INVESTIGATION OF FLAME-FRONT INSTABILITY MECHANISM BY PREFERENTIAL DIFFUSION EFFECT FOR TURBULENT COMBUSTION AT ELEVATED PRESSURE

高压湍流燃烧优先扩散效应研究火焰前不稳定机制

• 批准号: 15360113
• 负责人: KIDO Hiroyuki
• 金额: $ 9.09万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360113/
• 关键词: Premixed Turbulent Combustion; Local Burring Velocity; Flame Configuration; Preferential Diffusion; Laser Tomography; Markstein Number

This study was carried out comprehension of turbulent combustion and its local combustion characteristics experimentally for more various mixtures and elevated-pressure conditions. Their characteristics were also examined by the concept of the sensitivity of flame stretch or curvature on the burning velocity as well as the preferential diffusion effect, in order to investigate the mechanism of flame-front instabilities on turbulent flames. Additionally, an attempt was made to establish a general-purpose model of turbulent burning velocity. The main conclusions are as follows.・ In order to investigate the local burning velocity characteristics of the turbulent flame of hydrogen added methane or propane mixtures, the local flame displacement velocity S_F was measured directly with using two-dimensional sequential tomograms. S_F plays clearly an important role in the turbulent burning velocity. The burning velocity of turbulent flames S_<Lt> estimated by using the Markstein number attempted to be estimated. A quantitative relationship between S_F and S_<Lt> can be observed only for rich hydrogen or methane and lean propane mixtures.・ Turbulent burning velocity and local burning velocity characteristics for various hydrogen mixtures were examined experimentally. The mean local burning velocities S_L, estimated by taking account of preferential diffusion effect, were estimated. Quantitative accuracy of the proposed simple model for hydrogen mixtures can be clearly more improved by using S_L taking account of u'/S_<L0> as well as φ.・ Finally, effects of the initial pressure on local burning velocities and local flame configurations were examined. There is a possibility that the increase in the initial pressure does not increase the local burning velocity but increase the flame-surface area of turbulent flames.

本研究通过实验对多种混合气和高压条件下的湍流燃烧及其局部燃烧特性进行了研究。为了研究湍流火焰中火焰阵面不稳定性的机理，本文还利用火焰延伸或曲率对燃烧速度的敏感性以及优先扩散效应的概念对它们的特性进行了研究。此外，还试图建立一个通用的湍流燃烧速度模型。主要结论如下：·为了研究掺氢甲烷或丙烷湍流火焰的局部燃烧速度特性，采用二维连续层析成像技术直接测量了掺氢甲烷或丙烷湍流火焰的局部火焰位移速度SF。S_F在湍流燃烧速度中起重要作用。尝试用Markstein数估算湍流火焰的燃烧速度S_<Lt>（？）只有<Lt>在富氢或富甲烷和贫丙烷的混合物中才能观察到S_F和S_之间的定量关系。实验研究了不同氢混合物的湍流燃烧速度和局部燃烧速度特性。估算了考虑优先扩散效应后的平均局部燃烧速度S_L。采用S_L同时考虑u '/S_2和φ，可以明显提高所提出的氢混合物简单模型的定量精度<L0>。最后，研究了初始压力对局部燃烧速度和局部火焰形态的影响。有一种可能性，即初始压力的增加并不增加局部燃烧速度，但增加湍流火焰的火焰表面积。

项目成果

A study on premixed turbulent combustion of hydrogen including hydrocarbon

• DOI: 10.2514/6.2003-4638
• 发表时间: 2003-07
• 作者: H. Kido;M. Nakahara;K. Nakashima

水素混合気の乱流火炎形状に関する実験的検討

氢气混合物湍流火焰形状实验研究

• 发表时间: 2006
• 期刊: 自動車技術会論文集 37・2
• 作者: 中原 真也

Influence of Dilution Gas on the Configuration Characteristics of Premixed Turbulent Propagating Flames of Hydrogen Mixtures

稀释气体对氢气混合物预混湍流传播火焰构型特性的影响

• 发表时间: 2004
• 期刊: Journal of Korean of Marine Engineers Vol.28, No.4
• 作者: 中原 真也;中原 真也 その他3名;城戸 裕之;M.Nakahara;M.NAKAHARA;N.Nakahara;M.Nakahara;M.Nakahara;中原 真也;M.Nakahara;M.Nakahara et al.;中原 真也 その他2名;M.Nakahara et al.;M.Nakahara et al.;中原 真也 その他2名;J.H.Kim
• 通讯作者: J.H.Kim

Turbulent Burning Velocity of Lean Hydrogen Mixtures

贫氢混合物的湍流燃烧速度

• 发表时间: 2003
• 期刊: 2003 JSAE/SAE Intemational Spring Fuels&Lubricants Meeting SAE 2003-01-1773
• 作者: 中原 真也;中原 真也 その他3名;城戸 裕之;M.Nakahara;M.NAKAHARA;N.Nakahara;M.Nakahara;M.Nakahara;中原 真也;M.Nakahara;M.Nakahara et al.;中原 真也 その他2名;M.Nakahara et al.;M.Nakahara et al.;中原 真也 その他2名;J.H.Kim;H.Kido;H.Kido;J.H.Kim;H.Kido;H.Kido;H.Kido
• 通讯作者: H.Kido

A study on the local flame displacement velocity of premixed turbulent flames

• DOI: 10.1299/jsmeb.48.164
• 发表时间: 2005-02
• 期刊: Jsme International Journal Series B-fluids and Thermal Engineering
• 作者: M. Nakahara;H. Kido;K. Nakashima