本文数值模拟喉部半高为34μm的二维微喷管,分别分析了固定进口及固定喉部尺度下扩张角、扩张比以及滑移边界条件对微喷管性能的影响,发现最佳半扩张角在20°～22°之间,而最佳扩张比为7.为了比较壁面滑移条件对计算结果影响,分别数值模拟了喉部尺寸为68μm和6.8 μm的微喷管,发现Kn＜0.001时,滑移边界条件对数值模拟结果较小;而0.002＜Kn＜0.045时,壁面滑移对流场和微喷口推力性能有较大影响.
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