吸气式连续旋转爆震与来流相互作用

Interaction of air-breathing continuous rotating detonation with inflow

以加热空气为氧化剂,氢气为燃料,开展了吸气式连续旋转爆震试验,研究了连续旋转爆震与来流的相互作用。通过测量隔离段和爆震燃烧室压力,发现了3种相互作用类型:类型1:连续旋转爆震对空气来流不产生影响;类型2:空气来流中存在高频压力振荡,且主频与连续旋转爆震波的传播频率相同,但来流总压不变;类型3:空气来流中存在与连续旋转爆震波传播频率相同的高频压力振荡,且来流总压升高。初步对比了爆震燃烧室尺寸的影响,结果表明随着爆震燃烧室面积的减小,连续旋转爆震对来流的影响增强,影响区域也向上游扩展。

Experiments on continuous rotating detonation（CRD）in the air-breathing mode were performed,and vitiated air and hydrogen were used as oxidizer and fuel,respectively.The pressures in the isolator and detonation combustor are acquired,and three types of interactions of the CRD with the air flow are found.In Type 1,the air flow in the isolator is not affected by the CRD,and neither high-frequency pressure oscillation in the isolator,nor total pressure rise of the air flow is excited.In Type 2,the CRD leads to high-frequency oscillation in the isolator and its dominant frequency is the same as the CRD;the total pressure of the air flow remains constant.In Type 3,the pressure in the isolator oscillates with the same high-frequency of the CRD and the total pressure of the air flow is increased.The influence of the detonation combustor size is preliminarily investigated and results show that the CRD strengthens as the detonation combustor size decreases,and the influence of the CRD propagates towards upstream.