| Project/Area Number |
06650244
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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 | Nagoya University (1995)
Toyohashi University of Technology (1994) |
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Principal Investigator |
YOSHIKAWA Norihiko Nagoya University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60135423)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Laser Induced Fluorescence / Nitric Oxide / Combustion / Spectroscopy / Pollution Substance / CCD Camera |
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| Research Abstract |
A planar laser induced fluorescence technique for NO gas in burner flames is established for practical use. The electronic transition is induced using the (0,0) Q_1 (18) absorption band at 225.835nm for the detection of (0,2) band fluorescence at 247.1nm. The calibration of the laser sheet intensity is obtained using 10ppm NO sample gas in nitrogen. The linear relation between the laser intensity and the LIF intensity is ascertained. The experiments for laminar and turbulent premixed methane-air flames show that the LIF signal level is high in the relatively large zones behind the flame reaction front. In laminar diffusion flames of methane and hydrogen, LIF signal is observed even in fuel zone near the burner exit. The possibilities of other signals of O_2, PAH,and fuels are rejected through a systematic check. The reason is found that the quenching effects to NO is extremely reduced in methane and hydrogen gases. Very small concentration of NO,perhaps less than ppm order, is diffused from the reaction zone into the burner exit. The LIF detection for NO_2 at 479.5nm is also tried using 439.0nm excitation laser beam. The detection in flames is not obtained. The lower detection limit of nitrogen diluted NO_2 sample gas is 2ppm.
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