LIF measurements of turbulent premixed flames in a high pressure environment
The effects of pressure on OH-LIF characteristics of laminar and turbulent premixed flames were investigated. OH-LIF experiments were performed for methane-air mixtures using burner flames stabilized in high-pressure chambers. An OPO tunable laser pumped by a Nd-YAG laser were used and A{sup 2}{Sigma}{sup +}-X{sup 2} II (0,0) and (1,0) band of OH radical were measured. For laminar flames, OH-LIF excitation spectrum was measured by scanning the laser wavelength at pressures up to 1.0 MPa. The overlap-integral profiles between Gaussian profiles of the laser and Voigt profiles of the absorption line were calculated, and the effects of pressure and laser linewidth on FWHM and intensities of the LIF excitation spectrum were compared with experimental data. Results show that the effects of pressure on the FWHM and peak intensity of overlap integral profiles agree qualitatively with those on the measured LIF excitation spectrum, indicating that the decrease in LIF intensity of the flame at high-pressure is dominated by the broadening of the absorption line shapes. The LIF intensity decreases with increasing linewidth of the laser. A narrow-band laser is effective in order to obtain higher LIF intensity at ordinary pressure but the linewidth of the laser has no significant effect at high pressures.
- Research Organization:
- Tohoku Univ., Katahira, Sendai (JP)
- OSTI ID:
- 20019108
- Resource Relation:
- Conference: 5th ASME/JSME Thermal Engineering Joint Conference, San Diego, CA (US), 03/14/1999--03/19/1999; Other Information: 1 CD-ROM. Operating Systems required: Windows i386, i486, Pentium Pro, MS Windows 3.1, 95, or NT3.51, 8MB Ram, MacIntosh and Power MacIntosh with a 68020 or greater processor, System software version 7.1, 3.5 MB RAM (5 MB for PowerMac), 6 MB available hard-disk space, Unix; PBD: 1999; Related Information: In: Proceedings of the 5th ASME/JSME thermal engineering joint conference, [3600] pages.
- Country of Publication:
- United States
- Language:
- English
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