Experimental study on the effect of diluent gas on H2/CO/air mixture turbulent premixed flame |
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Affiliation: | 1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China;2. Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, Beijing, 100044, China |
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Abstract: | To study the effects of different diluents on the propagation characteristics of H2/CO/air mixture turbulent premixed flames, a series of experiments were carried out in a turbulent premixed flame experimental system. The effects of turbulence intensity (0.49–1.31 m/s), dilution gas content (10%, 20%, and 30%), hydrogen fraction (50%, 70%, and 90%), and equivalence ratio (0.6, 0.8, and 1.0) on the turbulent premixed flame were studied. The results show that with the increase in hydrogen fraction or turbulence intensity or equivalence ratio, the ST and ut increase at the same radius. Compared with N2 dilution, CO2 dilution showed a more obvious inhibition effect on ST. With the increase of Ka, ST;35mm/u’ gradually decreased, and the extent of ST;35mm/u’ decrease gradually became smaller. As the intensity of turbulence increases or the hydrogen fraction increases, the slope of ST,35mm/u’ with Da/Le gradually decreases. In the turbulence intensity range of this experiment, the ut,35mm/μl under nitrogen dilution condition has a larger floating range. The growth rate of ut,35mm/μl at a low equivalence ratio is significantly higher than that at a high equivalence ratio. |
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Keywords: | Syngas Turbulent premixed flame Diluent gas Propagation speed Burning velocity |
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