| Project/Area Number |
04650184
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
YOSHIKAWA Norihiko Toyohashi Univ.of Tech., Eng.Faculty, Associate Prof., 工学部, 助教授 (60135423)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Laser / Fluorescence / Combustion / Liquid Fuel |
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| Research Abstract |
1.Planar Measurement Using CCD Camera
An experimental technique of planar measurement with high spatial resolution are developed. Several important aspects of the fundamental techniques are carefully examined through the LIF measurement of OH radicals in flames. The spatial resolution of 10mum can be achieved, and the thickness of a laminar methane-air flame is determined 0.4mm. The strong noise effects of the image intensifier can be removed : integration of 1000-1500 times of the instantaneous measurements is required to ensure quanitatively accurate profiles of LIF intensities ; a smoothing techniques of 7x7 or 9x9 filter functions are introduced to eliminate the spatial high-frequency noise in an instantaneous picture of turbulent flames.
2.Identification of Acetylene and Other Hydrocarbons
A line of 215.9nm is used for the detection of C_2H_2. At high pressure conditions about 1atm, C_2H_2 photochemically dissociates into C_2, and the C_2 Swan band spectra above 300nm region can be used to detect the acetylene. At low pressure conditions typically in a C_2H_2-Air premixed flame at 105Torr, the LIF spectra of acetylene itself are observed in 215-216.5nm. A similar experiment of two-photon absorption of C_2H_4 in flames at 1atm was tried using 300-320nm lines, since C_2H_4 has a strong absorption band below 190nm. Neither LIF nor Swan band could be detected. More careful examinations on effective absorption lines are required.
3.Future Works
The measurements were not successful due to the very strong quenching effects in LIF technique at atmospheric pressures. Studies of low pressure flames are expected for ensuring the signal detections, though the direct quantitative comparison with the real conditions at higher pressures can not be achieved.
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