Numerical Investigation on the Heat Transfer of n-Decane in a Horizontal Channel with Axially Nonuniform Heat Flux under Supercritical Pressure

Regenerative cooling is considered promising in the thermal protection of hypersonic propulsion devices such as SCRamjet. However, heat transfer deterioration (HTD) hydrocarbon fuel a severe threat to structure safety, especially under axially nonuniform flux caused by load difference different components. In this work, trans-critical n-decane mini-horizontal channel numerically investigated. The influences on focused on. Two types HTD are recognized and analyzed. first type induced near-wall flow acceleration local thickening viscous sublayer. second closely related expansion low conductivity ? specific cp region, which seriously worsened flux, when peak locates where Tw ? Tpc. minimum HTC deteriorates 40.80% Tw_max increases from 857 K 1071 27.5%. maximum fluctuation pressure drop 6.8% variation distribution with ? = 2. This work expected offer reference proper match temperature engine boundary SCRamjet system design.