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Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

EXPERIMENTAL AND NUMERICAL INVESTIGATION OF NOISE GENERATION BY TURBULENT COMBUSTION IN A COMBUSTOR

pages 995-1000
DOI: 10.1615/TSFP3.1660
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摘要

This paper is twofold. The first objective is to experimentally investigate the noise generated by combustion. For this purpose a turbulent air flow behind a rectangular half-dump combustor geometry is considered, with fuel injection just upstream of the dump plane. The fuel and air mix in the recirculation zone downstream of the dump plane, and the noise generated by the combustion is measured. The inlet flow Reynolds number is varied in the range of 15000-30000, and the overall fuel/air equivalence ratio is varied in the range 0.3-0.9. The observed total chemiluminescence intensity fluctuations are correlated with the noise spectra. The combustion noise exhibits a low frequency peak that is dominant when compared to the broadband diminished peak at the natural acoustic mode of the combustor. Secondly, LES calculations are presented for a rather simple configuration. To mimic some periodic phenomena in this configuration, LES computations are first performed using oscillating inflow conditions for predicting turbulent swirling methane-air diffusion flames. The influences of the inflow parameters on the scalar and velocity fields are presented and discussed.

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