该文以单兵火箭冲击射流流场为研究对象，采用数值模拟技术，对定向器管尾附近区域的燃气流场进行了数值计算，给出了发动机工作早期阶段冲击射流噪声场形成过程的计算结果。
Taking the impact jet flow field of individual rocket as research object, this paper calculates the jet flow field near the back of the launching tube by using the numerical simulation method.
首先要镗孔，然后安装尾轴管，接下来装炮铜或白合金制的轴承套，也叫轴承。
First you need the boring for the shaft, then install the stern tube into the stern frame, next fit the gun-metal or white-metal bush.
当料浆的自然压力大于塑料管的耐压值后，便可使塑料管破管，从而使生产中断，浪费大量水泥、尾砂，并造成井下污染。
When the pressure is greater than the standard of the plastic pipe, the pipe will break, slurry and cement will escape from the pipe and pollute the mine.
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