An Experimental Study on Spray Transient Characteristics of Fuel Containing Co2 Using a High Speed Camera = An Experimental Study on Spray Transient Characteristics of Fuel Containing Co2 Using a High Speed Camera

다국어 초록 (Multilingual Abstract)

Injection of fuel containing CO2 involves dissolving the gas into fuel prior to injection, which has potential to reduce the NOx and soot emissions in diesel engine. This paper presents an experimental study on the flash boiling and atomization process of transient spray of fuel containing CO2 spray by means of high speed imaging technology. Experiments were performed under atmospheric conditions on a diesel hole-type nozzle. The effect of injection pressure on the flash boiling and atomization process were evaluated, especially in the early stage of injection. The transient characteristics of the spray, such as spray-angle and spray tip penetration were also investigated. The images clearly display the developing process of flashing boiling spray . Experimental results show that fuel atomization will improve greatly when the concentration of dissolved CO2 in the fuel is larger enough. New insight into the flash boiling and atomization process of the fuel containing CO2 spray was obtained and possible mechanism to explain the phenomena was proposed.