Study on influencing factors of deflagration characteristics of hydrogen-blended natural gas in open space
In order to deepen the understanding on the deflagration characteristics of natural gas with low hydrogen blending ratio in open space,the experiments were carried out on the mixture of methane and hydrogen with different hydrogen blending ratios when the equivalence ratio was 1.1,and the influence of hydrogen blending ratio and turbulence disturbance on the flame morphology,flame propagation speed,and deflagration overpressure was analyzed.The results show that the hydrogen blending ratio has a unidirectional promotion effect on the reaction,and with the increase of hydrogen blending ratio,the flame morphology of hydrogen-blended natural gas changes significantly,the flame propagation speed increases,the peak deflagration overpressure accelerates,and the propagation ability of deflagration shock wave is enhanced;The initial turbulence plays a bi-directional role in promoting and inhibiting the reaction.The peak deflagration overpressure of hydrogen-blended natural gas in open space has a positive proportional linear relationship with the maximum flame speed,and the peak deflagration over-pressure can be estimated from the maximum flame speed with the help of the fitting formula.The research results can provide theoretical support for the application of hydrogen-blended natural gas pipelines with low hydrogen blending ratio.
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