recirculation zone造句

The simulations results show that the average combustion temperature is much lower in fuel - rich state and little higher in oxygen - rich state near the best o / f ratio . by extending the post - chamber length the oxidizing gas and the fuel pyrolytic gas can burn completely and the average combustion temperature can be prominently increased . the fuel - rich recirculation zone close to the head of combustion chamber is very important for the combustion
计算结果分析表明：发动机在富燃状态下平均燃烧温度偏低，在接近理想配比的富氧状态下平均燃烧温度有所提高；加长补燃室可以大幅度提高发动机的平均燃烧温度，并促进氧化剂气体和热解气体的充分燃烧；燃烧室头部的富燃回流区对发动机的燃烧非常重要，去掉燃烧室头部突扩段后，氧化剂气体和燃料热解气体不能充分燃烧，发动机的平均燃烧温度大幅下降。
It's difficult to find recirculation zone in a sentence. 用recirculation zone造句挺难的