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

• Project/Area Number: 10650202
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: KYOTO UNIVERSITY (1999); Tokyo Institute of Technology (1998)
• Principal Investigator: YOSHIDA Hideo Kyoto Univ., Fac. Eng., Professor, 工学研究科, 教授 (50166964)
• Co-Investigator(Kenkyū-buntansha): SAITO Motohiro Kyoto Univ., Fac. Eng., Instructor, 工学研究科, 助手 (90314236) ; KOBAYASHI Kenichi Meiji Univ., Fac. Eng., Assistant Professor, 理工学部, 選任講師 (10242273)
• Project Period (FY): 1998 – 1999
• Project Status: Completed (Fiscal Year 1999)
• Budget Amount: ¥4,000,000 (Direct Cost: ¥4,000,000); Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000); Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
• Keywords: Combustion / Mixing Enhancement / Micro Shear Layer / Unsteadiness / Acoustic Excitation

Research Abstract

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.

Research Products

• [Publications] 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)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] 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 Turbulence, Heat and Mass transfer, Nagoya April 2-6). 973-980 (2000)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] 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)