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2016中国汽车工程学会年会暨展览会

作者： Dong Wei Pu Chaojie Sun Yao Qiu Litao Ma Bin State Key Laboratory of Automotive Simulation and Control Jilin University

ISBN: (纸本)9789811035272;9789811035265

An experimental investigation of multiple injection at intake stroke under warm up conditions was performed in a GDI *** a constant excess air ratio,the effects of multiple injection strategy at intake stroke on the combustion and emissions were *** results showed that,compared to single injection,with the increase of injection times and coolant water temperature,cylinder pressure increased and its corresponding crank angle was advanced for multiple injection at intake stroke,while the peak transient heat released ratio increased,but its occurrence timing was slightly ***,THC emissions decreased obviously for multiple injection,but NOx emissions *** injection at intake stroke can reduce particle number concentration under warm up conditions,and the particle number concentration decreased with the increase of coolant ***,when at low coolant temperature,the size of particle number concentration performed as bimodal distribution of nucleation mode and accumulation *** the increase of coolant temperature,the peak size of particle number concentration behaves as a unimodal *** Comparing to the third injection timing for three different injection modes,it shows that,with the advance in injection time,the peak cylinder pressure and the maximum transient heat released rate increased,while corresponding crank angle was ***,NOx emissions increased,but THC emissions and the particle number concentration decreased.

关键词： GDI warm up multiple injection combustion emissions

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Single Zone, Zero Dimensional Model of Diesel multiple-injection

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Energy and Power Engineering 2016年第9期8卷 297-312页

作者： Ugochukwu Charles Ngwaka Chidebere Diyoke Nnamdi Anosike Mechanical Engineering Department Enugu State University of Science and Technology Enugu Nigeria Mechanical Engineering Department Nnamdi Azikiwe University Awka Nigeria

A detailed single zone, zero dimensional model of diesel multiple-injection system was developed from first principle, for compression, combustion and expansion processes for direct injection diesel engine. Equilibrium equation of Extended Zeldolvich Mechanism (EZM) for NOx formation was incorporated to predict NOx emission. A different approach was assumed for the equilibrium temperature. An approach of using the average cycle temperature within NOx formation region was used in the EZM equilibrium equation. The model codes were implemented in MATLAB. This model is developed to investigate the effects of both single and multiple-pulse fuel injection strategies on engine performance and NOx emissions. The results obtained from the model were validated with experimental data available in the literature. Results obtained showed that the use of average cycle temperature within the NOx formation temperature region could be useful in predicting NOx formation with reasonable degree of accuracy. injection timing, mass ratio of injected fuel, and dwell between pulses have significant effects on the NOx emission and engine performance. The results also show that as the number of pulses increases, NOx emission and engine performance decrease. For optimal balance between NOx and engine performance, mass of the pilot injection should be between 10 and 25% of the total mass of fuel used per cycle.

关键词： multiple injection Diesel Engine Emission

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Interaction between a diesel-fuel spray and entrained air with single- and double-injection strategies using large eddy simulations

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Propulsion and Power Research 2020年第1期9卷 37-50页

作者： Jonathan Brulatout François Garnier Patrice Seers Mechanical Engineering Department École de Technologie Supérieure1100 Notre-Dame Street WestMontrealH3C 1K3Canada

Interaction between fuel and air in a combustion chamber is one of the main drivers of the mixing ***,flow visualizations are limited by high droplet density in the ***,the ability of large eddy simulations(LES)to resolve large scales of flow offers good perspectives on capturing flow structures issued from the interaction between the Lagrangian(fuel droplets)and Eulerian(ambient gas)*** study examined these interactions first during a single injection using 3D and 2D criteria for both *** for the 3D criteria,the spray shape was analyzed in parallel to the Q-criteria applied to the Eulerian phase,making it possible to relate the spray deformations to some specific Eulerian ***,2D criteria were the fuel mass-fraction field and Eulerian streamlines,both taken in the mid-plane of the *** last analysis allows for identifying certain mechanisms involved in the Eulerian phase’s structure generation and relates it to high fuel-concentration areas in the fuel mass-fraction visualizations.

关键词： Diesel fuel spray Large eddy simulation multiple injection Coherent structures Lagrangian-Eulerian interaction Air-spray interactions

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