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本文在径向浓淡旋流煤粉燃烧器模型实验台上，对直流二次风喷口扩角改变时射流的混合特性、扩展角、回流区、相对回流量进行了单相冷态模化试验研究，相应地得出了其变化规律。
In this paper, on the experimental bench of radial thick and thin swirl pulverized coal burner model, the single-phase cold state modal test was carried out on the mixing characteristics, spreading angle, recirculation zone and relative return of the jet when the angle was changed. , Correspondingly obtained its changing rule.