In this short letter, we report an experimental investigation on the integration of film cooling for thermal protection in a 72-mm cylindrical rotating detonation engine (RDE). The cooling scheme involves injection of cooling air through a series of cat-ear-shaped film cooling holes densely distributed along the outer wall of the cylindrical combustor. Our findings reveal the successful initiation of the RDE and sustained propagation of the rotating detonation wave (RDW) when film cooling is activated, and the outflow reaches a supersonic state. Experimental observations corroborate the numerical simulations, indicating a lateral expansion tendency of the cooling jet under the influence of the high-frequency RDW.

中文翻译：

---

气膜冷却旋转爆震发动机实验验证

在这封简短的信中，我们报告了一项关于在 72 毫米圆柱形旋转爆震发动机 (RDE) 中集成薄膜冷却热保护的实验研究。冷却方案包括通过沿圆柱形燃烧室外壁密集分布的一系列猫耳形气膜冷却孔喷射冷却空气。我们的研究结果表明，当激活气膜冷却时，RDE 成功启动，旋转爆震波 (RDW) 持续传播，并且流出达到超音速状态。实验观察证实了数值模拟，表明冷却射流在高频 RDW 的影响下存在横向膨胀趋势。