Numerical simulation of diesel combustion with a high exhaust gas recirculation rate
A series calculation method from injector nozzle internal flow to in-cylinder combustion in diesel engines has been developed. In this study, the calculation results of in-cylinder pressure, heat release rate, and NO concentration are compared with experimental results for conventional combustion conditions as well as an advanced combustion condition, which combines a high exhaust gas recirculation (EGR) rate, high boost pressure, and high pressure injection. The calculated pressure and heat release rate histories are in reasonable agreement with those of experiments, but the NO concentration is underestimated especially on the higher EGR rate condition. Therefore, an investigation to improve the quantitative accuracy of NO concentration is performed. The probability density function (PDF) method is one way to estimate the accurate mean reaction rate containing the reaction rate fluctuation by turbulence. In this study, the PDF method only applied for NO calculation is developed to balance the calculation accuracy and the computational cost. The result shows that the reaction rate fluctuation, on NO formation, has a small effect on conventional combustion conditions, but increases with decreasing combustion temperature
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/14680874
-
Authors:
- YAMAMOTO, S
- NAGAOKA, M
- UEDA, R
- WAKISAKA, Y
- NODA, S
- Publication Date: 2010
Language
- English
Media Info
- Pagination: 17-27
-
Serial:
- International Journal of Engine Research
- Volume: 11
- Issue Number: 1
- Publisher: Sage Publications, Incorporated
- ISSN: 1468-0874
- EISSN: 20413149
Subject/Index Terms
- TRT Terms: Air quality management; Combustion; Diesel engines; Emission control devices; Exhaust gases; Nitrogen oxides; Simulation; Temperature
- Uncontrolled Terms: Aftertreatment
- Subject Areas: Vehicles and Equipment; I15: Environment; I91: Vehicle Design and Safety;
Filing Info
- Accession Number: 01155301
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD
- Created Date: Apr 23 2010 11:00AM