研究目的
To demonstrate the application of mid-infrared polarization spectroscopy (IRPS) for quantitative measurements of species concentrations and temperature in a low pressure flame.
研究成果
The study demonstrated the potential of IRPS for sensitive detection of hydrocarbon species in laminar flames and for quantitative measurements of temperatures and species mole fractions. The technique shows promise for diagnostics in biomass gasification, catalysis, and other harsh environments. Future work is needed to improve the accuracy of temperature measurements and to investigate the technique's performance under different pressures.
研究不足
The main uncertainty in the measured mole fractions comes from the temperature uncertainty, which affects the simulated absorption cross-section and the temperature dependence of the signal. The experimental setup did not include a heating device inside the low pressure chamber for high-temperature measurements at atmospheric pressure.
1：Experimental Design and Method Selection:
The study utilized mid-infrared polarization spectroscopy (IRPS) for nonintrusive in situ detection of CH4, C2H2, and C2H6 in a low pressure flame. The flame was stabilized on a McKenna-type porous plug burner. Temperature measurements were conducted using the line ratio of temperature sensitive H2O spectral lines.
2：Sample Selection and Data Sources:
A rich DME/O2/Ar flame (Φ=1.87) at 37 mbar was studied. Spectral lines from CH4, C2H2, and C2H6 were identified by comparison with simulations using molecular parameters from the HITRAN and HITEMP databases.
3：87) at 37 mbar was studied. Spectral lines from CH4, C2H2, and C2H6 were identified by comparison with simulations using molecular parameters from the HITRAN and HITEMP databases.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a Nd:YAG laser, a dye laser, a LiNbO3 crystal for frequency mixing, a low pressure chamber, a McKenna-type porous plug burner, and an InSb detector.
4：Experimental Procedures and Operational Workflow:
The IRPS signal was recorded at different heights above the burner (HAB) for temperature and concentration measurements. Calibration measurements were performed in a low pressure N2 gas flow with known CH4 concentrations.
5：Data Analysis Methods:
The IRPS signal intensity was analyzed to determine species concentrations and temperature. The line ratio method was used for temperature measurements, and quantitative CH4 mole fractions were calculated using a calibration measurement.
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