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A numerical study for the effect of liquid film on soot formation of impinged spray combustion Michigan Technological Univ
- Format:
- Book
- Conference/Event
- Author/Creator:
- Zhao, Zhihao, author.
- Conference Name:
- SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- Spray impingement in internal combustion engines has received great attention because the liquid film formed on the piston surface greatly contributes to emissions of particulate matter and unburnt hydrocarbons. During the cold start, the formation of the liquid film is more likely due to liquid contact on the impinging surface resulting from longer liquid penetration under lower ambient temperature. In this study, the effect of film formation on the emission level is numerically investigated using three-dimensional (3D) computational fluid dynamics (CFD) simulations with the Reynolds-averaged Navier-Stokes (RANS) approach. A modified primary reference fuel reaction mechanism which includes the PAH reactions is used in this study. The spray-wall interaction is modeled by the O'Rourke and Amsden wall film equations. CFD models were validated against experimental results in terms of spray penetration and ignition delay at inert and reacting spray conditions. The relative soot luminosity is also calibrated between experiments and simulations. Film area, mass and local film thickness are obtained to evaluate the film formation under different ambient temperature environments in impinged spray combustion. By comparing total soot mass from simulations with and without a film formed on the impingement surface, contributions of the pool flame from the wall film to the total soot emission can be quantified. The ratio of film mass to soot mass which is generated by film is obtained to explain the contributions of liquid film on total particle emissions
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-0543
- Access Restriction:
- Restricted for use by site license
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