An Experimental Study on Local Flame Displacement Velocity of Hydrogen Added Methane Premixed Turbulent Flames

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  • 水素添加メタン予混合乱流火炎の局所燃焼速度特性に関する実験的検討
  • スイソ テンカ メタン ヨ コンゴウ ランリュウ カエン ノ キョクショ ネンショウ ソクド トクセイ ニ カンスル ジッケンテキ ケントウ

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The influence of the addition of hydrogen to methane mixtures on its local burning velocity has been investigated directly. Hydrogen added lean and rich methane mixtures having nearly the same laminar burning velocity with different rates of addition of hydrogen δH were prepared.A two-dimensional sequential laser tomography technique was used to obtain the temporal statistical relationship between the flame shape and the flame displacement. The local flame displacement velocity SF and curvature of turbulent flames were quantitatively measured as the key parameters on turbulent combustion. Additionally, the Markstein number Ma was obtained from outwardly propagating spherical laminar flames, in order to examine the effect of positive stretch on burning velocity. It was found that the trends of the mean values of measured SF with respect to δH and the equivalence ratio φ corresponded well the turbulent burning velocity. The trends of Ma with respect to δH and φ could possibly explain qualitatively the local burning velocity and turbulent burning velocity.

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