Journal
FUEL
Volume 337, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.127180
Keywords
SWI; Impingement; Soot; Spray combustion; Flame temperature
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To investigate the effect of the wall on soot formation during spray combustion and explain the contradictory results, the vapor-phase, ignition, combustion, and soot formation of free-and impingement-spray were studied at different wall temperatures. Optical diagnostic techniques were used for comparison. The results show that compared to free spray, impingement spray has reduced vapor-phase spray tip penetration and increased vapor-phase spray volume. It also has a shorter ignition delay time when only the vapor-phase impinges on the wall. The soot formation of impingement spray is approximately one-third of free spray due to increased air entrainment. The relationship between wall temperature and soot formation is non-linear.
To investigate the effect of the wall on soot formation during spray combustion and to explain the existence of contradictory results, the vapor-phase, ignition, combustion, and soot formation of free-and impingement-spray with different wall temperatures were studied in comparison using optical diagnostic techniques. Results reveal that, compared to free spray, the impingement spray's vapor-phase spray tip penetration is reduced, and its vapor-phase spray volume is increased by about three times. At conditions where only the vapor-phase impinges on the wall, the impingement spray has a shorter ignition delay time (IDT) for various wall temperatures. Furthermore, the soot formation of the impingement spray combustion is approximately one-third of the free spray, and the increase in air entrainment accounts for this phenomenon. In a comparison of different wall temperature conditions, the higher wall temperature facilitates the spray ignition process with a shorter IDT, and the ignition location is further away from the wall. However, the relationship between wall temperature and soot formation is not linear. The soot formation varies in a pattern of reducing and then increasing as the wall temperature increases due to the high wall temperature accelerating both the generation and oxidation rate of soot.
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