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Indexed by:期刊论文

Date of Publication:2016-10-01

Journal:FLOW TURBULENCE AND COMBUSTION

Included Journals:SCIE、EI、Scopus

Volume:97

Issue:3

Page Number:729-742

ISSN No.:1386-6184

Key Words:Synthetic jet; D-Shaped cylinder wake; Flow control

Abstract:Effects of synthetic jets on the wake of a D-shaped cylinder is investigated experimentally at a Reynolds number Re-H = 47,000, based on incoming free-stream velocity and the cylinder height (H). The synthetic jets are introduced immediately from the upper and lower trailing edges of the cylinder. The upper and lower synthetic jets are operated in an in-phase or anti-phase mode, and at a momentum ratio C-mu = 1.0% and perturbation frequency St(A) = 0.11-0.37. The cylinder wake with perturbation is examined in detail and compared with that without, based on smoke-wire flow visualization, pressure transducer and hotwire rake measurements, and data analyses of spectra, tempo-spatial cross-correlation and proper orthogonal decomposition (POD). Large-scale vortical structures in the cylinder wake are significantly modified by the synthetic jets perturbations, exhibiting symmetric or asymmetric patterns, depending on the perturbation frequency and phase relationship of the synthetic jets. These observations are internally correlated with the drag force variations.