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http://dx.doi.org/10.3795/KSME-B.2009.33.6.454

Study on the Behavior Characteristics of the Evaporative Diesel Spray under Change in Ambient Conditions  

Yeom, Jeong-Kuk (동아대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.33, no.6, 2009 , pp. 454-460 More about this Journal
Abstract
To analyze the mixture formation process of evaporating diesel spray is important for emissions reduction in actual engines. Then the effects of change in density of ambient gas on spray structure in high temperature and pressure field have been investigated in this study. The ambient gas density was changed from ${\rho}_a=5.0kg/m^3$ to ${\rho}_a=12.3kg/m^3$ with CVC(Constant Volume Chamber). Also, simulation study by modified KIVA-II code was conducted and compared with experimental results. The ambient temperature and injection pressure are kept as 700K and 72MPa, respectively. The images of liquid and vapor phase in the evaporating free spray were simultaneously taken by exciplex fluorescence method. As experimental results, with increasing ambient gas density, the tip penetration of the evaporating free spray decreases due to the increase in the drag force from ambient gas. The spatial structure of a diesel spray can be verified as 2-regions consisted of liquid with momentum decrease and vapor with large-scale vortex. The calculated results obtained by modified KIVA-II code show good agreements with experimental results.
Keywords
Diesel-Free Spray; Evaporative Spray; Exciplex Fluorescence Method; Phase Change; Mixture Formation Process;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 1
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