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在离心泵中有一些液体从高压腔向低压腔漏洩。通常在设计泵时,只考虑漏洩对理论压头(考虑叶轮出口的径向速度)以及对泵的容积效率的影响。但漏洩可能会大大地影响泵的水力损失和泵的圆盘摩擦损失。漏洩对圆盘摩擦损失的影响在于漏洩使叶轮圆盘和壳体壁间的间隙发生漏洩流(单级泵中——由叶轮外围向中心流;多级泵中——由叶轮后盘中心向外围流)。
Some liquid in the centrifugal pump leaks from the high pressure chamber to the low pressure chamber. When designing a pump, it is common to consider only the effects of leakage on the theoretical head pressure (taking into account the radial velocity of the impeller exit) and the volumetric efficiency of the pump. However, leakage can greatly affect pump hydraulic losses and pump disc friction losses. Leakage on the disk friction loss is due to leakage leakage between the impeller disc and the shell wall leakage occurred (single-stage pump - from the impeller periphery to the center flow; multi-stage pump - by the impeller rear disc center to Peripheral flow).