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为了研究微尺度超声速喷管的推进性能,采用无滑移的连续介质模型,对二维和三维微尺度拉伐尔喷管的冷态流场进行数值模拟。对不同算例的模拟结果进行比较,给出二维微喷管对几何结构和工作条件的要求,结果表明,在绝大部分工作条件下,20°扩张角是较好的外形设计选择;对三维和二维模拟结果进行比较,给出二维微喷管对蚀刻深度的要求,结果表明,蚀刻深度和喷管喉部宽度的比值超过10时,微喷管具备很好的二维特性。
In order to study the propulsion performance of microscale supersonic nozzles, the non-slip continuum model is used to simulate the flow field in two-dimensional and three-dimensional microscale Laval nozzles. The simulation results of different examples are compared and the requirements of two-dimensional micro-nozzle for geometry and working conditions are given. The results show that under most working conditions, 20 ° divergence angle is a better choice of shape design. Dimensional and two-dimensional simulation results are compared to give the two-dimensional micro-nozzle depth of the etching requirements, the results show that the nozzle depth and nozzle throat width ratio of more than 10, the micro-nozzle with good two-dimensional characteristics.