这个等式是其中一个最有用，因为它允许喷嘴出口速度计算。
This equation is one of the most useful, as it allows the nozzle exit velocity to be calculated.
通过数值计算，得到了喷嘴出口自由射流与冲击射流情况下的流体速度、压力等参数分布情况，及这两种流场中的激波位置。
Through the numerical simulation, the distribution of those parameters such as speed, pressure of the free jet and impinging jet flow is obtained, also the position of shocks.
对箱体设计进行外形及内部结构的改进后，箱体喷嘴出口的速度达到均匀。
Through improving the effects of the figuration and internal structure of box, the flow velocity of nozzle of water curtain system of box type is better even.
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