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旋转流中预混合火焰高速传播特性的研究为强化低热值燃气的稳定燃烧提供了新的开发思路.针对圆管内强制涡作用下的甲烷/空气预混合火焰,本工作采用数值模拟方法分析了混合气的进口速度和旋转角速度对预混合火焰稳定燃烧的影响.结果表明,在不同当量比条件下,使火焰稳定的混合气进口速度和旋转角速度之间存在线性关系,但随着旋转角速度的增大,火焰半径变小,燃烧效率减小.改变混合气进口速度的分布形式是提高燃烧效率的有效方法.研究结果为实际的稳燃燃烧器设计提供了理论指导.
The research on the high speed propagation of premixed flames in a swirling flow provides a new idea of development for enhancing the stable combustion of low calorific value gas.For the methane / air premixed flame under forced vortex in a circular tube, this work uses numerical simulation to analyze the mixing Gas inlet velocity and rotational angular velocity on the combustion of premixed flame.The results show that there is a linear relationship between the inlet velocity of the flame and the rotational angular velocity at different equivalence ratio conditions.But with the increase of rotational angular velocity Large, the radius of the flame becomes smaller and the combustion efficiency decreases. Changing the distribution form of the inlet velocity of the mixture is an effective way to improve the combustion efficiency. The research results provide theoretical guidance for the design of practical steady-state combustion burners.