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

过，反向风把煤灰灌进驾驶。

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下,单台阶结构的燃有更好的燃性能。