Spray Characteristics of Polyoxymethylene Dimethyl Ethers Blended Fuels

ZHOU Yu; XIONG Yaxin; LIN Qizhao

doi:10.3969/j.issn.1001-2222.2024.05.004

Vehicle Engine ›› 2024, Vol. 0 ›› Issue (5) : 25. DOI: 10.3969/j.issn.1001-2222.2024.05.004

Spray Characteristics of Polyoxymethylene Dimethyl Ethers Blended Fuels

ZHOU Yu¹,XIONG Yaxin¹,LIN Qizhao²

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Abstract

The development of alternative fuels is an important means to alleviate petroleum energy shortage and environmental pollution. Among numerous alternative fuels, oxygen-containing fuels have been greatly developed because of their renewability, low carbon content, and ability to reduce exhaust emission. Polyoxymethylene dimethyl ethers (PODE), ethanol and biodiesel are all oxygen-containing alternative fuels with great development potential. In actual engines, the spray behavior of alternative fuels directly affects the subsequent combustion and emission process. PODE can be used as a solvent aid for diesel-ethanol fuel and can make up for the shortcomings of high viscosity and low volatility of biodiesel, the spray characteristics of diesel-ethanol-PODE and biodiesel-PODE blended fuels were hence studied in a constant volume combustion chamber. The results show that the spray tip penetration (STP) is little influenced after mixing PODE in blended fuel with diesel, and first increases and then decreases with the increase of PODE in blended fuel with biodiesel. Adding PODE and ethanol to diesel can increase the spray cone angle (SCA) and improve the radial diffusion, but has little effect on the diesel spray projected area (SPA) , and the entrainment ability of blended fuel to air is similar to that of diesel. Adding PODE to biodiesel significantly in〖JP2〗crease the spray cone angle and spray projected area of blended fuel, which can effectively improve the spray quality of biodiesel.

Key words

polyoxymethylene dimethyl ethers (PODE) / ethanol / biodiesel / diesel / spray characteristics / spray tip penetration / spray cone angle

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ZHOU Yu,XIONG Yaxin,LIN Qizhao. Spray Characteristics of Polyoxymethylene Dimethyl Ethers Blended Fuels[J]. Vehicle Engine. 2024, 0(5): 25 https://doi.org/10.3969/j.issn.1001-2222.2024.05.004