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Control of Separated Flow Using a Di...

Hasan, Mahdi .

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Control of Separated Flow Using a Dielectric Barrier Discharge Plasma Actuator.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Control of Separated Flow Using a Dielectric Barrier Discharge Plasma Actuator./
作者:	Hasan, Mahdi .
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	95 p.
附註:	Source: Masters Abstracts International, Volume: 81-09.
Contained By:	Masters Abstracts International81-09.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27546142
ISBN:	9781392441534

Control of Separated Flow Using a Dielectric Barrier Discharge Plasma Actuator.
Hasan, Mahdi .

Control of Separated Flow Using a Dielectric Barrier Discharge Plasma Actuator. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 95 p.

Source: Masters Abstracts International, Volume: 81-09.

Thesis (M.S.)--North Carolina Agricultural and Technical State University, 2019.

This item must not be sold to any third party vendors.

Historically, Dielectric Barrier Discharge (DBD) plasma actuators have shown to be an effective method to control adverse pressure gradient induced boundary layer separation. In this study, a numerical investigation was carried out to explore the effects of a DBD plasma actuator on a three-dimensional incompressible, separated flow. The well-validated National Aeronautics and Space Administration (NASA) wall-mounted hump configuration studied in the simulations, were run at a Reynolds Number of 936,000, based on chord length, and a freestream Mach number of 0.1. The baseline code, CALC-LES, developed by the Chalmers University of Technology was modified to include the effects of the plasma actuator [1], which were modeled as source terms in the momentum equations and were assumed to be steady and constant along the spanwise direction. A hybrid RANS-LES based Partially Averaged Navier-Stokes (PANS) model was used to compute the effects of fine-scale turbulence. The simulations were carried out for both a baseline (no control) and a plasma control case. Comparisons of time-averaged skin friction, coefficient of pressure, and velocity profiles showed good agreement with the experiment for the baseline case. The results with the plasma actuator turned on showed improved flow characteristics compared to the previous investigations by reducing the overall flow separation. A slight delay in the onset of flow separation and rapid flow reattachment was also observed. Several test cases with varied plasma actuator locations and applied voltage frequency were run to analyze and optimize the control performance of the plasma actuator. It was found that the plasma actuator placed at the location just downstream of the separation point showed improved results. In addition, the plasma actuator operated at a high frequency, i.e., 5KHz induces maximum plasma body force and hence completely removes the separated flow.

ISBN: 9781392441534Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

CALC-LES

Control of Separated Flow Using a Dielectric Barrier Discharge Plasma Actuator.
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506 $a This item must not be sold to any third party vendors.
520 $a Historically, Dielectric Barrier Discharge (DBD) plasma actuators have shown to be an effective method to control adverse pressure gradient induced boundary layer separation. In this study, a numerical investigation was carried out to explore the effects of a DBD plasma actuator on a three-dimensional incompressible, separated flow. The well-validated National Aeronautics and Space Administration (NASA) wall-mounted hump configuration studied in the simulations, were run at a Reynolds Number of 936,000, based on chord length, and a freestream Mach number of 0.1. The baseline code, CALC-LES, developed by the Chalmers University of Technology was modified to include the effects of the plasma actuator [1], which were modeled as source terms in the momentum equations and were assumed to be steady and constant along the spanwise direction. A hybrid RANS-LES based Partially Averaged Navier-Stokes (PANS) model was used to compute the effects of fine-scale turbulence. The simulations were carried out for both a baseline (no control) and a plasma control case. Comparisons of time-averaged skin friction, coefficient of pressure, and velocity profiles showed good agreement with the experiment for the baseline case. The results with the plasma actuator turned on showed improved flow characteristics compared to the previous investigations by reducing the overall flow separation. A slight delay in the onset of flow separation and rapid flow reattachment was also observed. Several test cases with varied plasma actuator locations and applied voltage frequency were run to analyze and optimize the control performance of the plasma actuator. It was found that the plasma actuator placed at the location just downstream of the separation point showed improved results. In addition, the plasma actuator operated at a high frequency, i.e., 5KHz induces maximum plasma body force and hence completely removes the separated flow.
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