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A Study on Prediction of Unburned Hydrocarbons in Active Pre-chamber Gas Engine: Combustion Analysis Using 3D-CFD by Considering Wall Quenching Effects Waseda Univ
- Format:
- Book
- Conference/Event
- Author/Creator:
- Shota, Taki, author.
- Conference Name:
- 15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- It is important to reduce the Unburned Hydrocarbon (UHC)emission in order to improve the efficiency and minimize the totalemissions from a gas engine. The main reason for the formation ofUHC is the wall quenching phenomenon near the cylinder walls and inthe small gaps present inside the combustion chamber. In thisstudy, in order to reproduce the wall quenching phenomenon using3D-CFD, a wall quenching model was constructed based on Pecletnumber. This model was further integrated with the flamepropagation model and combustion analysis was conducted. From theresult of analysis, it was confirmed that a large amount of UHCremained in piston clevis and inside the small gaps. Furthermore,the model was capable of predicting the increase in UHC emissionswhen there was a delay in the ignition time. The flame front cellswere plotted on Peters' premixed turbulent combustion diagramto obtain the transition of the combustion states. From the plot,it was found that the flame surface transitions from corrugatedflamelets through thin reaction zones to wrinkled flamelets andfurther to laminar flamelets which lead to wall quenching.Additionally, it was found that the turbulent Reynolds numberdecreased rapidly. The rapid decrease in the turbulent Reynoldsnumber was due to the increase in laminar flame speed and flamethickness and the decrease in turbulent intensity and turbulentscale. It was also observed from the model that when the turbulentReynolds number was less than 10, there was a sharp increase in thewall quenching. In addition, the wall quenching occurred when thedimensionless wall distance was less than 40 (y+ <40) at anytiming
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-24-0049
- Access Restriction:
- Restricted for use by site license
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