Experimental Investigation of Transpiration Cooling With Phase Change on Ceramic Matrix Composites
The use of lightweight high-temperature resistant ceramic matrix composites and phase change coolants are two important development directions of transpiration cooling.however,the research on the combination of the two is relatively insufficient.In this paper,the phase change transpiration cooling of C/C-SiC ceramic matrix composites was experimentally studied in a su-personic wind tunnel,and the influence of composites pore structure on the transpiration cooling performance was analyzed.The results show that in ceramic matrix composites plates,the un-even distribution of the pore structure aggravates the vapor-blockage effect,resulting in local high temperature in the plate,which is hardly eliminated with the increase of injection ratio.For ma-terials with relatively uniform pore structure,the cooling efficiency and uniformity are significantly improved.Compared with metal sintered porous materials,ceramic matrix composites have lower permeability and thermal conductivity,resulting in lower phase change ratio and lower cooling ef-ficiency.In the future,it is necessary to continue to study the optimization method of the pore structure to further improve the efficiency and uniformity of phase change transpiration cooling with composites.
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