Effect of geometric parameters and flow conditions on the frequency of fluidic oscillators for active flow control

Christopher R. Colletti, Vanessa G. Awate, Phillip J. Ansell

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


A parametric study was performed to understand the frequency scaling produced by fluidic oscillators across a variety of geometric parameters and flow conditions. These oscillators are of interest for active flow control applications, where they can be used to re-energize the boundary layer to prevent trailing edge separation and promote more efficient pressure recovery. Matching the oscillator frequency to the natural instabilities in the flow can create a more efficient and effective approach to performing this unsteady actuation. Thirty-nine slightly different fluidic oscillators were designed for each of two common geometries to study the sensitivity of the oscillator frequency to slight variations in key geometric parameters. Testing was carried out on an isolated oscillator across a range of supply conditions from 6.9kPa to 33 kPa (~150 SLPM to ~400 SLPM) in increments of 172 kPa (~13 SLPM). A model was developed that allows for the prediction of oscillation frequency based on variations in these key geometric parameters and mass flow, which was demonstrated on an example application for sizing the oscillators within an airfoil to target specific F+ and Cμ requirements.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
StatePublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego

ASJC Scopus subject areas

  • Aerospace Engineering


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