Experimental Study On Heat Transfer Characteristics Of Low-flow Resistance Kerosene Under Supercritical Pressure

Thermal protection issues have always been an important factor limiting the development of scramjet engines.At present,the regenerative active cooling technology is the most effective solution to the thermal protection problem,that is,the engine fuel acts both as a propellant and as a coolant.The super-combustion ramjet has a very high thermal load and requires a high mass flow of fuel to meet the cooling demand,which means that the fuel has a high flow rate in the cooling passage.However,the high flow rate causes the flow resistance of the fuel in the cooling passage to be large,so the concept of reducing the kerosene is proposed to reduce the flow resistance,thereby reducing the pressure in the cooling passage and the power of the oil pump.Reduced-resistance kerosene is a newly proposed hydrocarbon fuel,and its heat transfer characteristics are still insufficiently studied.Therefore,an experimental study on the heat transfer characteristics of reduced-resistance kerosene has been carried out.In the background of research on regenerative active cooling technology,this experiment draws on the experience and achievements of experimental research on the heat transfer characteristics of hydrocarbon fuels,designs experimental schemes,builds experimental platform,and uses the experimental platform to simulate the process of cooling the engine by reducing the resistance of kerosene.Under the experimental conditions of experimental system pressure 10 MPa,15 MPa,fuel flow rate 20 m/s,40m/s,60m/s,heating heat flux 0~35 MW/m~2,the reduction of kerosene M-3 under supercritical pressure The heat sink and heat transfer characteristics of M-30 and space kerosene M were experimentally studied.The experimental results show that under supercritical pressure,the higher the fuel flow rate,the smaller the heat sink of the reduced resistance kerosene and the space kerosene;the greater the heating heat flux density,the greater the heat sink of the reduced resistance kerosene and the space kerosene;the pressure on the resistance kerosene and The impact of the heat sink of space kerosene is minimal.Under supercritical pressure,the greater the flow rate,the greater the heat transfer coefficient of the reduced resistance kerosene and the space kerosene,and the stronger the heat exchange capacity.The greater the heating heat flux density,the greater the heat transfer coefficient of the reduced resistance kerosene and the space kerosene,and the stronger the heat exchange capacity.Compared with the analysis of reduced resistance kerosene and aerospace kerosene,the heat sink and heat transfer capacity of the reduced resistance kerosene are lower than that of the space kerosene.Therefore,as a coolant for the scramjet engine,although the kerosene can significantly reduce the flow resistance,its heat exchange cooling capacity is lower than that of the space kerosene.