The applicability of Mach number independence principle in case of hypersonic thermo-chemical nonequilibrium flow | |
Li K(李康); Li JP(李进平); Jiang ZL(姜宗林) | |
会议录名称 | Proceedings of the First International Conference on High Temperature Gas Dynamics |
2012-09 | |
会议名称 | First International Conference on High Temperature Gas Dynamics |
会议日期 | 2012 |
会议地点 | Beijing |
摘要 | Above a certain Mach number, several aerodynamic properties become asymptotically independent of the free stream Mach number, such as pressure coefficient, lift and wave-drag coefficients, and flow-field structure. Known as Mach number independence principle, this phenomenon is important for hypersonic flow analysis and hypersonic vehicle designs. Proceeding from the contents of Mach number independence principle, we numerically study the applicability of the law in thermo-chemical nonequilibrium flow by applying Navier-Stokes equation in a five-component system. Sphere-cylinder is chosen as simulation model with radius 5cm considering the double scale law and the free-stream is at H=60km. To study the effects of nonequilibrium flow, we compare it with frozen flow and thermal equilibrium flow. The flows are set as viscous or inviscid. For viscous flow, the wall boundaries are treated by assuming an adiabatic or isothermal wall for laminar flow. Wave-drag, lift and friction coefficient, boundary layer distribution, shock shapes and pressure distribution along the wall are given for several combinations of Mach number and gas states (frozen, thermal equilibrium and thermo-chemical nonequilibrium gas). For sphere-cylinder bodies considered here, Mach number independence principle only exists for wave-drag coefficient in the considering nonequilibrium flow due to the coupled effects of real-gas and expansion. |
关键词 | Keywords: Mach Number Independence Oswatitsch Nonequilibrium Flow Real-gas Effect Expansion Effect |
课题组名称 | LHD激波与爆轰物理 |
语种 | 英语 |
文献类型 | 会议论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/49544 |
专题 | 高温气体动力学国家重点实验室 |
推荐引用方式 GB/T 7714 | Li K,Li JP,Jiang ZL. The applicability of Mach number independence principle in case of hypersonic thermo-chemical nonequilibrium flow[C]Proceedings of the First International Conference on High Temperature Gas Dynamics,2012. |
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