Super-Mixing High-Speed Combustion Enhanced by Unsteady Fuel Injection with Timescale of Micro Shear Layer

微剪切层时标非稳态燃油喷射增强超混合高速燃烧

• 批准号: 10650202
• 负责人: YOSHIDA Hideo
• 金额: $ 2.56万
• 依托单位: KYOTO UNIVERSITY (1999)Tokyo Institute of Technology (1998)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650202/
• 关键词: Combustion; Mixing Enhancement; Micro Shear Layer; Unsteadiness; Acoustic Excitation

In order to embody extremely high-speed diffusion combustion, micro shear layers formed near the planar nozzle of 0.5。ォ1 mm in width were excited by acoustic resonance. For nonreacting jet experiments, Schlieren visualization and flow measurement by a hot-wire anemometer show that the marked amplification of turbulence is induced by the acoustic excitation with the frequencies proportional to the nozzle-exit velocity. Analogously, visual observation, temperature and concentration measurements for the reacting jet demonstrate that combustion is much enhanced under the resonant condition. For the planar jets injected from the nozzles of 0.5。ォ1 mm in width, acoustic excitation was applied. In both the nonreacting and reacting jets, resonant phenomena were clearly confirmed. The Strouhal number for the resonant condition was almost constant for each case, but varies largely depending on reacting or nonreacting conditions. The dramatic changes observed in the present experiments are ascribed to the combination of acoustic excitation and micro shear layers.

为了体现极高速的扩散燃烧，在0.5的平面喷管附近形成微剪切层。孔径为1mm的金属被声共振激发。在非反应射流实验中，纹影显示和热线风速仪的流量测量表明，声激励引起湍流的明显放大，其频率与喷嘴出口速度成正比。同样，对反应射流的目视观察、温度和浓度测量表明，在共振条件下，燃烧大大增强。对于从0.5的喷嘴喷射的平面射流。宽度为1 mm，施加声激励。在非反应射流和反应射流中，共振现象都得到了明确的证实。谐振条件下的斯特罗哈尔数在每种情况下几乎都是恒定的，但在反应或非反应条件下变化很大。实验中观察到的剧烈变化归因于声激励和微剪切层的共同作用。

项目成果

Hide Yoshida: "Super-Mixing Combustion Enhanced by Resunance between Micro Shear Layer and Acoustic excitatiun"Proc.3rd Int.Sympo.on Turb.Heat Mass Trans.. 24-31 (2000)

吉田秀：“微剪切层与声激励之间的共振增强了超混合燃烧”Proc.3rd Int.Sympo.on Turb.Heat Mass Trans.. 24-31 (2000)

Hideo Yoshida: "Super-Mixing Combustion Enhanced by Resonance between Micro Shear Layer and Acoustic Excitation"Proc.3rd Int.Sympo.on Turb.Heat Mass Trams.. 973-980 (2000)

Hideo Yoshida：“微剪切层和声学激励之间的共振增强了超混合燃烧”Proc.3rd Int.Sympo.on Turb.Heat Mass Trams.. 973-980 (2000)

H. Yoshida, M. Koda, Y. Ooishi, K. P. Kobayashi, and M. Saito: "Super-Mixing Combustion Enhanced by Resonance between Micro Shear Layer and Acoustic Excitation"Turbulence, Heat and Mass Transfer 3 (Proceedings of the Third International symposium on Turbu

H. Yoshida、M. Koda、Y. Ooishi、K. P. Kobayashi、M. Saito：“微剪切层与声学激励之间的共振增强的超混合燃烧”湍流、传热传质3（第三届国际研讨会论文集）