Measurements in wrinkled flame by laser Doppler velocimetry and laser tomography

This paper deals with the application of laser Doppler velocimetry when associated with laser tomography to weakly stretched propagating downwards flames. Its main objective is the determination of the Markstein number representing sensitivity to strain and curvature of the premixed wrinkled flames.The measured quantities are the flow field velocity of the unburned gas, the normal flame velocity and the amplitude of the flame front.The experimental data are obtained for methane and propane laminar flames stabilized in a sinusoidally (spatially) modulated steady flow. An original method, using the tomography laser technique is developed to stabilize intrinsically the flame. The results obtained are in good agreements with those found in the literature, confirming the dependence of Markstein number values on value of Lewis number.

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