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首页> 外文会议>ASME Joint U.S.-European Fluids Engineering Conference >SUPER-FINE STRUCTURE IN THE CRITICAL FLOW-RATE OF CRITICAL FLOW VENTURI NOZZLES
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SUPER-FINE STRUCTURE IN THE CRITICAL FLOW-RATE OF CRITICAL FLOW VENTURI NOZZLES

机译：临界流动术口喷嘴的临界流速的超细结构

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摘要

It is shown that critical flow Venturi nozzles need time intervals, i.e., more than five hours, to achieve steady state conditions. During these intervals, the discharge coefficient varies gradually to reach a value inherent to the pressure ratio applied. When a nozzle is suddenly put in the critical condition, its discharge coefficient is trapped at a certain value then afterwards approaches gradually to the inherent value. Primary calibrations are considered to have measured the trapped discharge coefficient, whereas nozzles in applications, where a constant pressure ratio is applied for a long time, have a discharge coefficient inherent to the pressure ratio; inherent and trapped coefficients can differ by 0.03-0.04%.
机译：结果表明，临界流动文丘里管喷嘴需要时间间隔，即超过五个小时，以实现稳态条件。在这些间隔期间，放电系数逐渐变化以达到所施加的压力比固有的值。当喷嘴突然处于临界状态时，其放电系数被捕获在一定的值，然后之后逐渐接近固有值。主要校准被认为已经测量了捕获的放电系数，而应用中的垂直压力比长时间的应用中的喷嘴具有固有的压力比固有的放电系数;固有和捕获的系数可以差异0.03-0.04％。

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