Investigation of Micro-Scale Structure in Turbulent Premixed Flames and Its Control

湍流预混火焰微尺度结构研究及其控制

• 批准号: 12305015
• 负责人: MIYAUCHI Toshio
• 金额: $ 24.94万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305015/
• 关键词: Turbulent Combusion; Premixed Flames; Micro-Scale Structure; Direct Numerical Simulation; Laser Diagnostics; 予混合火炎

In this study, micro-scale structures of turbulent premixed flames are investigated to develop effective control schemes for turbulent combustion observed in gas turbine combustors. Direct numerical simulations (DNS) of hydrogen/air and hydrocarbon/air turbulent premixed flames are conducted by taking into account detailed kinetic mechanisms and temperature dependence of transport and thermal properties. To investigate the micro-scale structure of turbulent premixed flames experimentally, laser diagnostics such as OH and CH simultaneous PLIF and time-series PIV are also developed. From the results of DNS and CH/OH PLIF, effects of turbulence characteristics such as turbulence intensity and length scale on the micro-scale structure, NOx formation mechanism, sound generation mechanism from combustors and the real three-dimensional feature of turbulent premixed flames are shown. The obtained results also confirmed the turbulent combustion diagram which has been proposed only from dimensional arguments. To develop the control schemes for turbulent combustion based on coherent fine scale structure of turbulence, DNS of turbulent premixed flames in homogeneous rotating turbulence are conducted. It has been shown that micro-scale structure of premixed flame and turbulent burning velocity depend on the direction of the system rotation, which suggests that turbulent combustion can be controlled based on the micro-scale structure. By constructing turbulent swirl burner, the relation between micro-scale flame structure and pressure fluctuation in combustor is investigated. The pressure fluctuation is related with flame structure in micro scales and controls of micro-scale structure by introducing second fuel injection into recirculation zone are conducted. The results show that the control of micro-scale structure by second fuel injection can suppress the combustion noise and NOx emission.

本文研究了湍流预混火焰的微尺度结构，为燃气轮机燃烧室中观察到的湍流燃烧制定了有效的控制方案。对氢/空气和碳氢化合物/空气湍流预混火焰进行了直接数值模拟，并考虑了其详细的动力学机制和传递和热性质的温度依赖性。为了实验研究湍流预混火焰的微观结构，还开发了OH和CH同步PLIF和时间序列PIV等激光诊断方法。从DNS和CH/OH PLIF实验结果出发，揭示了湍流强度和长度尺度等湍流特性对湍流预混火焰微观结构、NOx形成机理、燃烧室生声机理以及湍流预混火焰真实三维特征的影响。所得结果也证实了仅从量纲上提出的紊流燃烧图。为了开发基于湍流相干细尺度结构的湍流燃烧控制方案，对均匀旋转湍流中湍流预混火焰进行了数值模拟。研究表明，预混火焰的微尺度结构和湍流燃烧速度与系统旋转方向有关，表明可以根据微尺度结构控制湍流燃烧。通过构建紊流旋流燃烧器，研究了微尺度火焰结构与燃烧室压力波动的关系。在微观尺度上，压力波动与火焰结构有关，通过在再循环区引入二次喷油来控制微观尺度结构。结果表明，通过二次喷油对微细尺度结构进行控制，可以有效抑制燃烧噪声和NOx排放。

项目成果

M.Tanahashi, T.Saito, T.Miyauchi: "Direct Numerical Simulation of Methane-Air Turbulent Premixed Flames with Detailed Kinetic Mechanism"8th Int.Conf.Numerical Combustion. (2000)

M.Tanahashi、T.Saito、T.Miyauchi：“具有详细动力学机制的甲烷-空气湍流预混火焰的直接数值模拟”第八届国际燃烧大会。

相澤哲哉, 小酒英範, 松井幸雄: "レーザー誘起蛍光・赤熱法による非定常噴霧火炎内すす生成過程の2次元可視化"日本機械学会論文集(B編). 69巻680号. 981-987 (2003)

Tetsuya Aizawa、Hidenori Kozake、Yukio Matsui：“使用激光诱导荧光和白炽光方法对不稳定喷雾火焰中烟灰形成过程的二维可视化”，日本机械工程师学会汇刊（编辑 B）。 ，第 680.981-987 号（2003 年）

斎藤敏彦, 店橋護, 宮内敏雄: "メタン・空気乱流予混合火炎の局所火炎構造とNO生成機構"日本燃焼学会誌. (印刷中). (2003)

Toshihiko Saito、Mamoru Storehashi、Toshio Miyauchi：“甲烷-空气湍流预混合火焰的局部火焰结构和 NO 产生机制”日本燃烧学会杂志（2003 年）。

Y.Nada, M.Tanahashi, T.Miyauchi: "Three-Dimensional Structure of H2-Air Turbulent Premixed Flames"Int.Symp.Turbulence, heat and mass transfer. (印刷中). (2003)

Y.Nada、M.Tanahashi、T.Miyauchi：“H2-空气湍流预混合火焰的三维结构”Int.Symp. 湍流、热和质量传递（印刷中）。

G. Choi, M. Tanahashi, Y. Li and T. Miyauchi: "Flame structure and kinetic mechanisms in hydrogen-air diffusion flame"9th Int. Conf. Numerical Combustion. 407-408 (2002)

G. Choi、M. Tanahashi、Y. Li 和 T. Miyauchi：“氢-空气扩散火焰中的火焰结构和动力学机制”第 9 期 Int.