Numerical simulation research into effects of injection rates on performances and emissions of diesel engine

作者：Leng Xian Yin; Long Wu Qiang^*; Feng Li Yan; Dong Quan; Li Hai Ying; Wang Xiang Jun; Yu Yong Xin; Wang Ai Guo

来源：Journal of Dalian University of Technology, 2011, 51(2): 180-187.

• Bench tests
• Combustion pro-cess
• Emissions
• Fuel-air mixing
• Gas flows
• High-power
• Injection rates
• Injection timing
• Low costs
• Marine Diesel Engines
• Numerical simulation
• Numerical simulation research
• Performance
• Performance and emissions
• Simulation result
• Soot emissions

To reduce the NOx emissions from medium speed marine diesel engines with low costs, a pressure-modulating-hole type fuel pump was developed, which could provide boot-type injection rates. 3D CFD package AVL FIRE v8.5 was used to simulate the in-cylinder gas flow, fuel-air mixing and combustion processes of a medium speed, high-power marine diesel engine. And the effects of the boot-type injection rates provided by the new pumps on the performance and emissions at 2 loads with 3 injection timings of the engine were analyzed. The simulation results indicate that, lower NOx emissions are obtained with the boot-type injection rates, among which the injection rate Boot1 can produce better φ(NOx)-φ(soot) compromise relationship, while injection rate Boot2 can produce better φ(NOx)-bi compromise relationship. Moreover, assuring the higher injection rates at the later stages of the boot-type injection is beneficial to reducing the soot emission and fuel consumption of the diesel engine. Bench tests were performed in a 6-cylinder diesel engine, and the results verify that the numerical simulation prediction is reliable.

• 出版日期2011