该文针对发散冷却中由于结构本身的缺陷或者是局部大热流而引起的传热恶化问题,通过对烧结多孔壁面发散冷却过程进行数值模拟,对孔隙及热流的非均匀性对发散冷却壁面温度分布的影响进行了分析。结果表明:在一定的条件下,结构上的缺陷、堵塞或者局部大热流能引发局部高温,并发生冷却失效;恶化的扩散可导致发散冷却的失败;影响恶化的温度梯度的主要因素有多孔颗粒的材料、注入率、冷却剂以及壁面所承受的热量。该文针对局部高温或大热流所引发的冷却失效,提出了通过非均匀孔隙率及改变颗粒直径的办法来预防冷却失效的产生和扩散。 Aiming at the problem of heat transfer deterioration caused by the defects of the structure or the local large heat flux in the divergent cooling, the numerical simulation of the divergent cooling process on the sintered porous wall is carried out. The effects of the heterogeneity of pore and heat flow on the distribution of the cooling wall temperature distribution The impact of the analysis. The results show that under certain conditions, structural defects, clogging or local large heat flux can cause local high temperature and cause cooling failure. The worsening diffusion can lead to the failure of divergent cooling. The main factors that affect the temperature gradient are porous particles Material, injection rate, coolant and the amount of heat the wall is exposed to. Aiming at the cooling failure caused by local high temperature or large heat flux, the paper proposes to prevent the generation and diffusion of cooling failure by means of non-uniform porosity and changing the particle diameter.