转速增加碳烟颗粒数密度增加，但是却存在一个最佳转速使碳烟的体积分数最小；
The number density of soot is increased by the engine speed. But there is a best speed that makes the volume fraction of soot least.
转速增加碳烟颗粒数密度增加，但是却存在一个最佳转速使碳烟的体积分数最小；
The number density of soot is increased by the engine speed. But there is a best speed that makes the volume fraction of soot least.
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