Numerical Investigation of Multi-element Vitiated-air Heater for Scramjet Testing

摘要：

The scramjet experiment relies on combustion air pre- heaters to provide flight enthalpy simulation. The one-element heater has disadvantages of non-uniform flowfield at the exit plane and high temperature on the injection faceplate. In this paper, a mul-tielement heater (with seven coaxial injectors) was designed. Numerical simulation of the threedimensional reacting flow in multi-element heater had been carried out The two-equation shear stress transport k-ω turbulence model was used for modeling turbulence and eight-step finite-rate mechanism was used for modeling the H2/Air chemical kinetics. The results show that:(l) the uniformity of exit flowfield is improved significantly by using multi-element coaxial injectors, the temperature non-uniformity coefficient is decreased from 21％ to 8％, oxygen mole-fraction non-uniformity coefficient is decreased from 17％ to 1.4％;(2) the heat load of injection faceplate is improved, the highest wall temperature is 650k when L/R=0.65. The heater could operate for long time test without adding cooling system for the faceplate

关键词： scramjet heater injection model uniformity numerical simulation

作者: Chen Chaoqun Xu Xu

作者单位: of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191,China of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

会议类型: 国际会议

会议名称: 2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)

会议地点: 西安

会议语种:英文

页码: 439-443

在线出版日期: 2010-09-01（万方平台首次上网日期，不代表论文的发表时间）