Experiment on Flash Boiling Spray Characteristics of n-Pentane Using DI Injector
The flash boiling spray of n-pentane was conducted under different conditions,using schlieren method in a constant volume bomb.By photographing and processing the spray images,the influences of fuel temperature, ambient back pressure and injection pressure on flash boiling spray were studied.The test results show that when flash boiling spray happens,the number of discrete droplets increases,and the size becomes smaller.At the same time, when increasing fuel temperature or decreasing ambient back pressure,spray penetration distance decreases first and then increases,but spray cone angle,together with spray area,increases first and then decreases.On the other hand,while increasing injection pressure,spray penetration distance,spray cone angle and spray area increase, too.When fuel temperature ranges from 293,K to 363,K,ambient back pressure ranges from 30,kPa to 100,kPa,and injection pressure ranges from 5,MPa to 10,MPa,the main factor influencing spray penetration distance is injection pressure,followed by ambient back pressure,and then fuel temperature,and at the same time,ambient back pres-sure makes the biggest difference in spray cone angle,then fuel temperature and injection pressure.Finally the main factor influencing spray area is injection pressure,followed by ambient back pressure and fuel temperature.
schlieren methodflash boiling sprayspray penetration distancespray cone anglespray area
NETL
NSTL
万方数据
维普
