背风侧倾斜开孔的非均匀布局波纹隔热屏气膜冷却特性研究

To address the issue of low cooling efficiency at the crests of longitudinally corrugated heat shields， a novel structural—a non-uniformly distributed longitudinally corrugated heat shield with inclined perforations only on the leeward side of the troughs， was proposed. Using commercial CFD software and fluid-solid coupled numerical simulation methods，comparative studies were conducted with traditional structural schemes including uniformly distributed and graded-density configurations. The cooling performance of the heat shield's wall was analyzed under hole inclination angles ranging from 20° to 40° and blowing ratios between 0.82 and 1.85，and the effects of inclination angle and blowing ratio on cooling efficiency were examined. The results showed that the proposed design effectively utilized dynamic pressure intake on the leeward side， significantly reduced high-temperature zones on the wall，improved crest cooling efficiency，and enhanced wall temperature uniformity. A smaller inclination angle decreased trough cooling efficiency but increased crest cooling efficiency，with the crest cooling efficiency reaching its peak at an inclination angle of 30° to 35°，representing a 5.62% improvement compared with the baseline model. At a blowing ratio of 1.85， the maximum enhancement in crest cooling efficiency reached 5.57% compared with the baseline model，though accompanied by a 7.57% reduction in cooling efficiency uniformity coefficient.