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Title:Investigating the frequency behavior of fluidic oscillators and their application as active flow control for an SNLF airfoil
Author(s):Colletti, Christopher
Advisor(s):Ansell, Phillip J.
Department / Program:Aerospace Engineering
Discipline:Aerospace Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):Fluidic Oscillator
S414
Active Flow Control
Aerodynamics
Natural Laminar Flow
Multi Element Airfoil
Abstract:This current study was performed to investigate the effect of geometric variation on the frequency behavior of fluidic oscillators. Fluidic oscillators are able to passively generate a self-induced, self-sustained sweeping planar jet that is highly dependent on internal geometries and inlet conditions. Frequency data was collected for 78 parametric variations of fluidic oscillators under different inlet conditions. A multi-variate non-linear regression procedure was used to build a model to predict the frequency behavior of a fluidic oscillator given a set of internal geometries and inlet conditions. The SNLF S414 airfoil is a multi-element airfoil with an open slot to promote a laminar boundary layer across the entire fore element and large portions of the aft element. Active unsteady flow control using embedded fluidic oscillators was identified as a potential source to improve the flow field and maximize the lift of a multi-element system like the SNLF S414. The predictive model was used to design a set of fluidic oscillators to reach desired non-dimensional frequencies and πΆπœ‡ when embedded in the SNLF S414 airfoil. The SNLF S414 airfoil was tested at 𝑅𝑒𝑐 = 1.8π‘₯10^6 in a 3-ft x 4-ft low-speed, low-turbulence wind tunnel with fluidic oscillators embedded in the aft element at x/c = 0.7 and x/c = 0.8 and applied actuation at various πΆπœ‡. Two different configurations of the SNLF S414 airfoil were tested with and without the applied actuation at both locations. This data will be used to inform additional studies investigating multi-element SNLF style airfoils with unsteady active flow control.
Issue Date:2019-04-24
Type:Text
URI:http://hdl.handle.net/2142/104907
Rights Information:Copyright 2019 Christopher Colletti
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05
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