The Size Distribution Characteristic of PM Emitted from Diesel Engine and LNG Engine
The Size Distribution Characteristic of PM Emitted from Diesel Engine and LNG Engine
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发表时间：
2009
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通讯作者：
Liu Zhihua;Tan Jianwei
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作者：
Liu Zhihua;Tan Jianwei
利用电低压冲击器，在发动机试验台对某型越野风冷柴油机、某型柴油机和LNG发动机的颗粒数进行了研究。试验结果表明：越野发动机、柴油机和LNG发动机在最大功率模式和最大扭矩模式下，PM排放量级分别为10~7 cm~（-3）、10~6 cm~（-3）和10~5 cm~(-3)，但其尺寸分布完全不同。在发动机转速固定的情况下，随着负荷的增加，柴油机制动比PM数浓度增大。LNG发动机制动比PM数浓度随负荷的增加呈现先升高后降低的趋势。在固定节气门开度下，柴油机制动比PM数浓度随转速的增加而降低，LNG发动机制动比PM数浓度随转速的增加呈现先升高后降低的趋势。LNG发动机的CMD小于柴油发动机。
With an electrical low-pressure impactor(ELPI),the particle matter number of an off-road air-cooler diesel engine,a diesel engine and LNG engine were studied on the engine test bench.The test results showed that:at the maximum power mode and maximum torque mode,the PM emissions magnitude are 10~7 cm~(-3),10~6 cm~(-3),10~5 cm~(-3) for the off-road engine,diesel engine,LNG engine respectively, while their size distributions were totally different.At fixed engine speed,the brake specific PM number concentration of diesel engine increased with the increase in load.The brake specific PM number concentration of LNG engine showed an increasing trend and then decreasing trend with the increase of load.At fixed throttle opening,the brake specific PM number concentration of diesel engine decreased with the increase in speed,while the brake specific PM number concentration of LNG engine showed an increasing trend and then decreasing trend with the increase of engine speed.The CMD of LNG engine was smaller than that of diesel engine.