点火能量等因素对脉冲爆震室压的影响实验

Experimental investigation of the effects of ignition energy on pressures in a pulse detonation combustor

关键词:  点火参数  爆压  脉动式喷气发动机  脉冲爆震发动机  模型试验

Key words:  Ignition parameter  Detonation pressure  Pulsejet detonation engine  Pulse detonation engine  Model test

摘要:

以汽油 /空气两相混气为可爆混合物 ,采用汽油机点火系统和半导体高能点火系统 ,实验研究了不同点火频率对脉冲爆震室中不同位置脉冲爆震波压力的影响。结果发现 ,充满度大 ,产生的紊流强度大 ,有利于爆震波的形成 ;在大多数情况下 ,用低能量 (5 0mJ)的点火系统点火时 ,点火频率大于实际产生的爆震频率 ;用高能(1J)点火系统时 ,可缩短从爆燃向爆震转变 (DDT)的距离 ,易产生爆震 ,所得爆震波的峰值压力明显增大。所得结果可为脉冲爆震发动机的设计、爆震点火系统选型提供重要参考

Abstract:

The experimental investigation was carried out for the effects of ignition energy and filling degree on pressures in different locations along pulse detonation combustor in a PDE model under different ignition frequencies In PDE model fueled by air/gasoline the conditions for obtaining fully developed detonations were sufficient ignition energy and filling degree Two different types of ignition systems were employed.The experimental results show that the ignition energy and filling degree have considerable influence on detonation initiation With low energy plug, pulse detonation frequency was often less than ignition frequency Whereas the high energy igniter can make deflagration to detonation transition shorter, and every ignition can successfully trigger a detonation with higher peak pressure In addition, detonation occurrence varying with filling degree--over filled, critically filled or half filled was studied The higher filling degree,the higher filling velocity resulted in higher turbulence,and it can promote fully developed detonation