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Vortex-generator model and its application to flow control
2005 (English)In: Journal of Aircraft, ISSN 0021-8669, Vol. 42, no 6, 1486-1491 p.Article in journal (Refereed) Published
Abstract [en]

A new vortex-generator model is introduced, the jBAY model, which provides an efficient method for computational-fluid-dynamics (CFD) simulation of flow systems with vortex-generator arrays. The jBAY model is based on the lifting force theory of Bender, Anderson, and Yagle (Bender, E. E., Anderson, B. H., and Yagle, P. J., "Vortex Generator Modelling for Navier-Stokes Codes," American Society of Mechanical Engineers, FEDSM 996919, New York, July 1999) but uses a novel technique for defining the model control points. This greatly simplifies usage of the model as well as improving its performance and accuracy. The jBAY model is described in the context of its implementation in the CFD code Edge, an unstructured Reynolds-averaged Navier-Stokes solver. Results are presented for a single vortex generator on a flat plate and two flow control cases: an S-duct air intake and a high-lift wing configuration. The model is shown to give good agreement with both experimental results and with CFD computations where the vortex generator is fully gridded. It is demonstrated that the jBAY model is simple to apply and efficiently captures the effect of vortex generator arrays for both internal and external flows.

Place, publisher, year, edition, pages
2005. Vol. 42, no 6, 1486-1491 p.
Keyword [en]
Flat plates, Generator arrays, Vortex-generator model, Wing configuration
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6290DOI: 10.2514/1.12220ISI: 000233846200013OAI: oai:DiVA.org:kth-6290DiVA: diva2:10966
Note
Uppdaterad från manuskript till artikel: 20100902 QC 20100902Available from: 2006-10-25 Created: 2006-10-25 Last updated: 2010-12-06Bibliographically approved
In thesis
1. Vortex generator modeling and its application to optimal control of airflow in inlet
Open this publication in new window or tab >>Vortex generator modeling and its application to optimal control of airflow in inlet
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This dissertation deals with the development of the vortex generator model and its use for the optimization study of vortex generator flow control in high-offset-ed inlets. In the first part, the overview of use of vortex generators and their mechanism is outlined. Both the application form the existing aircraft as well as laboratory studies are reviewed. The second part contains four papers. The first paper deals with the development, verification and validation of the vortex generator model in Navier-Stokes code. Although primarily meant to be used in inlets, the validation of the model was carried out in case of high-lift system by comparing pressure coefficient to the experimental data. Second paper deals with development of the inflow and outflow mass flow boundary conditions for Navier-Stokes codes. Newly designed mass flow boundary conditions were compared to existing mass flow boundary conditions. Special attention was paid to flows under condition of choking. Third paper deals with the Design of Experiment optimization study of the vortex generator flow control in the RAE M2129 inlet with two sets of five geometrical parameters. The aim is to reduce the inlet flow distortion and increase pressure recovery. The parameters of optimal vortex generator setup were then used to design a vortex generator flow control in more realistic inlet for a UAV. Fourth paper deals with testing of vortex generator flow control in the UAV inlet under different flight conditions. In order to be able to find appropriate parameters of flow in inlet, entire UAV with prescribed value of the mass flow was calculated. It was found that the proposed vortex generator installation malfunctioned when at conditions corresponding to the high altitude flight conditions. A new configuration with double number of vortex generators was then tested and at proven being stable. Triangular vortex generators were tested also.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 68 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2006:66
Keyword
vortex generator, vortex generator model, flow control, design and optimization, DOE, CFD, UAV, inlet, S-duct, pressure distortion, pressure recovery
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4159 (URN)91-7178-456-X (ISBN)
Public defence
2006-11-06, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20100902Available from: 2006-10-25 Created: 2006-10-25 Last updated: 2010-09-02Bibliographically approved

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