氧化剂喷注面积对连续旋转爆轰波传播特性影响的实验研究

Experimental Research on Influence of Oxidant Injection Area on the Propagation Characteristics of Continuous Rotating Detonation Wave

为了研究氧化剂喷注面积对连续旋转爆轰波传播特性的影响,以H2为燃料、空气为氧化剂,在喷孔-环缝式连续旋转爆轰发动机上开展了一系列试验研究。基于燃烧室内高频压力信号和氧化剂集气腔内的压力信号,分析了氧化剂喷注面积对连续旋转爆轰波传播过程、速度亏损和稳定性以及爆轰波波头高度的影响。试验结果表明:当推进剂质量流量不变时,增大氧化剂喷注面积,爆轰波传播速度亏损增大,爆轰波稳定性变差,同时爆轰波波头高度减小;在氧化剂喷注面积为217. 1 mm2、当量比为0. 9时,爆轰波平均速度达到1 800 m/s,为理论Chapman-Jouguet速度的93%,同时爆轰波表现最为稳定;当氧化剂喷注面积不变时,随着当量比的增大,爆轰波传播的稳定性先升高、后降低。

A series of experimental study of continuous rotating detonation engine(CRDE)with orifice-slit injection mode,which utilizes H2as fuel and air as oxidant,were carried out to study the influence of oxidant injection area on the propagation characteristics of continuous rotating detonation wave.Based on the high-frequency pressure signal in the combustion chamber and the pressure signal in the oxidant chamber,the influence of oxidant injection area on the propagation,velocity loss,stability and wavefront height of detonation wave is analyzed in detail.The experimental results show that,when the mass flow rate of propellant remains constant,the loss of propagation velocity of detonation wave becomes larger,the stability of propagation velocity of detonation wave becomes worse,and the wavefront height of detonation wave decreases with the increase in oxidant injection area.When the oxidant injection area is217.1mm2and the equivalent ratio is0.9,the average velocity of detonation wave reaches1800m/s,which is93%of the theoretical Chapman-Jouguet(CJ)velocity,and the stability of detonation wave is also the best.When the oxidant injection area remains constant,the stability of detonation wave first increases and then decreases with the increase in equivalence ratio.