The development of a diesel engine model using one-dimensional （1-D） fluid-dynamic engine simulation codes,and its validation using experimental measurements are described in this paper.The model was calibrated by r...The development of a diesel engine model using one-dimensional （1-D） fluid-dynamic engine simulation codes,and its validation using experimental measurements are described in this paper.The model was calibrated by running the engine on an electric dynamometer at eight steady-state operating conditions.The refined engine model was used to predict the oxides of nitrogen （NOx） less than those measured earlier in the experiments,and hence to recommend changes in the engine for the verification of the results.The refined engine model is greatly influenced by the start of injection angle （ψ）,ignition delay （φ）,premix duration （DP）,and main duration （DM） for the prediction of reduced NOx emissions.It is found that optimum ψ is 6.5° before top dead center （BTDC）.At this angle,the predicted and experimental results are in good agreement,showing only a difference of up to 4%,6.2%,and 7.5% for engine performance,maximum combustion pressure （Pmax）,and NOx,respectively.展开更多
针对一款进气凸轮包角为190°CA的2.0 T GDI缸内直喷奥拓循环汽油发动机,采用BOOST软件建立了一维性能仿真计算模型,在对模型进行标定的基础上,仿真计算了150°CA、170°CA进气凸轮包角所实现的Miller循环发动机的动力性和...针对一款进气凸轮包角为190°CA的2.0 T GDI缸内直喷奥拓循环汽油发动机,采用BOOST软件建立了一维性能仿真计算模型,在对模型进行标定的基础上,仿真计算了150°CA、170°CA进气凸轮包角所实现的Miller循环发动机的动力性和经济性.研究结果表明,所建立的一维仿真计算模型能够较为精确的模拟缸内直喷汽油机的比油耗、功率及扭矩;采用150°CA、170°CA进气凸轮包角的发动机相比于190°CA进气凸轮包角的额定功率有所下降,且150°CA和170°CA进气凸轮包角需采用更高的增压比;随着进气凸轮包角的减小,外特性工况油耗依次上升,但部分负荷的油耗随着进气包角的减小而显著改善.展开更多
基金Sponsored by the National Natural Science Foundation of China (50576063)
文摘The development of a diesel engine model using one-dimensional （1-D） fluid-dynamic engine simulation codes,and its validation using experimental measurements are described in this paper.The model was calibrated by running the engine on an electric dynamometer at eight steady-state operating conditions.The refined engine model was used to predict the oxides of nitrogen （NOx） less than those measured earlier in the experiments,and hence to recommend changes in the engine for the verification of the results.The refined engine model is greatly influenced by the start of injection angle （ψ）,ignition delay （φ）,premix duration （DP）,and main duration （DM） for the prediction of reduced NOx emissions.It is found that optimum ψ is 6.5° before top dead center （BTDC）.At this angle,the predicted and experimental results are in good agreement,showing only a difference of up to 4%,6.2%,and 7.5% for engine performance,maximum combustion pressure （Pmax）,and NOx,respectively.
文摘针对一款进气凸轮包角为190°CA的2.0 T GDI缸内直喷奥拓循环汽油发动机,采用BOOST软件建立了一维性能仿真计算模型,在对模型进行标定的基础上,仿真计算了150°CA、170°CA进气凸轮包角所实现的Miller循环发动机的动力性和经济性.研究结果表明,所建立的一维仿真计算模型能够较为精确的模拟缸内直喷汽油机的比油耗、功率及扭矩;采用150°CA、170°CA进气凸轮包角的发动机相比于190°CA进气凸轮包角的额定功率有所下降,且150°CA和170°CA进气凸轮包角需采用更高的增压比;随着进气凸轮包角的减小,外特性工况油耗依次上升,但部分负荷的油耗随着进气包角的减小而显著改善.
