Response of flames with different degrees of premixedness to acoustic oscillations

05 Jun 2018

The response of three flames with different degrees of premixedness (fully premixed, non-premixed with radial, and non-premixed with axial fuel injection) to acoustic oscillations is studied experimentally. The flames were imaged using OH* chemiluminescence and OH Planar Laser Induced Fluorescence (OH PLIF) at 5 kHz. In addition to a flame kinematics analysis, the amplitude dependence of the transfer function was calculated. The dominant spatial structures of the heat release and their periodicity were examined using the Proper Orthogonal Decomposition (POD) method. The non-premixed system with radial fuel injection showed the highest response to acoustic forcing, followed by the fully premixed and the non-premixed system with axial fuel injection. In addition, the response of the non-premixed system with radial fuel injection was greater than that of the fully premixed system for various bulk velocities U, global φ, forcing amplitudes, A and forcing frequencies, f. About 70% of the energy of the total fluctuations in the NPR case is contained in the first four POD modes, a percentage that decreases with overall equivalence ratio, but only this drops to about 40% for the NPA flame. The frequency spectra of the coefficients of the POD modes have peaks at the forcing frequency, with increasing broadband contributions in higher modes and for the NPA flame.