Modal Decomposition Study of the Non-Reactive Flow Field in a Dual-Swirl Combustor

Xiangzhou Feng, Jianqin Suo (), Qiandong Li and Longxi Zheng
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Xiangzhou Feng: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710169, China
Jianqin Suo: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710169, China
Qiandong Li: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710169, China
Longxi Zheng: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710169, China

Energies, 2023, vol. 16, issue 17, 1-18

Abstract: The modal decomposition study of the non-reactive flow field in a dual-swirl combustor is investigated through the large eddy simulation. The formation mechanism and function of various recirculation zones are elaborated by analyzing the time-averaged and instantaneous velocity contours of the center section. The precessing vortex core (PVC) is first visualized by the pressure iso-surface, and the evolution process is presented. Different dimensionality reduction methods are adopted to identify the coherent structures from the flow field. The most energetic spatial structure corresponding to the PVC and its second-order harmonic structure is extracted by the classical proper orthogonal decomposition (POD). The coherent structures with high frequency have relatively low energy content. In addition, a spectral proper orthogonal decomposition (SPOD) method, which can implement spatial-temporal decomposition simultaneously, is introduced to obtain the energy-based spatial structures at all characteristic frequencies. A triple-helix with azimuth wave number m = 3 and a quadruple-helix with azimuth wave number m = 4 are discovered as the third-order and the fourth-order harmonics of single-helix, respectively.

Keywords: LES; PVC; POD; SPOD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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