论文部分内容阅读
采用纹影系统、压力传感器和高速相机对甲烷-空气预混气体在定容燃烧弹中的燃烧特性进行研究,分析了当量比对拉伸火焰传播速度、未拉伸火焰传播速度和层流燃烧速度的影响及定容弹中压力的变化规律。结果表明,当量比对预混气体燃烧过程有重要影响,且存在临界当量比1.1,在临界当量比下预混气体燃烧最剧烈,层流燃烧速度达到最大值(0.368 m/s),燃烧压力也达到峰值(0.703 MPa)。当预混气体当量比小于临界值时,拉伸火焰传播速度、未拉伸火焰传播速度、层流燃烧速度和燃烧压力随当量比增加而增加;而当预混气体当量比大于临界值时,速度和压力随当量比增加而减小。
The combustion characteristics of methane-air premixed gas in constant volume combustion bombs were studied by using a smear system, a pressure sensor and a high speed camera. The effects of equivalence ratio on the propagation speed of tensile flame, the velocity of unstretched flame and the laminar flow The influence of speed and the change law of the pressure in the bomb. The results show that the equivalence ratio has an important influence on the combustion process of the premixed gas, and there is a critical equivalence ratio of 1.1. Under the critical equivalence ratio, the premixed gas combusts most intensely, and the laminar combustion velocity reaches the maximum (0.368 m / s) Also reached its peak (0.703 MPa). When the premixed gas equivalence ratio is less than the critical value, the propagation velocity of the flame, the velocity of the unstretched flame, the laminar flow velocity and the combustion pressure increase with the equivalence ratio. When the equivalence ratio of the premixed gas is larger than the critical value, Speed and pressure decrease with equivalent ratio increase.