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超音速扩压器性能研究具有非常重要的工程实际应用价值。该文为加深对超音速风洞扩压器内流场结构的理解,采用Fluent软件对“收缩段等直段扩张段”型扩压器流场进行了数值计算,较好模拟了扩压器中由激波/边界层干扰诱导的复杂流场的流场特性,再现了流场中的“激波串”和“伪激波”现象,与文献结果吻合较好。并以比较精细的二维网格计算结果对激波串的形成机理和典型流动结构进行了分析,同时应用于实际工程,对某超音速风洞扩压器不同二喉道长度状态下的扩压效率进行了比较。
The study of supersonic diffuser performance has very important practical engineering value. In order to deepen the understanding of the flow field structure in supersonic wind tunnel diffuser, Fluent software is used to calculate the flow field of “straight section expansion section” such as contraction section. The simulation of diffuser The characteristics of the flow field in the complex flow field induced by the shock / boundary layer disturbances reproduce the phenomenon of “shock wave” and “pseudo shock” in the flow field, which is in good agreement with the literature results. The formation mechanism and the typical flow structure of the shock wave train are analyzed with the comparatively detailed two-dimensional grid calculation results. At the same time, it is applied to practical engineering. The expansion of a supersonic wind tunnel diffuser under different second throat length conditions Pressure efficiency is compared.