Hypersonic Chemically Reacting Boundary-Layer Stability using LASTRAC

Kline, H L ; Chang, C-L

关键词: AERODYNAMIC BALANCE;    BOUNDARY LAYER TRANSITION;    BOUNDARY LAYER STABILITY;    HEAT TRANSFER;    HYPERSONIC BOUNDARY LAYER;    HYPERSONIC VEHICLES;    NONEQUILIBRIUM FLOW;    REENTRY EFFECTS;    THERMOCHEMISTRY;    CROSS FLOW;    ENDOTHERMIC REACTIONS;    IDEAL GAS;    MACH NUMBER;    STABILITY TESTS;    THERMOCHEMICAL PROPERTIES;   

RP-ID  :  NF1676L-28593

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Hypersonic boundary layer transition is critical to the design of all hypersonic vehicles due to its effect on the heat transfer into the vehicle surface and potential drag enhancement or reduction during reentry. Boundary layer transition and boundary layer stability analysis under hypersonic conditions has been studied for decades, yet there is ample room for improved accuracy and further investigations into the relevant phenomena. In this work, we present a recent implementation of chemical equilibrium, finite-rate chemistry, and thermochemical nonequilibrium capabilities into LASTRAC, an existing well-established boundary-layer stability analysis code. Verification against existing numerical results in the literature are presented. LASTRAC was previously able to address calorically perfect flows. By using solutions of the Parabolized Stability Equations (PSE) with chemical and thermal nonequilibrium, we are able to investigate the effects of chemical and thermal nonequilibrium on a variety of phenomena including stationary crossflow instability on a swept wing and 2nd mode instabilities over a wedge.