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Three-Dimensional Models for Analyzing the Cyclic Variations in a Lean Burn CNG Engine

Journal of Beijing Institute of Technology 2007年第3期16卷 274-278页

作者：李国岫虞育松刘建英 School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

Three-dimensional models, consisting of the flame kernel formation model, flame kernel development model and natural gas single step reaction model, are used to analyze the contribution of cyclic equivalence ratio variations to cyclic variations in the compressed natural gas （CNG） lean burn spark ignition engine. Computational results including the contributions of equivalence ratio cyclic variations to each combustion stage and effects of engine speed to the extent of combustion variations are discussed. It is concluded that the equivalence ratio variations affect mostly the main stage of combustion and hardly influence initial kernel development stage.

关键词： three-dimensional model lean burn CNG engine equivalence ratio combustion cyclic variations

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Experimental evaluation of a 35 kVA downdraft gasifier

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Frontiers in Energy 2013年第3期7卷 300-306页

作者： Ashok Jayawant Rao KECHE Gaddale AMBA PRASAD RAO Department ol Mechanical Englneenng National Institute of lecnnology Warangal 506004 (AP) India

Energy conversion systems based on biomass are particularly interesting because biomass utilization effectively closes the carbon cycle besides achieving selfsustainability. Biomass is particularly useful for highly populated and agriculture dependent economic nations like China and India. A compact and cost effective downdrafl gasifcation system was developed. The present paper describes an experimental investigation on a biomass based gasifier engine system with a capacity of 35 kVA for power generation application. The problem of cooling and cleaning the hot and dirty gas from the gasifier has been satisfactorily solved by the effective cooling and filtration system. The gasifier developed is observed to be operation friendly. The quality of gas was evaluated in terms of its composition, conversion efficiency and total particulate matter. The maximum output of the power plant was obtained at the combustion zone temperature of 850~C. The experimental investigations showed that the percen- tage reduction in total particulate matter is 89.32%. The conversion efficiency of the biomass gasifier is found to be dependent on the operation conditions and fuel properties of the gasifier. The optimum value of equivalence ratio was observed to be 0.3134 for achieving the maximum gas conversion efficiency of the present gasifier configuration.

关键词： biomass gasification producer gas equivalence ratio total particulate matter conversion efficiency of gasifier

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Multi-Component Model of Diesel Sprays Under High Injection Pressure

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Journal of Shanghai Jiaotong university(Science) 2018年第2期23卷 264-268页

作者： WANG Xiaorong WANG Jigang JIN Zhangliang REN Guilong MA Hu School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang 212003 Jiangsu China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

The combustion efficiency of a diesel engine depends not only on spray characteristics but also on fuel-air mixing characteristics. Based on the original spray model, a new spray model is established in this paper to accurately predict the diesel spray, and then a multi-component evaporation model is added into it. The model takes the influence of component concentration gradient and species on its evaporation rate in the liquid phase into account. This paper studies the spray characteristics(spray penetration, spray angle and spray morphology) and fuel-air mixing characteristics(spray area, spray volume and air entrainment mass) using the spray model, and the results are compared with the experimental results. The comparison shows that the simulated spray penetration and spray angle are close to the experimental results with the average deviations less than 3%. Moreover, this paper studies the spray area, spray volume and air entrainment using empirical formula under different conditions. And the maximum deviations of the spray volume, spray area and air entrainment mass are less than 5% as compared with the test values. Overall, this spray model can predict the diesel spray characteristics and fuel-air mixing characteristics under high injection pressure accurately.

关键词： fuel-air mixing characteristics multi-component evaporation model diesel spray equivalence ratio

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乙炔-空气混合物中有限长楔面诱导斜爆轰波的起爆特性

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Acta Mechanica Sinica 2023年第2期39卷 138-146页

作者：张益晨项高翔涂启荣汪球魏浩天 School of Mechanics Civil Engineering&ArchitectureNorthwestern Polytechnical UniversityXi'an 710129China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBejing 100190China School of Astronautics Northwestern Polytechnical UniversityXi'an 710129China

