In tunnels, a lashing backwind fills the cab with soot.

过隧道时，反向风把煤灰驶室。

Furthermore, as the total step height is the same, the combustor configuration with one backwind step has higher performance than the combustor configuration with two backwind step.

在台阶度一定的条件,台阶结构的燃烧室具有更好的燃烧性能。