摘要
对超音速空气喷射器的性能进行了试验和数值研究,得到了喷射器的喷射器系数,并分析了不同进气参数下的喷射器内部压力场和马赫场。结果表明,喷射系数的计算值和试验值吻合的较好,偏差小于5%;随着进气压力逐渐下降,引射驱动力减小,喷射系数降低。此外,高压气体在工作喷嘴出口的膨胀程度随进气压力降低而逐渐减弱,激波链出现的位置和强度也随之变化;进气压力降低使得高压气体在工作喷嘴的膨胀越充分,达到的马赫数越大,但是当进气压力降低为0.01MPa时,混合室的主体段由超音速或音速流动转变为亚音速流动,在混合室出口未形成激波。
The experimental and numerical research on the supersonic air ejector is carried out. The entrainment ratio,static pressure and Mach number distributions in the ejector are obtained at various operating parameters. The results indicated that, a good agreement between the experiments and simulations was obtained with the discrepancy within 5%,and the entrainment ratio decreases with the secondary air pressure. Moreover,the expansion position and intensity of shock wave are influenced by the secondary air pressure. The mavh numbers in the injector increase with the decreasing of the secondary air pressure ,and the flow in the mixing chamber is supersonic or sonic. But when the secondary air pressure is 0.01MPa,the flow in the mixing chamber changes to subsonic ,which leads to no shock wave at the exit of the mixing chamber.
出处
《机械设计与制造》
北大核心
2016年第8期111-113,117,共4页
Machinery Design & Manufacture
关键词
喷射器
喷射系数
激波
马赫数
Ejector
Entrainment Ratio
Shock Wave
Mach Number
