中尺度管道内瓦斯爆燃压力火焰传播特性初步研究

Experimental study on flame propagation characteristics of gas explosion pressure in medium scale pipeline

以华北科技学院瓦斯爆炸实验室为实验平台,自行研制了一套火焰信号采集系统,对瓦斯爆燃过程中的前驱冲击波和火焰传播特性进行了研究。在相同的初始条件下分别进行了破膜和固壁反射两种工况下的压力火焰传播特性实验。结果表明:爆炸激波管反射端不同的边界约束,较弱的膜片(类似于泄爆膜片)和固壁(强约束)对冲击波和火焰的反射作用效果不同,根据超压大小,可判断膜片泄爆可更好地减小冲击波峰值和持续时间。火焰面宽度和速度有不可重复性特征,说明了中尺度管道爆燃火焰呈现了湍流不稳定性,也验证了DDT过程是非定常的。

Based on North China Institute of Science and Technology explosion lab platform, A set of flame signal acquisition system is developed by ourselves. The precursor shock wave and flame propagation characteristics in gas explosion were studied. Under the same initial conditions, the breaking film and the solid wall reflection and flame propagation were carried out. Results show： The different boundary constraints of the reflection end of the shock tube, the weaker diaphragm （strong constraint） are different from the reflection of （similar to the the shock wave sure, the peak value and duration of the shock wave can be reduced venting diaphragm） and and flame, According to by using the diaphragm the solid wall the overpres- bursting. The flame width and speed are not repeatable features, the mesoscale pipeline deflagration presents turbulence instability, It also verifies that the DDT process is not constant.