Experimental Investigation Of The Far Field Rotorcraft Wake Structure

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Experimental Investigation of the Far-field Rotorcraft Wake Structure

Author : James Harold Stephenson
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (794 download)

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Book Synopsis Experimental Investigation of the Far-field Rotorcraft Wake Structure by : James Harold Stephenson

Download or read book Experimental Investigation of the Far-field Rotorcraft Wake Structure written by James Harold Stephenson and published by . This book was released on 2012 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tumbling tip vortex effect of a reduced-scale, 1 m diameter, four-bladed rotor during hover is studied using vortex methods, combined with a center of mass analysis approach. Measurements of all three components of the velocity field are acquired using a stereo PIV system synchronized to capture up to 500 degrees of vortex age, with 10 degree wake age offsets, during hover conditions. The nominal operating condition of the rotor is at a rotational rate of 1520RPM, corresponding to ReC = 248,000 with a chord length of 58.5mm. The rotor is operated with a pitch of 7.2± 0.5 degrees and a CT/sigma of 0.045. The far wake vortex tumbling phenomenon is captured and described. It is shown that tip vortices from two blades tumble through approximately 90 degrees of rotation before they coalesce. It is also seen that the constituent parent vortices do not combine to create a stronger daughter vortex as was previously thought to happen. Instead, the merged vortex has a lower large-radius circulation than either of its parent vortices. An accurate characterization and prediction of the trajectory of the far wake vortex tumbling can enhance the ability to predict and alleviate the resuspension of particles during brownout as well as provide a database for far wake validation of CFD codes.

Flow Modulation and Fluid—Structure Interaction at Airplane Wings

Author : Josef Ballmann
Publisher : Springer Science & Business Media
ISBN 13 : 3540448667
Total Pages : 396 pages
Book Rating : 4.5/5 (44 download)

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Book Synopsis Flow Modulation and Fluid—Structure Interaction at Airplane Wings by : Josef Ballmann

Download or read book Flow Modulation and Fluid—Structure Interaction at Airplane Wings written by Josef Ballmann and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research work of the collaborative research center SFB401 Flow Modulation and Fluid-Structure Interaction at Airplane Wings at the Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen, which is reported in this book, was pos sible due to the financial support of the Deutsche Forschungsgemeinschaft (DFG). The proposal has been approved after evaluation by the referees of DFG selected from other universities and industry, which is gratefully acknowledged. The work is still in progress and now approved to continue until the end of year 2005. More than 50 scientists from universities of the United States, Russia, France, Italy, Japan, Great Britain, Sweden, Netherlands, Switzerland, Austria and research orga nizations NASA, ONERA, NLR, DLR could be invited and have visited the research center, gave seminars on their research on related topics and some of them stayed longer for joined work. Besides its scientific value, also the importance of the pro gram for scientific educa tion becomes evident by looking at the numbers of completed theses, which are up to now about 15 doctoral theses, 40 diploma theses and 70 study theses. The authors of this book acknowledge the valuable support coming from all these persons and institutions. They are especially grateful to the referees having reviewed this work, A. Cohen (Universite Pierre et Marie Curie), J. Cooper (Manchester School of Engineering), W. Devenport (Virginia Tech.), M. Drela (MIT), F. Gern (Avionics Specialties Inc.), A. Griewank (TU Dresden), H. Hönlinger (DLR), P.

Masters Theses in the Pure and Applied Sciences

Author : Wade H. Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 147575776X
Total Pages : 299 pages
Book Rating : 4.4/5 (757 download)

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Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis, (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 19 (thesis year 1974) a total of 10,045 theses titles from 20 Canadian and 209 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 19 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeronautical Engineering

Author :
Publisher :
ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.F/5 ( download)

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Download or read book Aeronautical Engineering written by and published by . This book was released on 1971 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)

Government Reports Announcements

Author :
Publisher :
ISBN 13 :
Total Pages : 1726 pages
Book Rating : 4.3/5 (129 download)

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Download or read book Government Reports Announcements written by and published by . This book was released on 1973 with total page 1726 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Government Reports Announcements & Index

Author :
Publisher :
ISBN 13 :
Total Pages : 840 pages
Book Rating : 4.:/5 (3 download)

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Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993-07 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

U.S. Government Research & Development Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (31 download)

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Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1970 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Applied mechanics reviews

Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)

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Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

NASA SP.

