|
|
International Journal of Automotive Technology 2001;2(4): 165-170. |
| SPRAY STRUCTURE OF HIGH PRESSURE GASOLINE INJECTOR IN A GASOLINE DIRECT INJECTION ENGINE |
| Chang Sik Lee1, Mun Soo Chon2, Young Cheol Park3 |
1Hanyang University
2Daewoo Motors
3Shinsung College |
|
|
|
|
|
| ABSTRACT |
|
This study is focussed on the investigation of spary charcateristics from the high pressure gasoline injector for the application of gasoline direct injection engine. For the analysis of spray structure of high pressure gasoline injetor; the laser scattering method with a Nd-Yag laser and the Phase Doppler particle analyzer system were applied to observe the spray development and the measurement of the droplet size and velocity of the spray, respectively. Also spatial velocity distribution of the spray droplet was measured by use of the particle image velocity system. Experimental results show that high pressure gasoline injector shapes the hollow-cone spray, and produce the upward ring shaped vortex on the spary surface region. This upward ring shaped vortex promotes the secondary atomization of fuel droplets and contributes to a uniform distribution of fuel droplets. Most of fuel droplets are distributed under 31 ㎛ of the mean droplet size (SMD) and the frequency distribution of the droplet size under 25 ㎛ is over 96% at 7 MPa of injection pressure. According to the experimental results of PIV system, the flow patterns of the droplets velocity distribution in spary region are in good agreement with the spray macroscopic behaviors obtained from the visualization investigation. |
| Key Words:
Spray structure, High-pressure injection, Phase Doppler particle analyzer, Sauter mean diameter |
|
|
|
Preview
Full text via DOI 
Download Citation 
Print 
