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通过积分方法，对柱塞与缸孔间的特殊环形缝隙流道的层流流量公式进行了分析与推导，总结得 到计算公式，方便了柱塞泵（马达）的设计。
Through the integral method, the laminar flow formula of the special annular gap flow passage between the plunger and the cylinder bore is analyzed and deduced. The formulas are obtained and the design of the plunger pump (motor) is facilitated.