A Study on Modeling of Turbulent Burning Velocity Based on Local Burning Velocity for Hydrogen Mixtures

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  • 水素混合気の局所燃焼速度に基づく乱流燃焼速度の整理に関する研究

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This study is made to attempt to establish a prediction model of tubulent burning velocity for hydrogen mixtures based on the local burning velocity of turbulent flames instead of laminar burning velocity. The turbulent burning velocity characteristics of the specific mixtures having the same laminar burning velocity SL0 with different equivalence ratio φ are examined experimentally at a constant volume vessel (φ=0.3-3.6 at the maximum, SL0=10-50cm/s). The mean local burning velocity SL of turbulent flames is also determined by using our proposed method which takes the preferential diffusion effect into consideration. It is found that the lower the equivalence ratio is, the higher the turbulent burning velocity becomes and the more extended the quenching limit is. SL/SL0 for each φ of hydrogen mixture has a tendency to increase or decrease with u'/SL0, as compared with hydrocarbon mixtures. Therefore, the SL for hydrogen mixtures needs to take account of u' as well as φ and SL0. The quantitative accuracy of our proposed model for hydrogen mixtures is improved by using SL based on φ and u'/SL0.

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