A Low-NOx High-Efficiency Engine System for Alternative Fuels by Mean of Ultra-Lean Homogeneous-Charge Premixed Combustion

采用超稀薄均质预混燃烧的低氮氧化物高效替代燃料发动机系统

• 批准号: 07555071
• 负责人: IKEGAMI Makoto
• 金额: $ 9.66万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555071/
• 关键词: Alternative Fuel; Lean-Burn Engine; Premixed Combustion; Mixture Heteogeneity; Thermodynamic Model; NOx Formation; Exhaust Measurement; CFD Simulation; 均一予混合燃焼; NO_x生成; アルデヒド排出; 均一混合気; 化学反応動力学; 過給機

This study aims at the establishment of the high-efficiency low-NOx engine for alternative fuels at lean homogeneous-charge combustion. The contents of the present study are summarized as follows :1.Lean limits of homogeneous premixture were investigated in a spark-ignition engine fueled by naturalgas and LPG,and the factors for determining the limit and the method for extending it were shown.2.Experiments for a variety of engine types and sizes at lean-burning operations show that a homogeneous mixture allows much more reduction of the exhaust NOx concentration than a heterogeneous mixture. In addition, the histories of temperature and NO concentration were calculated using a thermodynamic model based on the measured rates of heat release for the mixture having different degrees of heterogeneity. It was shown that a lean-burn engine with a more homogeneous mixture is desirable, and that much reduction of NO may be achieved once the burnt gas is artificially mixed during combustion to … More make the burnt zone more uniform.3.Real-time measurement of exhaust gas emissions in a lean-burn gas engine was carried out by using Fourier transform infrared spectroscopy analyzer. From the measured results, it was shown that not only unburnt HC but also combustion-generated HC increase in lean combustion. Furthermore, the characteristics of exhaust emissions under a cold start condition were measured, and high concentrations of HCs were detected just after the firing operation, whereas NOx gradually increases from the start.4.A three-dimensional model for the combustion process and NO formation in a homogeneous-charge engine was established based on a submodel for flame development. Computations carried out for different conditions gave a good reproduction of the entire combustion process. The spatial profiles of heat-release rates, the flame temperature and the NO concentration were investigated to clarify the mechanism of NO formation with special attention to mixing of heat and mass in the combustion process. Less

本研究旨在建立高效、低nox的稀均装燃烧替代燃料发动机。本文的研究内容总结如下：1。在以天然气和液化石油气为燃料的火花点火发动机上，研究了均质预混料的稀薄极限，给出了确定稀薄极限的因素和扩大稀薄极限的方法。对各种发动机类型和尺寸的稀薄燃烧操作的实验表明，均匀混合物比非均匀混合物更能降低废气中的氮氧化物浓度。此外，使用基于测量的不同程度非均质性混合物的放热速率的热力学模型计算温度和NO浓度的历史。结果表明，采用更均匀的混合气的稀燃发动机是可取的，并且在燃烧过程中人工混合燃烧气体以使燃烧区域更均匀，可以大大减少NO。利用傅里叶变换红外光谱分析仪对某型稀燃燃气发动机的尾气排放进行了实时测量。结果表明，稀薄燃烧不仅使未燃HC增加，而且使燃烧产生的HC增加。此外，对冷启动条件下的尾气排放特征进行了测量，在燃烧后检测到高浓度的hc，而NOx从一开始就逐渐增加。在火焰发展子模型的基础上，建立了均装药发动机燃烧过程和NO生成的三维模型。在不同条件下进行的计算很好地再现了整个燃烧过程。研究了燃烧过程中释放热量、火焰温度和NO浓度的空间分布，以阐明NO的形成机制，并特别关注燃烧过程中热量和质量的混合。少

项目成果

塩路昌宏: "気体燃料および混合気体燃料のエンジン燃焼特性" 第12回内燃シンポジウム講演論文集. 265-270 (1995)

Masahiro Shioji：“气体燃料和混合气体燃料的发动机燃烧特性”第12届内燃机研讨会论文集265-270（1995）。

塩路昌宏: "乱流予混合燃焼の層流火炎片モデル" 第33回燃焼シンポジウム前刷集. 75-77 (1995)

Masahiro Shioji：“湍流预混燃烧的层流火焰碎片模型”第 33 届燃烧研讨会预印本集 75-77（1995）。

池上詢: "火花点火機関の燃焼とNOx生成のCFDシミュレーション" 第13回内燃機関シンポジウム・講演論文集. 565-570 (1996)

Akira Ikegami：“火花点火发动机中燃烧和氮氧化物生成的 CFD 模拟”第 13 届内燃机研讨会论文集 565-570（1996 年）。

M.Shioji: "Combustion Characteristics of an Engine Using Gaseous Fuels and Blended Gaseous Fuels" Proc.12nd Symp.on Int.Comb.Engine. 265-270 (1995)

M.Shioji：“使用气体燃料和混合气体燃料的发动机的燃烧特性”Proc.12nd Symp.on Int.Comb.Engine。

M.Shioji: "Effect of Mixture Heterogeneity on the Formation of Nitrogen Oxides in Lean-Burn Gas Engines" Trans.JSME,61-588. B. 3092-3098 (1995)

M.Shioji：“混合异质性对稀薄燃烧燃气发动机中氮氧化物形成的影响”Trans.JSME，61-588。