Abstract

Rarefied gas flow into a vacuum through short linearly diverging and converging channels has been examined with the direct simulation Monte Carlo method. Solution to the problem has been suggested using complete geometric setup with quite large areas on inlet and outlet of a model channel in examined geometry. A mass flow rate through the channel and flow field both inside the channel and upstream and downstream have been calculated in a wide range of gas rarefaction. These calculation results are comparable to corresponding data for the channel with constant cross section. A strong impact of channel geometry and gas rarefaction has been proved.

中文翻译：

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变截面通道内稀薄气流的直接随机模拟

摘要

通过直接模拟蒙特卡罗方法检查了通过短的线性发散和会聚通道进入真空的稀薄气流。已建议使用完整的几何设置来解决该问题，在检查的几何形状中模型通道的入口和出口上具有相当大的面积。计算了大范围气体稀薄度下通过通道的质量流量以及通道内部及上下游的流场。这些计算结果与恒定横截面通道的相应数据相当。通道几何形状和气体稀薄度的强烈影响已被证明。