Gas dynamic resonance performance of coaxial injector
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摘要: 为了研究环形喷嘴的气动谐振加热性能,采用高精度高分辨率的NND格式差分求解二维轴对称雷诺平均Navier-Stokes方程,对环形喷嘴-谐振管系统气动谐振加热过程中谐振管内振荡流动过程进行了数值仿真,并对不同面积的环形喷嘴-谐振管系统进行了数值模拟.研究结果表明:环形喷嘴与圆喷嘴具有相似的谐振加热规律和流场特征,即利用环形喷嘴同样可在谐振管内产生强烈的高频激波振荡.随着环形喷嘴面积减小,每一个谐振周期中的谐振温升逐渐减小.而其能够产生强烈谐振的间距小于圆喷嘴-谐振管系统的间距,在小间距时可以在很宽的喷嘴入口压力范围内产生强烈的谐振,这为气动谐振点火器的结构小型化和工程实用性提供了理论依据.Abstract: In order to study gas dynamic resonance performance of coaxial injector, high precision and high resolution NND scheme was used to solve Reynolds averaged Navier-Stokes equations. Numerical simulation was used to study process of oscillatory flow in different coaxial injector-resonance tube system. Flow field structure and character were obtained. It is obvious that coaxial injector and circle injector have similar resonance heating rules and flow field character. And resonance heating temperature decrease in every resonance cycle when the areas of coaxial injector reduce. The coaxial injector-s distance range between injector and resonance tube where intense resonance will occur is shorter than that of circle injector, and inlet pressure range of coaxial injector is wider than that of circle injector.
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Key words:
- gas dynamic /
- resonance /
- simulation /
- ignition
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