Flame speed in diffusion dominated premixed flames

Development of a premixed flame theory that includes the effects stretch and curvature has been at forefront combustion research. Diffusion dominated flames such as highly curved balls present challenging structure not included in current so far. In flames, relationship between consumption speed negative displacement usually marks boundary what can predict. this work, our objective is to derive general formulation which naturally relationship. We use flamelet equations derived using mass based rate show if diffusion flux unburnt side ignored, normally done theory, describe propagation different types be derived. Based on thin reaction zone assumption, solutions from are verified against numerical results for 1D ideal balls. Further verification multi-dimensional ball-like where both convection regions flames. It shown extended able predict kinematics better way by describing well.