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1前言脉冲管制冷机已基本达到了实用化的程度.但在理论方面,仍有较多问题存在,其中双向进气型脉冲管制冷机内的环流问题成为一个讨论的热点和难点.1991年朱绍伟进行双向进气方案的实验验证时［1］,已经提到了环流问题,即进出双向阀门的流量不等造成的冷端温度...“,”This paper introduces the results about DC flow and second orifice. In analysis, it isfound that direct current flow (DC flow) through double-inlet valve in pulse tube refrigeratoris not zero generally) and the DC flow direction may change when pressure wave changes.For one-order sinusoidal wave, the net DC direction is from hot end of pulse tube to coldend; but if second-order sinusoidal wave existing, the net DC flow direction may be changed.During experiments, through measuring the change of temperature, author found thatthe net DC flow direction in pulse tube is from pulse tube cold tip to hot end (opposite togenerally condition). Then second orifice is arranged from second-stage reservoir to highpressure pipe of compressor. Through experiments, second orifice is revealed to be effectiveto lower the temperature to a certain extent. This scheme is proposed for the first time.