Effect of subharmonic forcing on transition in chemically reactive shear-layers

Aerothermodynamic heating loads on reentry vehicles are increased by shear-layer/boundary layer development, and the design of the thermal protection system depend critically on the ability of predicting transition. Supersonic shear-layers form in the windward region of the vehicles due to shock-shock interactions near the engine leading edge or in the leeward region of blunt body capsules near the separation region. In either cases, transition affects the thermal load at the impingement of the shear-layer with solid surfaces. Carbon chemistry is important for planetary reentry, given the large concentration of carbon dioxide in the Mars and Venus atmosphere. Carbon chemistry also affects the development of fine scale mixing in cavity stabilized supersonic combustors, where shear-layers are formed between the air stream and the burnt gas recirculating in the cavity.

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