煤油／空气吸气式脉冲爆震发动机试验研究

在内径50mm的吸气式无阀脉冲爆震发动机模型机上，以煤油为燃料，空气为氧化剂，成功进行了两相脉冲爆震试验。研究了煤油／空气推进剂的点火、起爆过程与特点，发现燃油粒度对PDE的点火-起爆影响至关重要。粒度较小时无论煤油是否加温均可成功生成爆震；而提高燃油温度有利于煤油的快速点火和加速火焰传播速度，但在燃油粒度较大时没有生成爆震。与汽油／空气推进剂相比，煤油／空气PDE起爆难度较大，且点火-起爆时间显著增加；随着频率增加，两者的点火-起爆时间差值逐渐减小。

Experimental investigation on a kerosene/air air-breathing pulse detonation engine

This paper focuses on investigating the ignition and detonation-initiation performance of kerosene/air based on an air-breathing two-phase valveless pulse detonation engine （PDE） with inner diameter of 50ram. A flash vaporization system was used to heat the kerosene and to observe the effect of fuel temperature on ignition-detonation performance of PDE. And the centrifugal nozzle and air-assisted atomizer were used to investigate the fuel droplet size effect on detonation-initiation performance. The results indicated that increasing ignition energy and fuel temperature were helpful for quick ignition and flame acceleration although detonation didn＇ t occur when the centrifugal nozzle was used. When air-assisted atomizer was used, detonation was initiated successfully no matter the fuel was heated or not. However, the ignition-detonation time of kerosene/air in air-breathing PDE at several operation frequencies was longer than that of gasoline/air respectively.