研究目的
Developing a novel cross-band laser absorption spectroscopy technique for quantitative measurements of gas temperature and carbon monoxide (CO) in high-pressure, high-temperature rocket combustion flows.
研究成果
The cross-band infrared laser absorption sensing strategy successfully measured temperature and species concentration in high-pressure rocket combustion environments, demonstrating new limits in pressure capability for non-intrusive combustion diagnostics. The technique provides a useful method for evaluating combustion efficiency/performance at practical rocket operating conditions.
研究不足
The technique faces challenges at very high pressures due to collisional broadening and blending of the spectra, which reduces differential absorption and increases interference. Additionally, the method requires accurate spectroscopic models to account for line-mixing effects at high gas densities.
1：Experimental Design and Method Selection:
The study employs a cross-band laser absorption spectroscopy technique to probe rovibrational transitions in both the fundamental and first overtone bands of CO. Scanned-wavelength modulation spectroscopy methods are integrated for noise rejection.
2：Sample Selection and Data Sources:
Experiments were conducted on a single-element-injector rocket combustor with RP-2/GOx and CH4∕GOx propellant combinations at pressures up to 75 bar and 105 bar.
3：List of Experimental Equipment and Materials:
DFB quantum cascade laser (QCL) and DFB diode laser for probing CO's fundamental and first overtone bands, respectively. Hollow-core fiber for light delivery, sapphire windows for optical access, and InGaAs and MCT photovoltaic detectors for signal detection.
4：Experimental Procedures and Operational Workflow:
The optical setup included mechanical mounts for beam alignment, a N2 purge system to mitigate water vapor interference, and a He purge system to minimize soot deposition on windows. Measurements were taken across a 2.5 cm transverse optical pathlength.
5：5 cm transverse optical pathlength.
Data Analysis Methods:
5. Data Analysis Methods: A modified spectroscopic model accounting for line-mixing effects was developed to interpret the signals from the first overtone bandhead. Temperature and CO mole fraction were inferred by comparing measured WMS-2f/1f signals to simulations.
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