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通过改变燃料喷口周围空气喷口分布夹角,采用数值计算的方法研究了高温空气燃烧特性的变化,包括燃烧温度场、速度场和NOx的生成和出口排放情况。模拟结果说明,减小空气分布夹角可以降低燃烧区最高温度和平均温度,扩大燃烧室内低氧范围,有效抑制热力型NOx的生成和排放。所采用的计算模型和计算方法可以较好地模拟高温空气燃烧过程,计算结果可信。
By changing the angle of the air nozzle around the fuel nozzle, the combustion characteristics of the high temperature air including the combustion temperature field, the velocity field and the NOx emission and discharge were studied numerically. Simulation results show that reducing the angle of air distribution can reduce the maximum temperature and average temperature in the combustion zone, expand the range of low oxygen in the combustion chamber and effectively suppress the generation and emission of thermal NOx. The calculation model and calculation method adopted can simulate the combustion process of high temperature air well and the calculation result is credible.