Experimental and Numerical Study on NOx reduction in a Swirl Burner

旋流燃烧器中氮氧化物还原的实验与数值研究

• 批准号: 11450378
• 负责人: YAMASAKI Nobuhiko
• 金额: $ 9.79万
• 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: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450378/
• 关键词: Gas Turbine Engine; Swirl Burner; NOx reduction; Diffusion Flame; LES; Gas Chromatograph; Thermocouple; ガスターピンエンジン

Hydrogen/air diffusion flame with swirl is investigated experimentally and numerically to study the effects of the swirl number on NOx reduction.Experiments show that as the swirl number increases, (a) the local temperature in a flame decreases, and as a result (b) the local NOx concentration decreases, furthermore, (c) unburnt fuel is not observed although the local temperature decreases, and (d) small area having high temperature appears around the flame tip while in other area the local temperature decreases as the swirl number increases.Large eddy simulations with axi-symmetric formulation and with 11 chemical species and 23-step elementary reaction model qualitatively simulate the experimental results of (a) to (c), without turbulent reaction model. Large-scale recirculation zone is appeared in the numerical simulation as the swirl number increases. The recirculation zone is not appeared when the q-w turbulence model is used.In addition, the flow inside the model burner is simulat … More ed numerically, and it is found that the model burner produces negative pressure area at the burner outlet when the swirl number increases. That is, constant pressure assumption at the burner outlet is wrong when the calculation domain is taken to be downstream of the burner outlet.Methane/air diffusion flame with swirl is also investigated experimentally. Experiments show that as the swirl number increases, (A) the local temperature in a flame decreases, however, (B) the local NOx concentration is unchanged and (C) unburnt fuel increases as the swirl number increases. The behavior of the methane air flame is quite different from those of the hydrogen/air flame.In some cases, the numerical results with second order discretization in space and time and with Harten-Yee upwind TVD scheme show that the flame is Laminar although the experimental results show that the flame has turbulent-like behavior. This inconsistency between the simulations and the experiments appears to be overcome by applying the higher order space discretization and by applying low dissipative characteristic filter instead of applying the TVD scheme. However, details are under study now. Less

通过实验和数值模拟研究了旋流数对氢/空气扩散火焰中NOx还原的影响.实验结果表明，随着旋流数的增加，（a）火焰中局部温度降低，（B）局部NOx浓度降低;（c）虽然局部温度降低，但没有未燃燃料，（d）火焰尖端附近出现小的高温区域，而其他区域的局部温度随着旋流数的增加而降低.采用轴对称公式和11种化学组分和23步基元反应模型的大涡模拟定性地模拟了（a）到（c）的实验结果，没有湍流反应模型。随着旋流数的增加，数值模拟中出现了大尺度回流区。采用q-w湍流模型时，燃烧器内部没有出现回流区， ...更多信息 艾德的数值模拟，发现随着旋流数的增加，模型燃烧器在燃烧器出口处产生负压区。本文还对旋流甲烷/空气扩散火焰进行了实验研究。实验表明，随着旋流数的增加，（A）火焰中局部温度降低，（B）局部NOx浓度不变，（C）未燃燃料量增加。甲烷/空气火焰的行为与氢气/空气火焰的行为有很大的不同，在某些情况下，虽然实验结果表明火焰具有类似层流的行为，但在空间和时间上采用二阶离散和Harten-Yee迎风TVD格式的数值结果表明火焰是层流的。这种模拟和实验之间的不一致似乎可以通过应用高阶空间离散化和应用低耗散特性滤波器而不是应用TVD方案来克服。不过，有关细节现正研究中。少

项目成果

T.Sumi and N.Yamasaki: "Non-premixed Jet Diffusion Flames with Swirl"Memoirs of the Faculty of Engineering Kyushu University. 60-4. 155-172 (2000)

T.Sumi 和 N.Yamasaki：“带有漩涡的非预混射流扩散火焰”九州大学工学部回忆录。

猪口雄三,山崎伸彦 ら5名: "水素/空気スワールバーナにおけるNOx生成の抑制"第38回燃焼シンポジウム講演論文集. 105-106 (2000)

Yuzo Inoguchi、Nobuhiko Yamazaki 等 5 人：“氢/空气旋流燃烧器中 NOx 生成的抑制”第 38 届燃烧研讨会论文集 105-106 (2000)。

T.Sumi, N.Yamasaki, and M.Namba: "Effects of Swirl on Diffusion Flames"Proc.of 13th Int.Sympo.on Air Breathing Engines (ISABE). 99-7208 (CD-ROM). (1999)

T.Sumi、N.Yamasaki 和 M.Namba：“涡流对扩散火焰的影响”Proc.of 13th Int.Sympo.on Air Breathing Engines (ISABE)。

Y.Inokuchi, N.Yamasaki, M.Namba et al.: "Mixing Enhancement with Streamwise Vortices"Proc.of 13th Int.Sympo.on Air Breathing Engines (ISABE). 99-7158 (CD-ROM). (1999)

Y.Inokuchi、N.Yamasaki、M.Namba 等人：“混合增强与流向涡流”Proc.of 13th Int.Sympo.on Air Breathing Engines (ISABE)。

Y.Inokuchi,H.Chiba,N.Yamasaki and M.Namba: "Mixing Enhancement with Streamwise Vortices"Proc.of 13th Int.Sympo. On Air Breathing Engines(ISABE). 99-7158. CD-ROM (1999)

Y.Inokuchi、H.Chiba、N.Yamasaki 和 M.Namba：“混合增强与流向涡流”Proc.of 13th Int.Sympo。