关键词: MTPS蜂窝夹芯结构, 全灰体, 温度场, 灰度, 热应力

Abstract:

In this article, the steady state thermal field and heat stress in metal honeycomb core structures in metal thermal protection structures (MTPS) is analyzed. The coupled influence of two heat transfer forms of thermal conduction and radiation is taken into consideration, and a model of the honeycomb core structure is set up according to the assumption of the whole grey property of all the faces of the structure. By applying the principle of steady-state thermal flux conservation, a non-linear integral equation of the temperature filed in the honeycomb core is derived, whose solution is obtained by numerical method. The calculated data agree well with those obtained by NASA's Langley Research Center in its honeycomb structure experiment. Then the article discusses the impact of the emissivity of the slenderness ratio of honeycomb and the lower face of the sandwich plate on the thermal field of the structure under the boundary condition of given plate temperatures. Finally, by using the temperature field, the thermal stress of the honeycomb core in the steady state is analyzed by an approximate model.

Key words: honeycomb core structure of MTPS, whole grey body, temperature field, emissivity, thermal stress