Flow and Heat Transfer Characteristics of Supercritical N-Decane in Adjacent Cooling Channels with Opposite Flow Directions

To ensure the safety of a scramjet, an arrangement scheme adjacent regenerative cooling channels with opposite flow directions is adopted to decrease maximum wall temperature. Based on extended corresponding-state methods, and heat transfer characteristics supercritical n-decane in same under pressure 3 MPa are comprehensively investigated this paper. Compared direction, local temperature notably reduced. Moreover, effects flux gravity development field analysed. A pair recirculation zones found close bottom along scale which greatly expands increasing flux. Once density reaches critical value, phenomenon asymmetry occurs. In addition, small induced by buoyancy force narrow when remain same, effect could inhibit generation small-scale vortices asymmetry.