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为了研究等离子体火炬喷射频率对超声速燃烧特性的影响,采用实验方法研究了超声速气流中等离子体火炬的点火及助燃特性。在单次喷射能量保持不变的情况下等离子体火炬喷射频率呈现两种不同状态,使得超声速燃烧特性也呈现出两种截然不同的燃烧模态。燃烧模态转捩过程中伴随有正规反射向马赫反射的转化过程。等离子体火炬对处于亚燃模态的燃烧场不起作用,对处于早期超燃模态的燃烧场产生燃烧促进作用,并可以促发燃烧场由早期超燃模态向亚燃模态的转捩。
In order to study the influence of the plasma torch injection frequency on the supersonic combustion characteristics, the ignition and the combustion-supporting characteristics of the plasma torch in the supersonic airflow were studied experimentally. The plasma torch injection frequency assumes two different states with a single injection of energy remaining constant, so that the supersonic combustion characteristics also exhibit two distinct combustion modes. The conversion process of normal reflection to Mach reflection is accompanied by the combustion mode transition. The plasma torch has no effect on the combustion field in the sub-combustion mode, which promotes combustion in the combustion field in the early stage of the super-combustion mode and can promote the transition of the combustion field from the early stage to the sub-combustion mode捩.