Visualization of Coal-to-Liquid Spray and Ignition Characteristics in Constant Volume Bomb

TAN Guirong; ZHAO Zengliang; WANG Yi; CHEN Yulin; HUANG Haozhong

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (5) : 25-30.

TAN Guirong¹,ZHAO Zengliang¹,WANG Yi²,CHEN Yulin²,HUANG Haozhong²

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Abstract

Coal-to-liquid production process is mature and widely available, which is conducive to reducing China's dependence on oil imports. A visualization study was carried out by means of a constant volume combustion bomb to analyze the spray and ignition characteristics of coal-to-liquid under different environmental conditions. The results show that the coal-to-liquid and diesel sprays have good consistency under different working conditions and the spray development trend is the same. When the ambient temperature keeps constant at 500 K, the penetration distance of coal-to-liquid spray decreases by 22.67% and the spray cone angle increases by 46.9% as the ambient pressure increases from 3 MPa to 6 MPa. With the increase of ambient temperature, a large number of fuel droplets rapidly vaporize after crushing, so the spray penetration distance and spray cone angle show a significant downward trend. Under the high ambient pressure, the ignition timing of coal-to-liquid advances, the flame floating length shortens from 38.8 mm to 30 mm, and shows a good spherical flame pattern. Compared with diesel, the penetration distance of coal-to-liquid spray is shorter and the cone angle is larger. Under the ambient conditions of 500 K and 6 MPa, the penetration distances of coal-to-liquid and diesel spray are 46.4 mm and 49.6 mm respectively, which indicates that the coal-to-liquid is less prone to the phenomenon of wall impingement in practical use.

Key words

coal-to-liquid / constant volume bomb / spray characteristics / ignition characteristics

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TAN Guirong,ZHAO Zengliang,WANG Yi,CHEN Yulin,HUANG Haozhong. Visualization of Coal-to-Liquid Spray and Ignition Characteristics in Constant Volume Bomb[J]. Vehicle Engine. 2023, 0(5): 25-30