Research on Heat Transfer Performance of Liquid Metal-Hydrocarbon Fuel Double-Layer Cooling Channel on the Wall of Aero-Engine
At high Mach numbers,the cooling channels on the scramjet wall are susceptible to damage due to the influence of high heat flux density,leading to engine failure.Researching the cooling performance of wall cooling channels is beneficial for improving the phenomenon of uneven heating.Therefore,this paper proposes a double-layer cooling channel using liquid metal and hydrocarbon fuel.A flow and heat transfer test system of liquid metal was established to verify that the simulation has good accuracy.Simulation results show that the cracking reaction increases the total heat sink of the fuel while also aggravating the thermal stratification phenomenon within the channel.This is a dual effect brought by the cracking reaction of the dual-channel fuel,which is more prominent under high heat flux conditions.Compared with the single-channel of n-decane,the maximum of RT on the side of n-decane of dual-channel can be reduced from about 55%to about 18%,and the maximum of RH can be reduced from about 1000%to less than 100%.Compared with the single-channel of liquid metal,the maximum of RH on the side of liquid metal of dual-channel can be reduced from 230%to about 80%,indicating that the dual-channel structure effectively improves the uniformity of heat absorption by liquid metal within the channel.This study provides theoretical guidance for obtaining appropriate combustor wall cooling channel parameters for liquid metal cooling systems.
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