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Publisher :
ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis NASA SP. by :

Download or read book NASA SP. written by and published by . This book was released on 1992 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effects of Streamline Curvature on Turbulent Flow

Author : Peter Bradshaw
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Effects of Streamline Curvature on Turbulent Flow by : Peter Bradshaw

Download or read book Effects of Streamline Curvature on Turbulent Flow written by Peter Bradshaw and published by . This book was released on 1973 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Streamline curvature in the plane of the mean shear produces large changes in the turbulence structure of shear layers, usually an order of magnitude more important than normal pressure gradients and other terms in the mean-motion equations for curved flows. The effects on momentum and heat transfer in boundary layers are noticeable on typical wing sections and are very important on highly-cambered turbomachine blades: turbulence may be nearly eliminated on highly-convex surfaces, while on highly-concave surfaces momentum transfer by quasi-steady longitudinal vortices dominates the ordinary turbulence processes. The greatly enhanced mixing rates of swirling jets and the characteristic non-turbulent cores of trailing vortices are also consequences of the effects of streamline curvature on the turbulence structure. A progress report, comprises a review of current knowledge, a discussion of methods of predicting curvature effects, and a presentation of principles for the guidance of future workers.

The Aeronautical Journal

Author :
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ISBN 13 :
Total Pages : pages
Book Rating : 4.3/5 (91 download)

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Download or read book The Aeronautical Journal written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

New Results in Numerical and Experimental Fluid Mechanics III

Author : Siegfried Wagner
Publisher : Springer Science & Business Media
ISBN 13 : 9783540426967
Total Pages : 458 pages
Book Rating : 4.4/5 (269 download)

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Book Synopsis New Results in Numerical and Experimental Fluid Mechanics III by : Siegfried Wagner

Download or read book New Results in Numerical and Experimental Fluid Mechanics III written by Siegfried Wagner and published by Springer Science & Business Media. This book was released on 2002-02-26 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the papers of a German symposium dealing with research and project work in numerical and experimental aerodynamics and fluidmechanics for aerospace and other applications. It gives a broad overview over the ongoing work in this field in Germany.

AIAA 73-659 - AIAA 73-705 (With omissions in numbering)

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Publisher :
ISBN 13 :
Total Pages : 628 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis AIAA 73-659 - AIAA 73-705 (With omissions in numbering) by :

Download or read book AIAA 73-659 - AIAA 73-705 (With omissions in numbering) written by and published by . This book was released on 1973 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Monthly Catalog of United States Government Publications

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Publisher :
ISBN 13 :
Total Pages : 1570 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Monthly Catalog of United States Government Publications by :

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1974 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Collection of Technical Papers: AIAA 85-1550 - AIAA 85-1600

Author :
Publisher :
ISBN 13 :
Total Pages : 614 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis A Collection of Technical Papers: AIAA 85-1550 - AIAA 85-1600 by :

Download or read book A Collection of Technical Papers: AIAA 85-1550 - AIAA 85-1600 written by and published by . This book was released on 1985 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Vortex Wakes of Conventional Aircraft

Author : Coleman duPont Donaldson
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Vortex Wakes of Conventional Aircraft by : Coleman duPont Donaldson

Download or read book Vortex Wakes of Conventional Aircraft written by Coleman duPont Donaldson and published by . This book was released on 1975 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is made of the present state of our knowledge of the vortex wakes of conventional aircraft. Included are discussions of wake rollup, geometry, instability, and turbulent aging. In the light of these discussions, a brief review is made of the persistence of vortices in the atmosphere, and design techniques which might be used to minimize wake hazard are considered.