圆喷嘴气动谐振性能研究

对不同尺寸的圆喷嘴的自由射流尾迹的流场结构进行了分析,得到了激波位置随喷嘴直径以及喷嘴入口压力与环境压力之比的变化关系.其与圆柱形谐振管以及锥柱形谐振管组成的喷嘴-谐振管系统的数值模拟结果表明:喷嘴-谐振管系统能够产生强烈谐振的条件是谐振管入口的位置处于喷嘴自由射流流场的膨胀波区域内,若处于激波区内则无法产生谐振,与试验结果相吻合.通过对不同直径的喷嘴的谐振性能的比较,得到了最佳的喷嘴与谐振管的匹配. 

Gas dynamic resonance performance of circle injector

By means of analysis of the trailing flow field structure of different circle injectors,the relationship between the position of shock wave specific to injector diameter,and the pressure of inlet flow/pressure of environment was determined.From numerical simulation of circle injector with cylinder resonance tube and cone resonance tube,it is concluded that the necessary condition the intense resonance can occur within resonance tube lies in the position of resonance tube's entrance in the expand wave field;and if the position is in shock wave field,the resonance can not occur within resonance tube.Now the region where resonance occurs can be gained from free jet flow field by means of numerical simulation.The best matching between injector and resonance tube was obtained by analyzing the resonance heating performance variation with different diameter injectors.