结果表明，一次风射流由于与上游横向射流的相互作用，在背火侧形成尾迹涡，在向火侧形成剪切涡。
It is showed that being the interaction between primary air and upstream fluid, the shear eddy the the wake are formed on the two sides of the primary air respectively.
向火侧与背火侧浓度比在1 ~ 4的大范围内可调节，保证了锅炉在变负荷工况下实现最佳浓淡比燃烧。
Concentration ratio of fire side to back side is adjustable within the wide range of 1 ~ 4 so as to ensure the realization of optimum rich-lean ratio firing under variable load conditions.
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