CFD Simulation for Combustion System Optimization of an HSDI Diesel Engine
Effects of included spray angle with different injection strategies on combustion characteristics, performance and amount of pollutant emission in a common rail heavy duty DI Diesel engine have been computationally investigated. The CFD model was firstly validated with experimental data achieved from a Caterpillar 3401 diesel engine for a conventional part load condition at 1600 rev/min. Good agreement of calculated and measured in-cylinder pressure, heat release rate and pollutant formation trends were obtained under various operating points. The calculation was performed from intake valve closing to exhaust valve opening at two EGR rates. Three different types of included spray angles (α= 145°, 105°, 90° CA) were studied in comparison with the traditional spray injection angle (α=125° CA). The results show that spray targeting is very effective for controlling the in-cylinder mixture distributions especially when it accompanied with an optimized injection strategy. It was found that 105° spray cone angle along with optimized EGR rate and split injection strategy could significantly reduce NOx and soot emissions without much penalty of the fuel consumption, as compared to the wide spray angle. In addition, a narrow injection angle offers more efficient air-mixing process due to better interaction with the combustion chamber and cylinder liner.
common rail DI diesel engine narrow fuel spray angle split injection strategy CFD simulation
PENG Zhi-jun Raouf Mobasheri
Department of Engineering and Design, University of Sussex, Brighton, United Kingdom
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
405-411
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）