脉冲爆震发动机的点火-起爆性能

Ignition-Detonation Performance of Pulse Detonation Engines

针对两相无阀脉冲爆震发动机(PDE),研究了点火能量、工作频率、发动机直径、进气方式和燃料种类等对PDE点火-起爆性能的影响.结果显示,随着点火能量的提高,点火-起爆时间逐渐减小.随着PDE工作频率的提高,点火-起爆时间逐渐减小;但是点火能量对PDE点火-起爆时间的影响随着工作频率的提高而有所降低.随着PDE直径的增加,点火-起爆时间有所增加.火箭式PDE点火-起爆时间略低于对应工况下的吸气式PDE.采用煤油为燃料的PDE点火-起爆时间略高于采用汽油的PDE点火-起爆时间,且随着PDE工作频率的提高,两者差距逐渐缩小.

The ignition-detonation performance of two-phase valveless pulse detonation engines （PDEs） with the inner diameters of 50 mm and 120 mm in different operation eases was investigated. To quantify the ignition and detonation-initiation performance, ignition-detonation time was examined, which was defined as the sum of ignition time and deflagration-todetonation transition （DDT） time. In order to study the effects of ignition energy, operation frequency of PDE, inner diameter of PDE and fuel type on ignition-detonation time and PDE performance, the proof-of-principle experiments of PDEs were carried out. The results indicated that ignition-detonation time decreased with the increase of ignition energy. As operation frequency increased, ignition-detonation time decreased and the effect of ignition energy on ignition-detonation time decreased. Ignition-detonation time increased as PDE diameter increased. Each ignition-detonation time of gasoline-air in a pulse detonation rocket engine （PDRE） was slightly shorter than that of air-breathing PDE at the same operation frequency. Ignition-detonation time of kerosene/air in air-breathing PDE at several operation frequencies was slightly longer than that of gasoline/air.