研究目的
Investigating the application of dual-pump coherent anti-Stokes Raman spectroscopy (CARS) to measure temperature and species concentrations in a hydrogen-fueled dual-mode scramjet combustor operating in ramjet mode, including the effects of spatial averaging and thermal nonequilibrium.
研究成果
Dual-pump CARS measurements in a dual-mode scramjet combustor revealed significant spatial averaging effects and thermal nonequilibrium in the hydrogen jet. A method for correcting spatial averaging errors was developed, improving the accuracy of temperature measurements. The study provides insights into the mixing and combustion processes in scramjet combustors and suggests future improvements for CARS spectral fitting to better account for spatial averaging.
研究不足
Spatial averaging errors due to the finite size of the CARS measurement volume relative to flame thickness can lead to significant biases in temperature and species concentration measurements. The method for correcting these errors has uncertainties and may not fully account for mixture fraction errors.
1：Experimental Design and Method Selection:
Dual-pump CARS was employed to measure temperature and species concentrations in a scramjet combustor. The technique involves crossing three laser beams at a focal point to generate a signal beam that carries spectral information of the gases.
2：Sample Selection and Data Sources:
Measurements were taken at multiple planes within the scramjet combustor to study the development of the fuel/combustion products plume.
3：List of Experimental Equipment and Materials:
A mobile laser cart containing an Nd:YAG laser, a narrowband dye laser, and a broadband dye laser was used. The system included focusing lenses, mirrors, and a spectrometer for signal analysis.
4：Experimental Procedures and Operational Workflow:
Laser beams were focused and crossed within the combustor, with the signal beam relayed to a spectrometer for analysis. Measurements were taken on a regular grid at each plane.
5：Data Analysis Methods:
Spectra were preprocessed and fitted to theoretical models to extract temperature and composition information. Spatial averaging effects were analyzed and corrected.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
