A flame is a self-sustaining propagation of a localized combustion zone at subsonic velocities. When a flame is initiated in a tube containing a combustible gas mixture, it propagates at certain speed. This speed is known as premixed laminar flame speed and is denoted by ‘SL’. To put in other words, premixed laminar flame speed is the speed at which reactants must be supplied to produce a stagnant flame. To obtain a numerical solution for flame speed, conservation equations for 1-D flame are solved with boundary conditions and initial guess.