首级叶轮结构对多级泵效率影响的数值模拟

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为提高效率对D200-50（P）-0105a型节段式多级离心泵首级叶轮进行了改进设计，利用Fluent软件对改进前后首级叶轮的内部流场进行数值模拟．结果表明：原泵首级叶轮结构不合理导致运行效率不高，改进后首级叶轮流道内压力和速度分布均匀，叶轮内流动平稳，水力损失减少，提高了效率。对改进前后泵进行性能实验，对比性能曲线可知改进后泵性能优于改进前，原泵最高效率为63．5％．改进后泵效率为786％，达到了提高泵的效率的目的，数值模拟结果对多级泵的设计的改进提供了可靠依据。

First stage impeller of D2OO-50（P）-OlO5a multistage centrifugal pump got improvement redesigned in order to improve efficiency. By simulating the three-dimensional flow field in first stage impeller of before and after redesign by Fluent, the results show that the unreasonable impeller structure got pump low efficiency. Pressure and velocity distribution in first stage impeller after redesign is more uniform, the improvement design has the impeller flow more stable, decreases the hydraulic loss, which increases the efficiency. Contrast the performance curve of Performance experiment on before and after improved pumps we can get a conclusion that performance of improved pump is superior to before improvement. The original pump highest efficiency is 63.5%, and the improved pump efficiency get 78.6%. The purpose that increases the pump＇s efficiency of improvement design impeller has reached. Numerical simulation of multistage pump provides the reliable basis for pumps＇ design and improvement.

多级离心泵，首级叶轮，数值模拟，效率，multistage centrifugal pumps，first stage impeller，numerical simulation，efficiency。

首级叶轮结构对多级泵效率影响的数值模拟。