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因上游流速小于下游流速而导致管路中的液柱受拉分离达到一个足够长的时间时,管路的高位部分就会出现空化流。这种空化流表面为蒸汽压,它受阻力和重力的影响(对于倾斜管道而言)。整个空化区的蒸汽速度和蒸汽百分率为时间和距离的函数,它们可由提出的解析方程式求得。这些空化区仅当液体冲击引起凝结时才会减小。本文提出了求解激波面迎面压力升高和凝结速度的方程式。包括这些内容在内的程序,可以在几种边界条件下进行管系瞬变流计算。已对本方法与试验及其他方法作了比较。
Cavitation flow occurs in the upper part of the pipeline when the liquid column in the pipeline is pulled apart for a long enough time because the upstream flow velocity is less than the downstream flow velocity. This cavitation flow surface is vapor pressure, which is affected by resistance and gravity (for inclined pipes). The rate of steam and the percentage of steam throughout the cavitation zone are a function of time and distance and can be found from the analytical equations proposed. These cavitations only reduce when the liquid impact causes condensation. This paper presents an equation for solving the pressure rise and the condensation velocity on the shock wave surface. Programs that include these can be used to calculate pipe transient transients under several boundary conditions. This method has been compared with tests and other methods.