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In combustion engines, turbulence generated by flow field motion in the cylinder affects the propagating flame initiated by a spark plug, resulting in the increase of heat release rate and thus power available from an engine of a given size. In this context the modeling and prediction of turbulent flame properties are of importance for smart control of engine performance. In the present work, turbulent burning velocities of outwardly propagating premixed flames for methane and propane are investigated under the framework of the flamelet concept. The primary objective of the present paper is to study experimentally the turbulent burning velocities and derive the fundamental equations.