【摘要】 本文就喷管上游加入“声激振”对喷流流动特性的影响进行了机理性实验研究 ,得出在不同声激振参数和喷流工况条件下的喷流参数变化规律及相应的流动显示图象。实验结果表明 ,一定的声激振能量可引起喷流核心区长度缩短 ,掺混宽度增加 ,并对外界空气增大引射掺混。这一机理对于飞行器引射增力器增加推力和降低喷管壁面温度、改善喷流红外辐射强度分布有很好作用更多还原

【Abstract】 The mechanism of acoustically excited jet flow has been investigated experimentally.The variation rule of jet parameters was derived from various operating conditions of jets excited by different acoustical wave parameters.The flow-visualization images were obtained.The result indicated that the length of jet core section was decreased,the width of mixing section was increased,and the ambient air was entrained strongly by the jet due to the pulsed jet with acoustic waves.These effects are beneficial to the augmentation of ejector thrust and to decreasing of temperature on the nozzle wall,also to the distribution of infrared radiation intensity.更多还原