Journal of Propulsion Technology ›› 2021, Vol. 42 ›› Issue (4): 931-940.DOI: 10.13675/j.cnki.tjjs.200268

• Application Basis of Detonation Propulsion Technology • Previous Articles     Next Articles

Flow Characteristics of Rotating Detonation Engine Inlet under Typical Operating Condition

  

  1. 1.College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;2.NEIAS Commercial Aircraft Company,Nanjing 210016,China
  • Online:2021-04-15 Published:2021-04-15

典型工况下旋转爆震发动机进气道流动特性研究

王卫星1,张仁涛2,李宥晨1,罗龙康1   

  1. 1.南京航空航天大学 能源与动力学院,江苏 南京 210016;2.中航工业南京机电科技有限公司,江苏 南京 210016
  • 基金资助:
    国家自然科学基金(11502111);航空动力基金(6141B09050341)。

Abstract: Rotating detonation engine is a new type of propulsion system with great potential. In order to analyze the effects of high frequency and ultra-high pressure circumferential pressure pulsation in the combustor on the flow characteristics of the inlet diffuser, the three-dimensional steady/unsteady numerical simulation method is used to study the flow characteristics of the inlet diffuser of the rotating detonation engine. The results show that under the influence of rotating detonation wave in the downstream combustor, there is a spiral moving shock propagating upstream in the diffuser. With the moving shock propagating upstream, its intensity and propagation velocity decrease, and the shock shape evolves from normal shock to oblique shock with the moving shock evolving into standing shock gradually. The flow separation zone induced by moving shock/boundary layer interaction gradually extends to the wave front and the relative thickness of the subsonic region before moving shock increases gradually in the relative coordinate system with the moving shock propagating upstream. Compared with steady condition,the total temperature and static temperature are higher and the total pressure is lower at the outlet under rotating detonation condition.

Key words: Supersonic inlet;Rotating detonation;Moving shock;Shock-boundary layer interactions;Numerical simulation

摘要: 为了分析旋转爆震发动机燃烧室高频超高压周向压力脉动对进气道扩张段流动特征的影响,采用三维定常/非定常数值仿真方法对旋转爆震发动机进气道扩张段流动特性开展研究。研究结果表明:受下游燃烧室旋转爆震波影响,扩张段内存在呈螺旋状向上游传播的运动激波;运动激波向上游传播过程中强度衰减、传播速度下降,激波形态由类正激波向类斜激波演化,运动激波逐步向驻激波演变,运动激波/边界层干扰诱发的回流区逐步向波前扩展,波面坐标系下波前亚声区相对厚度逐渐增大;与定常反压状态相比,旋转爆震工作状态进气道出口静温、总温较高,总压较低。

关键词: 超声速进气道;旋转爆震;运动激波;激波-边界层干扰;数值仿真