Effects of gasoline and polyoxymethylene dimethyl ethers blending in diesel on the combustion and emission of a common rail diesel engine

• Published in: Energy (Oxford) 2019-03, Vol.171, p.981-999
• Main Authors: Chen, Hao, Su, Xin, Li, Junhui, Zhong, Xianglin
• Format: Article
• Language: English
• Subjects: Air entrainment; Automotive parts; Blending effects; Combustion; Common rail; Common rail diesel engine; Diesel; Diesel engines; Dimethyl ether; Emission; Emission analysis; Emission standards; Entrainment; Ethers; Fuels; Gasoline; Internal combustion engines; Nitrogen oxides; Polyoxymethylene dimethyl ethers; Soot; Thermodynamic efficiency; Ultrafine particles; Ultrafines
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2019.01.089

To reduce the soot emissions of diesel engines, 20% polyoxymethylene dimethyl ethers (PODE) or gasoline by volume is blended in diesel (D80P20 and D80G20) and experimental studies have been carried out to compare the combustion and emission of blend fuels with diesel. Compared to diesel, D80P20 and D80G20 shorten the combustion duration, improve the brake thermal efficiency (BTE), increase the NOx emission and decrease the soot emissions and the number concentrations (NCs) of ultrafine particles (UFPs) in most cases. Strong premixed combustion and enhancement of air entrainment contribute to the highest BTE and NOx emissions of D80G20 at low and partial loads. Strong diffusion combustion contributes to the highest BTE and NOx emissions and the lowest soot and UFPs emissions of D80P20 at medium and high loads. To balance the NOx and soot emissions, PODE and gasoline are simultaneously added in diesel by 10% volume. BTE and NOx emission of D80G10P10 always rank the second. It has the lowest soot and UFPs emissions from 0.16 MPa to 0.48 MPa BMEP among the four fuels. Compared to diesel with original injection timing, suitable delay for D80G10P10 can simultaneously reduce the NOx, soot and UFPs emissions in the whole load range. [Display omitted] •Strong premixed combustion with gasoline and diffusion with PODE are compared.•D80G20 has the highest efficiency and NOx emission at low and partial loads.•D80P20 has the lowest soot, but the highest NOx emission at medium and high loads.•Blending PODE and gasoline in diesel can balance the soot and NOx emission.•Both soot and NOx emissions are reduced by injection delay using D80G10P10.