficiency area was widened gradually.The results provided a reference for the reasonable selection of the volute area ratio in double suction centrifugal pump and improved the hydraulic performance of double suction pump.%双吸离心泵具有流量大、扬程高的特点,被广泛应用于农业输水灌溉等工程.双吸泵的蜗壳和叶轮间具有动静干涉作用,两者之间的匹配形式会对水泵的水力性能产生影响.将CFD数值模拟和已有试验数据相结合,通过研究不同比转数的双吸离心泵蜗壳面积比对水力性能的影响,得出不同比转数下双吸离心泵最优蜗壳面积比规律.研究发现,当蜗壳面积比在原有基础上增加时,其最高效率点向大流量工况偏移,且扬程和效率有下降的趋势,设计工况附近的平均效率降低;当蜗壳面积比减小时,其在一定范围内扬程和效率均出现上升,最高效率点偏向于小流量工况,但是当降低到一定程度时,扬程和效率均会出现急剧的下降,最终通过总结各个比转数双吸泵的最优蜗壳面积比,得到随着比转数的增加,最优蜗壳面积比增加,高效区范围逐渐加宽这一规律.
展开▼
