主燃区 meaning in English

flame zone
main combustion zone
primary combustion zone
primary zone

Study on primary combustion zone of aeroengine combustor
航空发动机燃烧室主燃区特性的研究
Macroscopical phenomenon description , scanning electron microscope ( sem ) analysis , electronic probe and x ray diffraction ( xrd ) analysis were used to analyze the phenomena of fouling and slagging in the main combustion zone , reburning zone and burned zone , with emphasis on the difference and its reason in reburning zone
通过宏观现象描述、微观扫描电镜( sem )分析、电子探针和x射线衍射仪( xrd )物相分析，对炉内主燃区、再燃区和燃尽区沾污结渣状况进行研究，重点分析再燃区的沾污结渣差异及原因。