红外与激光工程, 2017, 46 (2): 0239004, 网络出版: 2017-03-31  

封闭空间中火焰-冲击波相互作用及缸内压力波动现象分析

Experimental study of flame-shock wave interaction and cylinder pressure oscillation in confined space
作者单位
1 天津大学 内燃机燃烧学国家重点实验室, 天津 300072
2 天津内燃机研究所, 天津 300072
摘要
研究了在自主设计的带孔板新型的定容燃烧弹中, 采用氢气-空气作为燃料, 得到不同强度的加速火焰和冲击波, 证明了湍流火焰和冲击波的相互作用。利用高速纹影技术捕捉经过孔板之后产生的湍流火焰前锋和超声速传播的冲击波。分析孔径、孔隙率对火焰传播速度、冲击波强度以及缸内压力波动强度的影响规律。发现在一定的初始条件下, 层流火焰经过孔板加速会产生清晰的冲击波, 反射冲击波与火焰相互作用, 会使得火焰发生往复传播。此时的缸内压力也会出现较大幅度的波动。这种火焰与冲击波的相互作用机理被认为是导致缸内压力大幅波动的原因。该研究为小型强化汽油机爆震现象的研究提供借鉴, 也为DDT和脉冲爆轰现象的研究提供了一种新方法。
Abstract
Experiments were conducted in a newly designed constant volume combustion bomb with orifice plate by varying initial conditions. Hydrogen-air mixtures were used to obtained the turbulent flame front and shock wave, as well as the processes of flame-shock interactions were tracked by high-speed schlieren photography. The effects of apertures, porosities, equivalence ratios and distance between spark and orifice plate on the flame propagation speed, the intensity of shock wave and their interactions to pressure oscillation were analyzed in detail. It was found that there formed a clear shock wave after laminar flame passing through orifice plate under certain conditions.The reflected shock wave interacted with the flame front, which causes oscillating flame propagation. On the other hand, the cylinder pressure presents a violent fluctuation. It was indicated that the interaction between flame and shock wave was the reason of pressure oscillation. This work provides a references for the study of knock in SI engines and shows a method for DDT and pulse detonation phenomena research as well.

高东志, 卫海桥, 周磊, 刘丽娜, 赵健福, 徐在龙. 封闭空间中火焰-冲击波相互作用及缸内压力波动现象分析[J]. 红外与激光工程, 2017, 46(2): 0239004. Gao Dongzhi, Wei Haiqiao, Zhou Lei, Liu Lina, Zhao Jianfu, Xu Zailong. Experimental study of flame-shock wave interaction and cylinder pressure oscillation in confined space[J]. Infrared and Laser Engineering, 2017, 46(2): 0239004.

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