Numerical simulation of thermoacoustic response of laboratory scale premixed multi-slit burner flames

Thermoacoustic instabilities are an entirely unwanted, yet nearly inevitable phenomenon occurring in many practical premixed combustors. If not properly accounted and designed for, they can incur significant increases in the development combustion systems. The fact that such unexpected issues are encountered is indicative of a fundamental lack of understanding regarding the mechanisms that drive thermoacoustic phenomena.;Numerical techniques are used to characterize the thermoacoustic response of premixed multi-slit bunsen burner flames. A symmetrical representation of the multi-slit burner is used, and the transfer function is computed at several different frequencies and at three different equivalence ratios. The numerical results are then compared against experimental results in order to determine the suitability of numerical techniques for studying thermoacoustics. A fully compressible Navier-Stokes combustion solver is used in conjunction with adaptive mesh refinement (AMR) for improved resolution at the flame interface.