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| Effects of Polyoxymethylene Dimethyl Ethers on the Combustion and Emission Characteristics of A Diesel Engine at Plateau Environment |
| DOI：10.13949/j.cnki.nrjgc.2022.06.007 |
| Key Words:diesel engine plateau environment polyoxymethylene dimethyl ethers（PODE） external characteristic combustion characteristic |
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| Abstract:Taking diesel fuel blended with polymethoxydimethyl ethers （PODE） of different volume fractions （10%， 20%） as oxygenated fuel， an engine bench test was carried out with a diesel engine of a military pump unit， and the plateau area was simulated by controlling the intake pressure. The diesel engine intake conditions were used to investigate the effects of oxygenated fuel on the external characteristics， combustion characteristics and emission performance of the engine at simulated altitudes in the range of 0~4 000 m.Results show that， under the low altitude， the power and fuel economy of diesel engine fueled by PODE/diesel blend fuel were lower than that of 0# vehicle diesel. With the increase of altitude， the power and economy of diesel engine fueled by this oxygenated fuel gradually approached that of vehicle diesel. When the simulated altitude reached 4 000 m， the power of the diesel engine fueled with 20% PODE fuel was increased by 3.6% and the fuel consumption rate was decreased by 1.2% on average. At working condition of altitude 4 000 m， speed of 2 000 r/min and 100% load， compared with 0# vehicle diesel fuel， the combustion phase of PODE/diesel blend fuel became closer to the top dead center. The maximal cylinder pressure and the peak value of heat release of PODE/diesel blend fuel increased， while the ignition delay time and the combustion efficiency decreased slightly. At different altitudes， the HC and CO emissions of the engine fueled with oxygenated fuel reduced significantly， while the NOx emission increased slightly. |
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