Adjoint-based reconstruction of an entropy source by discrete temperature measurements. (1st January 2014)

• Record Type: Journal Article
• Authors: Lemke, M.; Schulze, J.; Sesterhenn, J.
• Is Part Of: International journal of computational science and engineering. Volume 9:Number 5/6(2014)
• Page Start: 526
• Page End: 537
• Publication Date: 2014-01-01
• Subjects: inverse problems -- numerical simulation -- non-linear optimisation -- continuous adjoint methods -- data assimilation -- computational science; Computer science -- Mathematics -- Periodicals; Computer simulation -- Mathematical aspects -- Periodicals; Computational intelligence -- Periodicals; 004.015105
• Languages: English
• ISSNs: 1742-7185

Abstract

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.