Control of Submersible Vortex Flows

Control of Submersible Vortex Flows
Title Control of Submersible Vortex Flows PDF eBook
Author D. M. Bushnell
Publisher
Pages 52
Release 1990
Genre Submersibles
ISBN

Download Control of Submersible Vortex Flows Book in PDF, Epub and Kindle

Control of Submersible Vortex Flows

Control of Submersible Vortex Flows
Title Control of Submersible Vortex Flows PDF eBook
Author National Aeronautics and Space Administration (NASA)
Publisher Createspace Independent Publishing Platform
Pages 52
Release 2018-07-08
Genre
ISBN 9781722322939

Download Control of Submersible Vortex Flows Book in PDF, Epub and Kindle

Vortex flows produced by submersibles typically unfavorably influence key figures of merit such as acoustic and nonacoustic stealth, control effectiveness/maneuverability, and propulsor efficiency/body drag. Sources of such organized, primarily longitudinal, vorticity include the basic body (nose and sides) and appendages (both base/intersection and tip regions) such as the fairwater, dive planes, rear control surfaces, and propulsor stators/tips. Two fundamentally different vortex control approaches are available: (1) deintensification of the amplitude and/or organization of the vortex during its initiation process; and (2) downstream vortex disablement. Vortex control techniques applicable to the initiation region (deintensification approach) include transverse pressure gradient minimization via altered body cross section, appendage dillets, fillets, and sweep, and various appendage tip and spanload treatment along with the use of active controls to minimize control surface size and motions. Vortex disablement can be accomplished either via use of control vortices (which can also be used to steer the vortices off-board), direct unwinding, inducement of vortex bursting, or segmentation/tailoring for enhanced dissipation. Submersible-applicable vortex control technology is also included derived from various aeronautical applications such as mitigation of the wing wake vortex hazard and flight aircraft maneuverability at high angle of attack as well as the status of vortex effects upon, and mitigation of, nonlinear control forces on submersibles. Specific suggestions for submersible-applicable vortex control techniques are presented. Bushnell, D. M. and Donaldson, C. D. Langley Research Center...

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Title Scientific and Technical Aerospace Reports PDF eBook
Author
Publisher
Pages 312
Release 1992
Genre Aeronautics
ISBN

Download Scientific and Technical Aerospace Reports Book in PDF, Epub and Kindle

Small Business Innovation Research

Small Business Innovation Research
Title Small Business Innovation Research PDF eBook
Author
Publisher
Pages 168
Release 1991
Genre Small business
ISBN

Download Small Business Innovation Research Book in PDF, Epub and Kindle

Monthly Catalog of United States Government Publications

Monthly Catalog of United States Government Publications
Title Monthly Catalog of United States Government Publications PDF eBook
Author
Publisher
Pages
Release 1992-04
Genre Government publications
ISBN

Download Monthly Catalog of United States Government Publications Book in PDF, Epub and Kindle

Monthly Catalogue, United States Public Documents

Monthly Catalogue, United States Public Documents
Title Monthly Catalogue, United States Public Documents PDF eBook
Author
Publisher
Pages 1622
Release 1992
Genre Government publications
ISBN

Download Monthly Catalogue, United States Public Documents Book in PDF, Epub and Kindle

Aeronautical Engineering

Aeronautical Engineering
Title Aeronautical Engineering PDF eBook
Author
Publisher
Pages 568
Release 1991
Genre Aeronautics
ISBN

Download Aeronautical Engineering Book in PDF, Epub and Kindle

A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).