The Effects of Cavitation on Superheated Aviation Kerosene Atomization
Over the past several decades, flash atomization applied in engines has attracted considerable attention because of its potential advantages in combustion performance. Flash atomization often occurs in nozzles working at either high temperatures or large pressure drops. However, recent research shows that cavitation and superheating were the key factors of flash atomization. Flow velocity and nozzle orifice L/D ratio (nozzle length/nozzle exit diameter) were the main parameters of cavitation. Firstly, the bubble point temperatures of aviation kerosene (RP- 3) over a wide range of ambient pressures were investigated by using a common method. A simple and practical correlation for bubble point temperature was developed, taking bubble point temperature as the function of ambient pressure. The calculated values were in good agreement with the experimental ones. Furthermore, experiments were carried out to study the effects of cavitation on flash atomization by ejecting superheated liquid aviation kerosene into a vacuum chamber through five different plain orifice spray nozzles. Superheated liquids were observed to spray in three different patterns: conventional pressure spray, boiling spray, flashing spray. The results demonstrated that critical superheat for flashing was decreased with the increase of either the flow velocity or the nozzle diameter. The influences of flow velocity and nozzle geometry on spray width and core liquid length were also studied by high-speed camera.
flash atomization cavitation flow velocity L/D ratio bubble point critical superheat
FAN Zhen-cen FAN Wei ZHAO Lin
School of Power and Energy, Northwestern Polytechnical University, Xian, China
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
370-375
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）