Suppression of cavity oscillations via three-dimensional steady blowing

Yang Zhang, Yiyang Sun, Nishul Arora, Louis Cattafesta, Kunihiko Taira, Lawrence Ukeiley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

This paper presents an investigation of open-loop control of cavity flow oscillations using a three-dimensional (3-D) array of steady jets located at the leading edge of the cavity. The actuation is introduced to suppress flow oscillations in a rectangular cavity with a length-to-depth ratio (L/D) of 6 at Mach numbers from 0.3 to 0.7. Several different slot-jet configurations are assessed for their control performance considering the jet output momentum and interactions with the boundary layer at the leading edge. Significant tonal and broadband reduction of cavity oscillations are observed using 3-D actuation with wavelengths (λ/D) from 0.5 to 1 and with 25-50% spatial duty cycle. High speed (12 kHz) schlieren imaging and 2-D and Stereo Particle Image Velocimetry (SPIV) are performed to investigate the baseline and controlled flow fields. Companion 3-D large eddy simulations (LES) are performed and exhibit good agreement with the experiments. The experiments and complementary LES reveal detailed flow physics. The 3-D actuation introduces strong spanwise wave-like structures which disrupt the growth of the shear layer and reduce the strength of the impingement region. The experimental and numerical analysis aid in the development of optimal control methodologies.

Original languageEnglish (US)
Title of host publication45th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103629
StatePublished - Jan 1 2015
Event45th AIAA Fluid Dynamics Conference, 2015 - Dallas, United States
Duration: Jun 22 2015Jun 26 2015

Publication series

Name45th AIAA Fluid Dynamics Conference

Other

Other45th AIAA Fluid Dynamics Conference, 2015
CountryUnited States
CityDallas
Period6/22/156/26/15

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