Abstract
By means of a technology method which combining diesel pilot injection and natural gas supplied to intake pipe forming gas mixture, engine bench test research has been done on a diesel engine when being fueled with natural gas and diesel fuel blends. On the basis of design natural gas supplying system, effects of natural gas and diesel blends under different alternative ratios on power performance were studied. The results indicate that natural gas combusted on diesel engine can improve torque performance of engine power points, the maximum torque increasing by 6.8%. And when the engine is running at low speed points, combustion efficiency is better using higher natural gas alternative ratio; while at high speed points, lower alternative ratio is suitable. Conclusion can be drawn that reasonable alternative ratio of natural gas cocombusted on diesel engine can improve power performance and economic performance of diesel engine.
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