Adjoint-based reconstruction of an entropy source by discrete temperature measurements. (1st January 2014) - Lemke, M.
The heat release rate is a significant quantity of lean premixed flames in technical flows. The heat release is commonly determined by OH* chemiluminescence measurements which are not fully reliable for turbulent flames owing to a superposition of desired emissions and broadband noise. The present study applies an adjoint-based data assimilation technique in order to reconstruct the heat release rate of a flame from pointwise temperature measurements. As a simplified test case, the method is applied to a two-dimensional channel flow and the combustion process is modelled by an artificial entropy source distributed in space and time.