定容燃烧弹内压力振荡机理研究

Pressure Oscillation in a Constant Volume Bomb

本文基于一种具有较好发展前景的醚类汽油添加剂异丙醚(DIPE),在定容燃烧弹内研究了该燃料在不同初始压力下随当量比变化的压力振荡特性。实验结果表明,压力振荡强度随当量比增加呈先增大后减小的趋势,且在当量比1.4附近达到最大值;随初始压力增大,压力振荡的强度也增强。本文通过利用He和CO_(2)以不同掺混比替代N_(2)作为稀释气体,验证了定容燃烧弹内的压力振荡主要由压力波与火焰相互影响引起,火焰自加速和混合气能量密度对压力振荡有至关重要的作用。

The pressure oscillation characteristics of a promising gasoline additive Di-isopropyl Ether(DIPE)were studied in a Constant Volume Bomb(CVB)under different experimental conditions.The results show that the pressure oscillation intensity increases with the initial pressure increases,the pressure oscillation intensity first increases and then decreases with increasing of the equivalent ratio,it reaches the maximum value near the equivalent ratio of 1.4.In this paper,by using He and CO_(2) to replace N_(2) as dilution gas with different blending ratios,it is induced that the pressure oscillation in the constant volume combustion bomb is mainly caused by the interaction between pressure wave and flame.The self-acceleration of flame and the energy density of the mixture played an important role in pressure oscillation.