Analysis of direct and indirect noise in a next-generation aviation gas turbine combustor

Brouzet, Davy; Krisna, Benyamin; McCormick, Duane; Reimann, C. Aaron; Mendoza, Jeff; Ihme, Matthias

doi:10.1016/j.combustflame.2023.113249

Title: Analysis of direct and indirect noise in a next-generation aviation gas turbine combustor

Journal Article · 13 December 2023 · Combustion and Flame

DOI: https://doi.org/10.1016/j.combustflame.2023.113249 · OSTI ID:2405181

^[1];

^[2]; McCormick, Duane ^[3]; Reimann, C. Aaron ^[3]; Mendoza, Jeff ^[3];

^[4]

Stanford Univ., CA (United States); SLAC
Stanford Univ., CA (United States)
Raytheon Technologies Research Center, East Hartford, CT (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

A large-eddy simulation (LES) of a next-generation combustor is performed to examine effects of this combustor concepts on direct and indirect combustion noise characteristics. Direct noise is computed considering the unsteady heat release predictions while entropy fluctuations in the downstream part of the combustor are used to estimate indirect noise through the transfer function of the outlet nozzle. A low-order acoustic reconstruction technique, which utilizes the Green’s function of the configuration, is developed to compute the acoustics inside the combustor. Comparisons to experimental results are reported, showing the reasonable accuracy of the LES and combustion noise computations. The direct noise spectrum peaks at frequencies around 3 kHz because of the fast timescales associated with the chemical reactions inside the combustor. In addition, the indirect noise is dominant at low frequencies, i.e., less than 400 Hz, because of the characteristics of the entropy spectrum at the outlet nozzle. Further, compared to a conventional rich-quench-lean (RQL) combustor configuration, significant differences in the acoustics are observed, and are explained by two specific technological novelties. Firstly, the direct noise spectrum peaks at significantly higher frequencies due to the combustor’s compactness. Secondly, the entropy inhomogeneties downstream of the combustion region are an order of magnitude smaller in amplitude due to the lack of dilution with cold air. This leads to a significant reduction in the indirect noise amplitude at low frequencies, where it is the dominant source of noise. These results suggest opportunities for advanced combustion technologies to achieve substantial reductions in combustion-related noise.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2405181

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 260; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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