超细水雾抑制瓦斯燃烧火焰的实验研究

摘要

通过搭建模拟回采工作面小尺寸实验平台,利用改造后的家用燃气灶作为燃烧器,研究了可燃预混气体火焰在超细水雾作用下火焰的变化过程,并测得了超细水雾作用于火焰过程中火焰的温度.通过改变通风速度和超细水雾的雾化速率,揭示了可燃预混气体在超细水雾氛围中火焰与温度的变化规律.通过建立稳定火焰面的力和速度平衡,找出了火焰形状拉伸扭曲的原因是破坏了火焰外焰和热气层交界面上力和速度的平衡;在其他条件一定的情况下,向模拟工作面上施加超细水雾后,火焰周围流场扰动明显增大,与在单独通风条件下相比,火焰温度跳动变化幅度和频率增大;%By building a small size experimental platform of simulation working face,using the gas range after reconstruction as gas burner,the study was taking on the changing process of the flammable premixed flame in ultra-fine water mist and measured the flame temperature.By changing the ventilation speed and the atomizing rate for ultra-fine water mist,the study could reveal the rule of the flammable premixed flame temperature variation in the ultra-fine water mist.By establishing the force balance and speed balance on the stable flame and analyzing the flame shape tensile distortion,it is found that the force and speed balance is destroyed on the surface layer between outer flame and heat layer.Under the same conditions,after joining the ultra-fine water mist in the simulate working face,the flow field disturbances increased obviously around flame in comparison with the only ventilated condition,and the flame temperature changes increased amplitude and frequency.In the conditions of mist concentration,the greater ventilated speed is,the stronger mixed gas is disturbed,the change of the temperature is greater,flame is more unstable.Experimental results show that ultra-fine water mist can restrain gas flame combustion.