Fundamental Study on Lean Premixed Combustion under High Temperature Preheated Condition

高温预热条件下稀薄预混燃烧的基础研究

• 批准号: 14350100
• 负责人: AZETSU Akihiko
• 金额: $ 8.19万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350100/
• 关键词: Lean Premixed Combustion; Preheat; High Tmeperature; Blow off Limit; Low Temperature Oxidation Reaction; Combustion Temperature; Compression Ignition; Near-infrared Frequency Modulation Spectroscopy; メトキシメチル; 圧縮白着火; 保炎; アルキルラジカル; 排気分析; 壁効果

In order to achieve the homogeneously premixed combustion under the high temperature preheated condition, fundamental study concerning the physical process and the chemical process of combustion were examined in detail.To analyze the combustion characteristics of high temperature preheated mixture, blow-off limit was measured by using an optical burner system. The fuels used were Methane, Bethune and DME. The equivalence ratio of blow-off limit becomes lower as the preheated temperature becomes higher for all fuels. Due to the extended lean limit, combustion temperature becomes slightly lower under preheated condition, and confirmed the usefulness of the proposed combustion method. In the case of DME combustion, low temperature oxidation reaction was taking place within the pre-heater under the preheated temperature around 630 K, however it resulted in the deterioration of blow-off characteristics. On the contrary to this tendency, the low temperature oxidation reaction results in the … More promotion of ignition under the compression ignition condition.. The amount of heat release during cool flame reaction in this case was mainly affected by the oxygen concentration at the start of low temperature oxidation reaction.Low temperature oxidation mechanism taking place as a pre-combustion process in high temperature air combustion has been investigated by two methodologies. Near-infrared frequency modulation spectroscopy revealed the product formation pathways in photolytically initiated alkyl +O_2 reactions; e.g., methoxymethyl forms OH + HCHO directly and HO_2 indirectly in dimethyl ether oxidation, whereas ethyl directly forms HO_2 in ethane oxidation. In composition analysis of premixed compression ignition of dimethyl ether in a motored piston engine, significant intermediates formed at cool flames were detected. It was found that the relative amount of produced formaldehyde against residual fuel determines the extent of cool flame oxidation via the chain reaction terminating effect of formaldehyde. Less

为了实现高温预热条件下的均质预混燃烧，对燃烧的物理过程和化学过程进行了深入的基础研究，并利用光学燃烧器系统对高温预热混合气的燃烧特性进行了测试。使用的燃料是甲烷、白求恩和二甲醚。对于所有燃料，随着预热温度的升高，吹出极限当量比降低。由于扩展的贫极限，燃烧温度变得稍微低预热条件下，并证实了所提出的燃烧方法的有效性。在DME燃烧的情况下，预热器内在630 K左右的预热温度下发生低温氧化反应，但导致吹脱特性恶化。与此趋势相反，低温氧化反应导致 ...更多信息 在压缩点火条件下促进点火。在这种情况下，冷焰反应过程中的放热量主要受低温氧化反应开始时的氧气浓度的影响。低温氧化作为高温空气燃烧中的预燃过程发生的机理通过两种方法进行了研究。近红外频率调制光谱揭示了光解引发的烷基+O_2反应中产物的生成途径，甲氧基甲基在二甲醚氧化中直接生成OH + HCHO，间接生成HO_2;乙基在乙烷氧化中直接生成HO_2。在二甲醚预混压燃发动机的成分分析中，发现了冷焰时生成的重要中间产物。结果表明，甲醛对残余燃料的相对生成量通过甲醛的链反应终止作用决定了冷焰氧化的程度。少

项目成果

Yamada, H.: "Simplified Oxidation Mechanism of DME Applicable for Compression Ignition"SAE paper 2003-01-1819. (2003)

Yamada, H.：“适用于压缩点火的 DME 的简化氧化机理”SAE 论文 2003-01-1819。

山田裕之: "ジメチルエーテルを用いた予混合圧縮自着火(HCCI)機関における低温酸化過程の機構検討"日本機会学会論文集. (掲載決定). (2003)

Hiroyuki Yamada：“使用二甲醚的均质压缩点火 (HCCI) 发动机的低温氧化过程的机理研究”，日本机械工程师学会论文集（2003 年出版）。

Non-linear pressure dependence of A-state fluorescence lifetime of formaldehyde

甲醛 A 态荧光寿命的非线性压力依赖性

• 发表时间: 2005
• 期刊: Appl.Phys.B accepted
• 作者: Y.Yamasaki

A Study of Low-Temperature Oxidation of Dimethyl Ether in an Engine Using Quadrupole Mass Spectrometer

利用四极杆质谱仪研究发动机中二甲醚的低温氧化

• 发表时间: 2002
• 期刊: Trans.Society of Automobile Engineering of Japan 33-4
• 作者: H.Yamada

F.Itoh: "Chemical Kinetics of Alkenes with O(^3P) Atom at High Temperature"Proc. 23th International Symp. on Shock Waves. 303-310 (2002)

F.Itoh：“高温下 O(^3P) 原子烯烃的化学动力学”Proc。