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An Analytical And Experimental Study Of Farfield Rotor Wake Geometry And Velocity
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Book Synopsis An Analytical and Experimental Study of Farfield Rotor Wake Geometry and Velocity by : Thomas Alan Egolf
Download or read book An Analytical and Experimental Study of Farfield Rotor Wake Geometry and Velocity written by Thomas Alan Egolf and published by . This book was released on 1973 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: All fixed wing aircraft generate trailing vortex wakes whose circulatory strength is dependent on flight conditions and aircraft geometry. A rotor also generates a vortex wake. A vortex sheet is shed from each blade. Each sheet rolls up rapidly outboard to form a tip vortex. The purpose of the study reported here is to estimate the rotor wake geometry and velocity field downstream of the rotor for the particular case where the rotor wake exhibits strong similarities to the fixed wing wake. A method is developed by which the helicopter far field wake can be readily compared to the far field wake generated by an equivalent wing. (Author).
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.
Download or read book Research in Progress written by and published by . This book was released on 1973 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Information Indexes by : United States. Naval Air Systems Command
Download or read book Technical Information Indexes written by United States. Naval Air Systems Command and published by . This book was released on 1974 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781730900822 Total Pages :70 pages Book Rating :4.9/5 (8 download)
Book Synopsis Wake Geometry Measurements and Analytical Calculations on a Small-Scale Rotor Model by : National Aeronautics and Space Adm Nasa
Download or read book Wake Geometry Measurements and Analytical Calculations on a Small-Scale Rotor Model written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-05 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to quantify the rotor wake behind a scale model helicopter rotor in forward level flight at one thrust level. The rotor system in this test consisted of a four-bladed fully articulated hub with blades of rectangular planform and an NACA 0012 airfoil section. A laser light sheet, seeded with propylene glycol smoke, was used to visualize the vortex geometry in the flow in planes parallel and perpendicular to the free-stream flow. Quantitative measurements of wake geometric proper- ties, such as vortex location, vertical skew angle, and vortex particle void radius, were obtained as well as convective velocities for blade tip vortices. Comparisons were made between experimental data and four computational method predictions of experimental tip vortex locations, vortex vertical skew angles, and wake geometries. The results of these comparisons highlight difficulties of accurate wake geometry predictions. Ghee, Terence A. and Berry, John D. and Zori, Laith A. J. and Elliott, Joe W. Unspecified Center...
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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. This book was released on 1976-02-01 with total page 312 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.
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.
Book Synopsis An Analytical and Experimental Study of the Effect of Periodic Blade Twist on the Thrust, Torque, and Flapping Motion of an Autogiro Rotor by : Charles Horton Zimmerman
Download or read book An Analytical and Experimental Study of the Effect of Periodic Blade Twist on the Thrust, Torque, and Flapping Motion of an Autogiro Rotor written by Charles Horton Zimmerman and published by . This book was released on 1937 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1973 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Evaluation of a Flat Wake Theory for Predicting Rotor Inflow-wake Velocities by : John C. Wilson
Download or read book Experimental Evaluation of a Flat Wake Theory for Predicting Rotor Inflow-wake Velocities written by John C. Wilson and published by . This book was released on 1992 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1981-07 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Analysis of the Impact of a Compressed Air Wind Tunnel Facility on a Rotorcraft Wake by : Jayden Slotnick
Download or read book Experimental Analysis of the Impact of a Compressed Air Wind Tunnel Facility on a Rotorcraft Wake written by Jayden Slotnick and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the area of rotorcraft design and development, successful scale model testing is critical to perfecting a design. In many areas of aerospace engineering, full scale vehicles are scaled down to model size to test the effectiveness of a design. The benefits of scale model testing are extensive as it significantly reduces the cost to be able to test at model size as opposed to full size. At Pennsylvania State University, there is a newly constructed Compressed Air Wind Tunnel (CAWT) that will be extensively used for rotorcraft testing. This facility is a closed loop wind tunnel that is bound by an inner test section diameter of 41 inches. There are unanswered questions of whether the facility or measurement methods can impact the wake of a scale model rotorcraft. The effects of testing inside the CAWT may include blockage, wake constriction, and recirculation. To examine these effects, a basic 3 bladed rotorcraft geometry was supplied to Pennsylvania State University by Joby Aviation. The model was 3D printed and tested outside the CAWT in a free air environment in hover conditions at an airport hangar with the overall dimensions of 70'x63'x25'. The model was also tested inside the wind tunnel under similar conditions. Both the measurements in the free air environment and inside the CAWT showed expected signs of wake spreading and a decrease in maximum velocity as wake measurements were taken further downstream of the rotor. The results also showed self-similarity after scaling the velocity profile by the maximum velocity and the wake width in the intermediate to far wake regions which occurred as measurements were made between 2 and 3 diameters downstream. One key difference that was found in the data sets taken outside and inside the CAWT was that there was evidence of recirculation in the measurements taken inside the wind tunnel. However, due to testing equipment limitations, the small velocities had a relatively large uncertainty. In future experiments such as thrust or wake measurements for a rotor in hover, careful consideration must be made to account for potential recirculation and possible mitigation techniques may be needed. In summary, the CAWT at Pennsylvania State University will be instrumental for scale model testing and this thesis will provide a detailed analysis of testing effects due to the CAWT with supporting evidence from the experiments that have been conducted.
Book Synopsis An Experimental Investigation of the Vortex Wakes of Hovering and Descending Rotors by : James Anthony Stack
Download or read book An Experimental Investigation of the Vortex Wakes of Hovering and Descending Rotors written by James Anthony Stack and published by . This book was released on 2006 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications and Research and Other Contributions by : Pennsylvania State University
Download or read book Publications and Research and Other Contributions written by Pennsylvania State University and published by . This book was released on 1970 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of the Interaction Between a Rotor Wake and an Airframe with and Without Flow Separation by : Jaimoo Kim
Download or read book An Experimental Study of the Interaction Between a Rotor Wake and an Airframe with and Without Flow Separation written by Jaimoo Kim and published by . This book was released on 1993 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1973 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
