(b) Laminar flame speed is an intrinsic characteristic of premixed combustible mixtures. It is the speed at which an unstretched laminar flame will propagate through a quiescent mixture of unburned reactants. (i) draw a schematic of the structure of an unstretched one-dimensional laminar flame. (ii) Based on the flame structure, derive the laminar burning flux f and laminar flame speed for a simplest one-reactant, stoichiometric mixture. (15 marks) Hint: The laminar flame consists of a thicker diffusion zone and a thinner reaction zone; the ratio of these two zone thicknesses is the Zeldovich number (Ze>>1). The simplest mass and heat balance relations suffice to derive the laminar burning flux. (b) Laminar flame speed is an intrinsic characteristic of premixed combustible mixtures. It is the speed at which an unstretched laminar flame will propagate through a quiescent mixture of unburned reactants. (i) draw a schematic of the structure of an unstretched one-dimensional laminar flame. (ii) Based on the flame structure, derive the laminar burning flux f and laminar flame speed for a simplest one-reactant, stoichiometric mixture. (15 marks) Hint: The laminar flame consists of a thicker diffusion zone and a thinner reaction zone; the ratio of these two zone thicknesses is the Zeldovich number (Ze>>1). The simplest mass and heat balance relations suffice to derive the laminar burning flux