两相多循环爆震波特性研究

为了研究两相爆震燃烧的特性,在多循环自吸式脉冲爆震原型机上进行试验研究.运用动态压力传感器和离子探针并行采集手段进行试验,结果表明:爆震波传播速度在1 300m/s左右;爆震波的前导激波与反应区之间的距离在30mm左右,两相爆震的主要反应区厚度约为80mm左右,且反应区后存在液滴的燃烧延迟;激波动态压力信号与反应区的离子信号的并行采集可以作为判断是否产生爆震的手段.

Investigation of two-phase and multi-cycle detonation

In order to study the two-phase detonation wave characteristics,a series of experiments at different frequencies were conducted on a pulse detonation engine(PDE) prototype,the diameter and the length of which are 58 mm and 1 370 mm respectively.The data of dynamic pressure and ion signal were collected simultaneously in the PDE combustion chamber.The PDE prototype can work at frequency up to 50 Hz with gasoline/air mixture.The two-phase and multi-cycle detonation wave characteristics were described firstly from combustion mechanism.The detonation wave propagated at about 1300m/s,and the width of induction zone is about 30mm.The reaction zone width is about 80mm,and behind the reaction zone there exists reaction delay of liquid fuel drops.Data simultaneous collection can be used to judge whether actual detonation in the PDE combustion chamber occurs.