疏导热防护的冷却机制（The cooling mechanism of thermal protection）.docVIP

疏导热防护的冷却机制（The cooling mechanism of thermal protection） The cooling mechanism of the thermal protection Jiang guiqing aibangcheng yu jijun China academy of space aerodynamics Solid medium fast transmission channel is an important mechanism of thermal protection, but the existing in solid medium high heat flow gradient area will appear negative net heat flux reversal phenomenon, this phenomenon can be called to the blocking effect of transmission, it will seriously affect the high heat flow temperature to the low heat flow zone temperature fast delivery. This paper proposes two solutions, can effectively solve the problem of the flow of negative net heat conduction block, one is to increase the coefficient of thermal conductivity of solid medium, the other is to use high temperature heat pipe cooling, the numerical simulation of the two solutions to solve the congestion problem to transfer the validity of the numerical simulation of some regularity results is given. 0 the introduction Channel type thermal protection is a new concept of thermal protection mechanism, with the traditional ablative thermal protection mechanism is different, it is not depend on the mass loss of heat protection material, to prevent the decalescence of hot material or other chemical reaction heat to achieve the purpose of withstand severe aerodynamic heating, but the heat radiation heat transfer, insulation layer material and the physical mechanism of high heat flux heat rapid transfer to low heat flux region, in order to reduce the surface temperature of high heat flow area, in order to achieve the level of the existing high temperature resistant material to withstand, so as to realize the true sense of the ablation. Numerical simulation shows that: in the aircraft head high thermal gradient area has a take-home pay close attention to the physical phenomenon: in the high gradient area surface heat flow into the material inside the net heat flux of the negative heat flow reversal phenomenon