Experimental Investigation on Effect of Wall Roughness and Lubricant Film on the Adhered Fuel Film of N-Butanol-Diesel Blends after Spray Impingement

Xingyu Liang, Hongsheng Zhang, Gequn Shu, Yuesen Wang, Xiuxiu Sun, Hanzhengnan Yu and Ming Ge
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Xingyu Liang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Hongsheng Zhang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Gequn Shu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Yuesen Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Xiuxiu Sun: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Hanzhengnan Yu: China Automotive Technology & Research Center, Tianjin 300300, China
Ming Ge: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Energies, 2018, vol. 11, issue 6, 1-14

Abstract: The effect of wall roughness with different lubricant film thicknesses on the characteristics of adhered fuel films of diesel-n-butanol blending fuels after spray impingement has been investigated. Four steel plates with different types of roughness (root mean square height-Sq) that were coated with different lubricant film thicknesses (h l ) were used as impinged walls. The experimental conditions included dry walls (h l = 0), semi-wetted walls (SWW) with different thin oil films (0 < h l /Sq < 1), and fully wetted walls (FWW) with a thick lubricant film (h l > Sq). The results indicate that the adhered fuel mass ratio (ε) of blended fuel with 25% n-butanol (B25) was higher than that of blended fuel with 15% n-butanol (B15) under the same conditions. ε increased with an increase in Sq on the dry walls, but, under SWW conditions, it decreased with an increase in oil film thickness. The fuel film morphology was almost unaffected by the change in Sq, but the results implied that the roughness parameter-Skewness (Ssk) exerted a greater impact. The mean thickness h a and accumulated diameter D l of the adhered fuel film increased with an increase in h l , but, under FWW conditions, the effect of the roughness on the adhered film’s features was insignificant.

Keywords: wall roughness; lubricant film; n-butanol-diesel blends; spray impingement; adhered fuel film (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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