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为了研究泵在零或接近零净正吸程的条件下抽吸流体时其入口管中蒸汽与混合物的容积比而开展了这项研究。在这项研究中,假定泵的入口管中为一元、热力平衡的、以及液汽混合均匀的流体。本文还将研究结果与试验回路中用能够产生流动的“动力(Workhorse)”泵在液氢中进行试验研究所获得的结果进行了比较。这些试验使用了两种质量流量,其温度范围为36°—42°R(20.0—23.3K)。试验所得的结果与分析研究所得的结果之间的一致性表明,蒸汽与混合物的容积比能够相当精确地预示出来,它取决于进口管入口处流体的温度,质量流量,以及总压与蒸汽压之差。在使用前面报导的结果时,其估算的蒸汽与混合物的容积比可以用来预计在两相流中工作的泵诱导轮的性能。
This study was conducted in order to investigate the volumetric ratio of steam to mixture in the inlet pipe of a pump as it pulls fluid at zero or near zero net positive suction. In this study, it is assumed that the inlet pipe of the pump is a unitary, thermodynamically balanced, and liquid-vapor mixed fluid. The results of this study are also compared with those obtained from the experimental study of liquid hydrogen in a test circuit using a “Workhorse” pump capable of generating flow. These tests used two mass flow rates with a temperature range of 36 ° -42 ° R (20.0-23.3K). The agreement between the results of the tests and those obtained from the analytical studies shows that the volumetric ratio of steam to mixture can be fairly accurately predicted depending on the temperature of the fluid at the inlet of the inlet tube, the mass flow, and the relationship between the total pressure and the vapor pressure Difference. Using the previously reported results, the estimated steam to mixture volume ratio can be used to predict the performance of a pump inducer operating in a two-phase flow.