摘要
实验研究了环形燃烧室中的轴向脉冲爆震现象,结合高频动态压力测量以及尾部高速摄影,对轴向脉冲爆震模态的工作过程进行了分析。实验结果表明,对于氢气与空气混合物,当出口阻塞比大于或等于0.6且出口最小截面积处的质量通量大于200kg/(m^2·s)时,燃烧室出现轴向传播的爆震波;爆震波在每个周期内将经历解耦与重新起爆的过程,出口截面反射的激波在燃烧室头部发展成为爆震波,并伴随剧烈发光现象。爆震波在周期内的平均传播速度与燃烧产物声速相当,采用线性声学理论可以对该模态下的工作频率进行较好的预测。
The longitudinal pulse detonation phenomenon (LPD) in the annular combustor is experimentally studied, and the operation process of this mode is analyzed through the combination of the high frequency dynamic pressure measurement and the high speed imaging. The results show that for the hydrogen and air mixtures, the LPD occurs under the condition that the blockage ratio at the exit is larger than or equal to 0.6 and the air mass flux at the minimal cross-sectional area is greater than 200kg/(m^2·s). The LPD in the combustor undergoes decoupling and re-initiation in each cycle, and the shock wave reflected from the exit develops into a detonation at the head of the combustor, accompanied by severe luminescence. The average propagation velocity of the detonation wave in each cycle is comparable to the sound speed of the combustion products, which leads to the usage of the linear acoustic theory to predict the operation frequency.
作者
马虎
谢宗齐
邓利
薛赛男
周长省
Ma Hu;Xie Zongqi;Deng Li;Xue Sainan;Zhou Changsheng(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing210094,China;Beijing Aerospace Technology Institute,Beijing100074,China)
出处
《实验流体力学》
EI
CAS
CSCD
北大核心
2019年第4期33-38,64,共7页
Journal of Experiments in Fluid Mechanics
基金
国家自然科学基金项目(51606100)
航天科技创新基金资助项目
中央高校基本科研业务费专项资金项目(309171B8806)
关键词
旋转爆震发动机
轴向脉冲爆震
出口阻塞比
空气质量通量
工作频率
rotating detonation engine
longitudinal pulse detonation
blockage ratio
air mass flux
operation frequency