中文摘要：

在这篇论文， DSMC 和 Navier 司烧计算途径被使用学习微嘴流动。微嘴流动领域和推进性能上的入口状况，墙边界条件，雷纳兹数字，微嘴几何学和 Knudsen 数字的效果详细被学习。在在考虑下面的 Knudsen 数字范围以内，两个都，方法工作在微嘴内预言流动特征，这被发现。连续统方法与滑动边界条件在在嘴内模仿界面层的形成显示出好性能。在嘴出口嘴唇区域，然而， DSMC 方法由于煤气的快速的扩大更好。它与减少被发现那入口压力，连续统模型之间的差别和 DSMC 结果由于提高的变成稀薄效果增加。有增加雷纳兹的卸料系数和戳效率增加数。戳与嘴宽度几乎成正比。与扩大的尺寸，当变成稀薄效果将有点被削弱时，嘴表演变得更好。

英文摘要：

In this paper, both DSMC and Navier-Stokes computational approaches were applied to study micronozzle flow. The effects of inlet condition, wall boundary condition, Reynolds number, micronozzle geometry and Knudsen number on the micronozzle flow field and propulsion performance were studied in detail. It is found that within the Knudsen number range under consideration, both the methods work to predict flow characteristics inside micronozzles. The continuum method with slip boundary conditions has shown good performance in simulating the formation of a boundary layer inside the nozzle. However, in the nozzle exit lip region, the DSMC method is better due to gas rapid expansion. It is found that with decreasing the inlet pressure, the difference between the continuum model and DSMC results increases due to the enhanced rarefaction effect. The coefficient of discharge and the thrust efficiency increase with increasing the Reynolds number. Thrust is almost proportional to the nozzle width. With dimension enlarged, the nozzle performance becomes better while the rarefaction effects would be somewhat weakened.