空气动力学学报Issue(3)：330-337,8.DOI:10.7638/kqdlxxb-2014.0106
真实气体效应对升力体舵面局部流动分离的影响
Investigation of real gas effects on local flow separation of lifting body rudder
摘要
Abstract
Flow separation occurs over the compression corners generated by deflected control surfaces on hypersonic vehicles.This phenomenon is coupled with shock/shock interactions, shock/boundary layer interactions and real gas effects.In order to design control surfaces of hy-personic vehicles and insure flight stability,it is important to predict this complex flowfield fea-tures on hypersonic vehicles.In this paper,a numerical study was conducted to assess the effects of real gas on the local flow separation of lifting body rudder.The effects of Mach number,wall temperature and flight altitude on separated flowfield features were highlighted.To this end, several numerical results derived for perfect gas,equilibrium gas and chemical nonequilibrium re-acting gas were provided and compared.The calculation results show that dissociation reaction occurs within boundary layer and reduces the temperature when real gas effects is considered. Viscosity of gas within boundary layer becomes smaller,the loss of kinetic energy decreases and this strengthens the ability to overcome the adverse pressure gradient,so the flow becomes har-der to separate.Real gas effects significantly decreases separation zone,and change the separa-tion/attach shock wave position and strength.As a result of shock/shock and shock/boundary layer interactions,pressure and heat flux distribution near the separation zone are changed by real gas effects at the same time.From the comparison of equilibrium gas and perfect gas result at dif-ferent altitude,a conclusion can be drawn that the flow separation becomes more sensitive to real gas effects at higher altitude. Wall temperature is an important factor to determine separatedflowfield features.As wall temperature increases,separation zone size becomes larger as well as heat flux on the rudder decreases.As Mach number increases,the separation zone size decreases and the differences between real gas and perfect gas become larger,real gas effects is more significant.关键词
真实气体效应/数值模拟/分离再附/高超声速/升力体Key words
real gas effects/numerical simulation/separation/attach/hypersonic/lifting body分类
航空航天引用本文复制引用
田浩,叶友达,蒋勤学,何先耀..真实气体效应对升力体舵面局部流动分离的影响[J].空气动力学学报,2015,(3):330-337,8.基金项目
国家自然科学基金重点项目 （）
