渗透率最低点对应的转速为最佳转速。
同时得到了估算最佳转速的经验公式。
Meanwhile, an empirical formula for evaluating the optimal rotational velocity is obtained.
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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