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本文考虑粘度对离心泵基本公式中滑移系数、理论扬程的影响，对低比转速离心油泵叶轮出口直径进行了优化计算。研究表明，粘度对低比转速离心油泵的叶轮出口直径和机械效率影响很大。
In this paper, the influence of viscosity on the slip coefficient and theoretical lift in the basic formula of centrifugal pump is considered, and the outlet diameter of centrifugal impeller at low specific speed is optimized. Studies have shown that viscosity has a significant impact on the impeller exit diameter and mechanical efficiency of low specific speed centrifugal oil pumps.