An Experimental Study on Local Flame Displacement Velocity of Hydrogen added Ultra-Lean Propane-Dilution Gas Premixed Turbulent Flames

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  • 水素添加超希薄プロパン－希釈ガス予混合乱流火炎の局所燃焼速度特性に関する実験的研究

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<p>This experimental study was performed to investigate directly the local flame properties of turbulent propagating flames at the same weak turbulence condition for hydrogen added ultra-lean propane mixtures. A two-dimensional sequential laser tomography technique was applied to obtain the relationship between the flame shape and the flame displacement in a constant-volume vessel. The local flame displacement velocity SF, curvature and stretch of turbulent flames was quantitatively measured as key parameters of local burning characteristics. It was found that the trends of the mean values of measured SF ,SF,m , with respect to hydrogen additional rates correspond well its turbulent burning velocity. The local burning velocity at the part of turbulent flames with positive stretch and curvature due to the Ma, SLt, attempted to be estimated quantitatively. As a result, a quantitative relationship between the estimated SLt and the SF,mu at positive stretch and curvature of turbulent flames could be observed only for mixtures with Le>1.</p>

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