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.

youdao

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.

youdao