1)SV Surface-Volume Ratio,表面积/体积比(燃烧室)2)combustion chamber surface to volume ratio,燃烧室面积对体积之比3)area-volume ratio of combustion,燃烧室面积比4)combustion chamber surface area,燃烧室表面积5)combustion chamber area,燃烧室面积6)area ratio of combustion chamber passage,燃烧室通道面积比