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On the Properties and Mechanisms of Microjet Arrays in Crossflow for the Control of Flow Separation

Title: On the Properties and Mechanisms of Microjet Arrays in Crossflow for the Control of Flow Separation.
Name(s): Fernandez, Erik J., 1983-, author
Alvi, Farrukh S., professor directing dissertation
Zheng, Jianping P., university representative
Taira, Kunihiko, committee member
Kumar, Rajan, committee member
Collins, E. (Emmanuel), committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Mechanical Engineering, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2014
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (222 pages)
Language(s): English
Abstract/Description: By utilizing passive and active methods of flow control, the aerodynamic performance of external and internal components can be greatly improved. Recently however, the benefits of applying active flow control methods to turbomachinery components for improved fuel efficiency, reduced engine size, and greater operational envelope has sparked a renewed interest in some of these flow control techniques. The more attractive of these, is active control in the form of jets in cross flow. With their ability to be turned on and off, as well as their negligible effect on drag when not being actuated, they are well suited for applications such as compressor and turbine blades, engine inlet diffusers, internal engine passages, and general external aerodynamics. This study consists of two parts. The first is the application of active control on a low-pressure turbine (LPT) cascade to determine the effectiveness of microjet actuators on flow separation at relatively low speeds. The second study, motivated by the first, involves a parametric study on a more canonical model to examine the effects of various microjet parameters on the efficacy of separation control and to provide a better understanding of the relevant flow physics governing this control approach. With data obtained from velocity measurements across the wide parametric range, correlations for the growth of the counter-rotating vortex pairs generated by these actuators are deduced. From the information and models obtained throughout the study, basic suggestions for microjet actuator design are presented.
Identifier: FSU_migr_etd-9174 (IID)
Submitted Note: A Dissertation submitted to the Department Mechanical Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Fall Semester, 2014.
Date of Defense: July 24, 2014.
Keywords: Flow Control, Jets in Crossflow, Microjets, Separation Control, Turbomachinery, Vortex Generator Jets
Bibliography Note: Includes bibliographical references.
Advisory Committee: Farrukh S. Alvi, Professor Directing Dissertation; Jianping Zheng, University Representative; Kunihiko Taira, Committee Member; Rajan Kumar, Committee Member; Emmanuel Collins, Committee Member.
Subject(s): Aerospace engineering
Mechanical engineering
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Owner Institution: FSU

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Fernandez, E. J. (2014). On the Properties and Mechanisms of Microjet Arrays in Crossflow for the Control of Flow Separation. Retrieved from