为降低压燃式发动机颗粒排放，在一台压燃式发动机台架上，分别使用柴油、聚甲氧基二甲醚(PODE)、柴油/PODE混合物作为燃料，利用扫描电迁移率颗粒物粒径谱仪(SMPS)测量分析了发动机颗粒排放物粒径分布及数量浓度。结果表明：典型工况下，纯PODE发动机颗粒排放物粒径小，集中在10~30 nm的小粒径区域，而原柴油机则分布在10~200 nm更大粒径的区域；柴油中掺混适当比例PODE可大幅降低发动机颗粒排放总数和颗粒物体积；相同发动机转速下随负荷增加，混合燃料发动机排气颗粒的比排放浓度降低；速度特性下，随发动机转速增加，混合燃料发动机排气颗粒比排放浓度增加。%Experimental study was done on a turbocharged four-cylinder compression ignition engine fueled with diesel, PODE and diesel/PODE blended-fuel in order to reduce the particle material emission of compression ignition engines. Scanning mobility particle sizer (SMPS) was used to measure the particle size distribution. The test results showed that the particle emission of PODE engine was concentrated on the smal diameter scale of less than 30 nm, whereas the diesel engine was mainly between 10 nm and 200 nm. Both ultraifne particle emission and total particle volume of blended-fuel engine was obvious decreased compared with original diesel engine at a proper blending ratio. At ifxed engine speed, the number concentration of particle emission increased with the increase of engine load, while the speciifc number concentration decreased. On the other hand, the speciifc number concentration of particulate became more with the increase of engine speed under the same engine load.
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