Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control

Bibliographic Details
Main Author:	Marks, Christopher R.
Language:	English
Published:	Wright State University / OhioLINK 2011
Subjects:	Aerospace Engineering Engineering Fluid Dynamics Mechanical Engineering low Reynolds number fluid dynamics surface stress sensitive film flow control separation control S3F plasma actuator dielectric barrier discharge
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=wright1309998636

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-wright13099986362021-08-03T06:17:26Z Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control Marks, Christopher R. Aerospace Engineering Engineering Fluid Dynamics Mechanical Engineering low Reynolds number fluid dynamics surface stress sensitive film flow control separation control S3F plasma actuator dielectric barrier discharge Low Reynolds number boundary layer separation causes reduced aerodynamic performance in a variety of applications such as MAVs, UAVs, and turbomachinery. The inclusion of a boundary layer separation control system offers a way to improve efficiency in conditions that would otherwise result in poor performance. Many effective passive and active boundary layer control methods exist. Active methods offer the ability to turn on, off, or adjust parameters of the flow control system with either an open loop or closed loop control strategy using sensors. This research investigates the use of a unique sensor called Surface Stress Sensitive Film (S3F) in a closed loop, low Reynolds number separation control system. S3F is an elastic film that responds to flow pressure gradients and shear stress along its wetted surface, allowing optical measurement of wall pressure and skin friction. A new method for installing the S3F sensor to assure a smooth interface between the wall and wetted S3F surface was investigated using Particle Image Velocimetry techniques (PIV). A Dielectric Barrier Discharge (DBD) plasma actuator is used to control laminar boundary layer separation on an Eppler 387 airfoil over a range of low Reynolds numbers. Several different DBD plasma actuator electrode configurations were fabricated and characterized in an open loop configuration to verify separation control of the Eppler 387 boundary layer. The open loop study led to the choice of a spanwise array of steady linear vertical jets generated by DBD plasma as the control system flow effecter. Operation of the plasma actuator resulted in a 33% reduction in section drag coefficient and reattachment of an otherwise separated boundary layer. The dissertation culminates with an experimental demonstration of S3F technology integrated with a control system and flow effecter for closed loop, low Reynolds number separation control. A simple On/Off controller and Proportional Integral (PI) controller were used to close the control loop. 2011-07-18 English text Wright State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=wright1309998636 http://rave.ohiolink.edu/etdc/view?acc_num=wright1309998636 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Aerospace Engineering Engineering Fluid Dynamics Mechanical Engineering low Reynolds number fluid dynamics surface stress sensitive film flow control separation control S3F plasma actuator dielectric barrier discharge
spellingShingle	Aerospace Engineering Engineering Fluid Dynamics Mechanical Engineering low Reynolds number fluid dynamics surface stress sensitive film flow control separation control S3F plasma actuator dielectric barrier discharge Marks, Christopher R. Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
author	Marks, Christopher R.
author_facet	Marks, Christopher R.
author_sort	Marks, Christopher R.
title	Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
title_short	Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
title_full	Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
title_fullStr	Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
title_full_unstemmed	Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control
title_sort	surface stress sensors for closed loop low reynolds number separation control
publisher	Wright State University / OhioLINK
publishDate	2011
url	http://rave.ohiolink.edu/etdc/view?acc_num=wright1309998636
work_keys_str_mv	AT markschristopherr surfacestresssensorsforclosedlooplowreynoldsnumberseparationcontrol
_version_	1719434121977004032

Surface Stress Sensors for Closed Loop Low Reynolds Number Separation Control

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