摘要
超高速流动是飞行器再入大气层时所面临的高速高温流动环境,膨胀管是少数几种能模拟超高速流动的地面设备之一。采用数值模拟方法对超高速试验进行辅助分析诊断,流动模拟时热化学反应模型的选择对流场特性影响较大,分别选择5组分、11组分热平衡及5组分热非平衡模型,对比研究3种不同热化学反应模型对双楔试验模型数值模拟结果的影响,以进一步评估超高速流动模拟时热化学反应模型的适用范围。结果表明,试验气流条件下5组分化学模型即可满足要求,加速气流条件则必须采取11组分化学模型,而对于流动中热非平衡效应显著时,热化学非平衡模型更为适用。
Hypervelocity flow is the high-speed high-temperature flow environment that space vehicles or capsules face when they reenter the atmospheric layer. An expansion tube is one of the few qualified test facili- ties on the ground to simulate it. Numerical simulation is presented as a powerful assistant tool for hyperveloci- ty flow diagnosis and analysis. Thermal-chemical reaction model plays an important role in simulation of hyper- velocity flow. Thermal-chemical reaction models of 5 and 11 species based on thermal equilibrium condition, and 5 species based on thermal nonequilibrium condition are applied on the numerical technique. A compara- tive study of the influence on the computation for double-wedge test model employed with the above three mod- els has been conducted to evaluate their applicability. The results indicate that 5 species chemical model can meet the test gas simulation requirement, but 11 species chemical model must be taken into account for the ac- celeration gas. However, if the thermal nonequilibrium phenomenon is strong in the flow, we must employ the thermal-chemical nonequilibrium model to guarantee the reliability of the numerical simulation.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2017年第6期1173-1181,共9页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金(11532014)~~
关键词
超高速
膨胀管
数值模拟
热化学反应模型
适用范围
hypervelocity
expansion tube
numerical simulation
thermal-chemical reaction models
applicability
