Study of Pollutant Formation and Its Control in the Non-Uniform Combustion

非均匀燃烧污染物生成及其控制研究

• 批准号: 05452159
• 负责人: IKEGAMI Makoto
• 金额: $ 4.54万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452159/
• 关键词: Non-Unifrom Combustion; Turbulent Mixing; Nitrogen Oxides; Chemical Kinetics; Two-Stage Combustion; Jet Diffusion Flame; Particle Image Velocimetry; Laser Light-Sheeting Method; バロクリニック効果; 粒子画像流速測定

This study aims at the clarification of the non-uniform combustion process in highly-turbulent flowfields for controlling pollutant formation during combustion. The contents of the prsent study are summarized as follows :1.Turbulence in jet diffusion flames was investigated based on observations of instantaneous LLS (laser-light sheet method) images of turbulent eddies. Results show that only larger eddies can be seen mainly on the azimuthal cross-section, and that mixing between fuel and air mainly proceeds by stretching of the interfacial layr during development of vortex rings due to an ejecting flow. Furthermore, the capability of inducing vortices near the zone of a higher density gradient due to baroclinic effect was discussed using a vorticity-transport equation.2.Particle image velocimetry (PIV) for measuring velocity vectors in a turbulent flow was developed based on a two dimensional cross-correlation coefficient between two images with a small time interval. An accuracy of P … More IV was assessed at probable errors using the simulated images. The measured results in jets and jet flames reveal that vortex rings produced associated with the unsteady motion in the shear layr promote the mixing, whereas in the reacting region fluctuating motions are laminarized due to an increase in temperature, causing the complicated pattern of soot layrs in the downstream of flame.3.Production and destruction of nitrogen oxides in the two-stage combustion was investigated based on a detailed chemical kinetics. From the analysis of dilution processes of methane-air fuel-rich burnt gas, it is shown that fast mixing due to strong turbulence causes a considerable NOx reduction, and that a further reduction can be achieved if the temperature decreases with the volume expansion prior to the heat-release due to the dilution. In addition, reaction paths into NOx formation were discussed in the conditions of different presure and air-temperature, and contributions of individual elementary reactions were given by the integration of each NO formation rate. Less

本研究旨在阐明强湍流流场中的非均匀燃烧过程，以控制燃烧过程中污染物的形成。主要研究内容如下：1.利用激光片法(LLS)获得的湍流瞬时图像，对射流扩散火焰中的湍流进行了研究。结果表明，只有较大的涡流主要分布在方位向截面上，喷流在涡环发展过程中，燃料与空气的混合主要是通过界面层的拉伸进行的。此外，还利用涡量输运方程讨论了斜压效应在密度梯度较高区域附近产生涡旋的能力。2.基于小时间间隔两幅图像之间的二维互相关系数，发展了测量湍流速度矢量的粒子图像测速仪(PIV)。P-…的一种精度使用模拟图像在可能的误差处评估更多的IV。在射流和射流火焰中的测量结果表明，与剪切层的非定常运动有关的涡环促进了混合，而在反应区，由于温度的升高，脉动运动被分层，导致了火焰下游复杂的碳烟层。3.基于详细的化学动力学，研究了两段燃烧中氮氧化物的生成和破坏。对甲烷-空气富燃料燃烧气体稀释过程的分析表明，由于强湍流的快速混合，NOx的还原效果显著，在稀释放热之前，如果温度随体积膨胀而降低，则可以实现进一步的还原。此外，还讨论了在不同压力和空气温度条件下生成NOx的反应途径，并通过对各个NO生成速率的积分给出了各个基元反应的贡献。较少

项目成果

塩路昌宏: "相互相関PIVによる噴流火炎内ガス流動の解析" 第32回燃焼シンポジウム講演論文集. 434-436 (1994)

Masahiro Shioji：“使用互相关 PIV 分析喷射火焰中的气流”第 32 届燃烧研讨会论文集 434-436（1994 年）。

M.Shoji: "Analysis of Gas Flows in a Trubulent Jet Flame using Cross-Correlation PIV" 32nd Symposium on Combus-tion. 434-436 (1994)

M.Shoji：“使用互相关 PIV 分析湍流射流火焰中的气流”第 32 届燃烧研讨会。

塩路 昌宏: "温度低下と希薄化を受ける燃焼ガスのNOx生成および分解" 日本機械学会講演論文集(関西支部第253回講演会). No.944-4. 209-211 (1994)

Masahiro Shioji：“经过温度降低和稀释的燃烧气体的NOx生成和分解”日本机械工程师学会会议记录（第253届关西分会）第209-211号（1994年）。

塩路 昌宏: "燃焼ガスの希薄化過程におけるNOxの生成および分解" 日本機械学会講演論文集(関西支部第70期定時総会講演会). No.954-2. (1995)

Masahiro Shioji：“燃烧气体稀释过程中NOx的生成和分解”日本机械工程师学会会议记录（第70届关西分会年会）（1995年）。

山田 修: "過濃および過薄ガスの混合を伴う燃焼における窒素酸化物の生成と分解" 日本機械学会関西支部第69期定時総会講演会. (発表予定). (1994)

Osamu Yamada：“涉及富气和贫气混合物的燃烧中氮氧化物的生成和分解”在日本机械工程学会关西分会第 69 届年度大会上的演讲（待发表）。