primary zone
... primary combustion zone 一次燃烧区域 ; 主燃区 main combustion zone 主燃区 combustion area，combustion zone 燃烧带 ...
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... perforated flare 带孔的喇叭管 primary combustion zone 主燃区 upstream上游，逆流 ...
·2,447,543篇论文数据，部分数据来源于NoteExpress
发现真实结构燃烧室内的回流区不再是轴对称，主燃孔和二次气流的存在使回流区明显被压扁（最扁处的长轴约为短轴的1.6倍）；
The presence of primary hole air flows remarkably squeezes the recirculation zone, resulting in a elliptic-like cross section, with the long axis is longer than the short one up to 1.6 times.
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