斜爆轰波在高超声速推进具有重要的应用潜力,受到了研究者们的广泛研究。以往的研究,大多基于氢气燃料,且楔面总是无限长的.本文基于详细的化学反应模型,通过求解二维考虑基元反应的多组分欧拉方程,对乙炔-空气混合物在有限长楔形面诱... 详细信息

斜爆轰波在高超声速推进具有重要的应用潜力,受到了研究者们的广泛研究。以往的研究,大多基于氢气燃料,且楔面总是无限长的.本文基于详细的化学反应模型,通过求解二维考虑基元反应的多组分欧拉方程,对乙炔-空气混合物在有限长楔形面诱导的斜爆轰进行了数值和理论研究.根据受限空间内的起爆判据,研究了膨胀波、来流马赫数和当量比对斜爆轰波起爆特性的影响.结果表明,乙炔诱导的斜爆轰波的起爆距离相对大于氢燃料诱导的。爆燃波的会聚位置和膨胀波的产生位置决定了斜爆轰波的起爆特性.当膨胀波的产生位置在爆燃波会聚位置的下游,斜爆轰波被点燃;否则,斜爆轰波不会起爆.诱导区特征长度在不同当量比下呈U型曲线分布,无论是富燃还是贫燃都会导致斜爆轰波不起爆.

关键词： Acetylene Finite wedge Oblique detonation Initiation characteristics equivalence ratio

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Power and Emission Characteristics of Hydrogen Internal Combustion Engine

Power and Emission Characteristics of Hydrogen Internal Comb...

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2015中国汽车工程学会年会

作者： Tang Hongyang Sun Baigang Liu Fushui School of Mechanical Engineering Beijing Institute of Technology

To study the power and emission characteristics of hydrogen internal combustion engine,an experimental study was carried out using a 2.0 L port fuel-injected（PFI）hydrogen internal combustion *** results show the power of hydrogen internal combustion fell 40%comparing to the gasoline;NOx emission concentration is always higher than 8000ppm when the equivalent fuel-air ratio is larger than 0.8 and lower than 500ppm when the equivalent fuel-air ratio is smaller than *** increases with the increase of the ignition advance *** the equivalent fuel-air ratio is larger than *** test results and the conclusions exhibit a guiding role on hydrogen internal combustion engine optimizations.

关键词： HICE emission NOx equivalence ratio ignition advance angle

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甲烷-空气二维预混火焰中化学发光测量放热率的数值模拟与实验研究

甲烷-空气二维预混火焰中化学发光测量放热率的数值模拟与实验研究

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中国航天第三专业信息网第四十届技术交流会暨第四届空天动力联合会议

作者：胡悦谭建国吕良国防科学技术大学空天科学学院中国空气动力研究与发展中心

为了研究利用化学发光测量放热率与当量比的方法,在前期平面预混火焰研究的基础上,对甲烷-空气二维层流预混火焰进行了数值模拟与实验研究。使用19组分、39基元反应的简化机理对二维火焰进行数值模拟,得到了二维火焰的温度、放热率分布... 详细信息

为了研究利用化学发光测量放热率与当量比的方法,在前期平面预混火焰研究的基础上,对甲烷-空气二维层流预混火焰进行了数值模拟与实验研究。使用19组分、39基元反应的简化机理对二维火焰进行数值模拟,得到了二维火焰的温度、放热率分布,并分析了当量比、流速对火焰传播速度的影响,验证了数值模拟结果的正确性。利用ICCD相机测量了二维火焰中OH*和CH*的化学发光分布,研究了光强与放热率之间的定量关系。结果表明:同一当量比下,流速增大时火焰高度升高,火焰面锥角减小;数值仿真得到火焰传播速度与理论值符合的较好;二维火焰中OH*和CH*的化学发光均可以较为准确的标识反应的放热区,确定放热率分布;当量比相同、流速变化时放热率峰值并不发生显著变化,OH*光强峰值与放热率峰值之间存在很强的线性相关性,并且两者的函数关系与当量比无关;而CH*与放热率之间不存在类似的线性关系。在二维火焰中利用化学发光也可以实现对放热率的定量测量。

关键词： 2D laminar premixed flames Reduced reaction mechanism Chemiluminescence Heat release rate equivalence ratio

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