Aerodynamic Flow Control on Axisymmetric Cylindrical Model at High Incidence
Author(s)
Lee, Edward
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Abstract
This research focuses on the evolution and instabilities of forebody vortices over slender
axisymmetric cylinders at high angles of incidence, with an emphasis on the control and
manipulation of the resulting aerodynamic loads. The investigations build on prior studies of
vortex asymmetry and stability, hypothesizing that fluidic actuation can alter vortex dynamics and
aerodynamic forces to achieve controlled flow symmetry and stability under varying conditions.
The experiments were conducted on cylindrical models integrated with synthetic jet actuators
and a forebody sectional bleed mechanism, allowing for systematic control of azimuthal actuation.
The flow evolution and aerodynamic loads were measured using wind tunnel testing,
complemented by planar particle image velocimetry and load cell measurements.
The investigations explored the receptivity of the forebody vortices to synthetic jet actuation,
demonstrating that azimuthally varying actuation could control asymmetries and stabilize the
aerodynamic loads at low and high incidence. Another approach employing forebody sectional
bleed was developed to investigate the potential for manipulating vortex asymmetry by leveraging
azimuthally distributed bleed driven by local pressure variations, with the aim of achieving
deliberate control over vortex configurations and associated side loads. An internally rotating
bleed mechanism was integrated into the forebody, enabling bi-directional control of aerodynamic
forces and vortex dynamics. These findings reveal the efficacy of both synthetic jet actuation and
aerodynamic bleed in manipulating forebody vortices and regulating associated loads under varied
flow condition
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Date
2024-12-10
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Text
Resource Subtype
Dissertation (PhD)