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采用冷态试验和数值模拟相结合的方法研究半预混燃烧器空气燃气速度比、燃气喷口位置以及气体预热温度对燃烧室中气体混合特性的影响。冷态试验采用示踪气体法;数值模拟利用组分输出模型。研究表明,增加空气/燃气速度比使燃烧器内部燃气浓度分布更均匀,燃烧器内同一水平截面中纵向燃气浓度峰值随空气/燃气速度比增加而逐渐向燃烧器壁面移动;燃气喷口设置在气流分配装置前的混合效果要优于设置在气流分配装置后的燃气喷口;空气预热温度增加使燃烧器内部燃气浓度分布更均匀。
The effects of air-gas velocity ratio, gas jet position and gas preheating temperature on the gas mixing characteristics in the combustion chamber were studied by the combination of cold test and numerical simulation. Tracer gas method was used in cold test; component output model was used in numerical simulation. The results show that increasing the air / gas velocity ratio makes the distribution of gas concentration in the burner more uniform. The vertical gas concentration peak in the same horizontal section of the burner gradually moves toward the burner wall with the increase of air / gas velocity ratio. The mixing effect before the distribution device is better than that of the gas nozzle arranged behind the airflow distribution device. The air preheating temperature increases to make the gas concentration distribution inside the burner more uniform.