Turbulence, ubiquitous in daily life, is well known to be one of the major problems in classical physics but still not solved fully. Adding combustion to it increases the complexity by many fold because of the non-linear interaction between two non-linear processes; turbulence and chemical reactions. In this talk we shall highlight these issues by introducing laminar combustion physics first, then remarking on the turbulence-combustion interactions. The salient features which has helped us to build mathematical models for engineering use will be introduced. A specific modelling framework for fuel-lean turbulent combustion of practical interest will then be discussed.
