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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.
In order to study the aerodynamic resonance heating performance of annular nozzle, a two-dimensional axial symmetric Reynolds-averaged Navier-Stokes equation was solved by using the high-precision and high-resolution NND differential method. The oscillatory flow in the resonant tube during the process of aerodynamic resonance heating of annular nozzle- The simulation results show that the annular nozzle and the circular nozzle have the same heating and heating characteristics and the characteristics of the flow field, that is, the annular nozzle can also be generated in the resonance tube Intense high-frequency shock oscillation.With the annular nozzle area decreases, the resonance temperature in each resonance period gradually decreases.While it can produce a strong resonance spacing is smaller than the circular nozzle-resonance tube system spacing, at small spacing It can produce a strong resonance in a wide nozzle inlet pressure range, which provides a theoretical basis for structural miniaturization and engineering practicability of a pneumatic resonant igniter.