Visualization Study of Spray Characteristics of Aviation Kerosene Under Different Temperatures Based on Air-Assisted Injection
To elucidate the effects of fuel temperature and fuel injection pulse width on the characteristics of air-assisted aviation kerosene spray,an air-assisted fuel injection system was constructed on a constant volume combustion chamber,and high-speed shadow imaging technology was employed to investigate the spray characteristics of aviation kerosene under different fuel temperatures and injection pulse widths.The results show that when the fuel injection pulse width is 12 ms,high-temperature fuel droplets tend to move radially along the nozzle,while low-temperature fuel droplets tend to move axially.The fuel temperature is reduced from 40℃to-40℃,the average Satuer mean diameter increases by 14.7%,and the proportion of smaller particle sizes decreases significantly.When the fuel temperature is-40℃,the occurrence of"two-stage spray"under large fuel injection pulse widths has different effects on the spray penetration and area during the early and late stages,and the amplitude and width of the spray suction increase.And when the fuel injection pulse width increases from 5 ms to 14 ms,the average Sauter mean diameter increases by 22.2% .Therefore,for cold start at low temperature with large injection pulse width,increasing the fuel temperature appropriately can effectively promote the smooth start of the engine.
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