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Book Adaptive wall Wind tunnel Research at NASA Ames Research Center

Download or read book Adaptive wall Wind tunnel Research at NASA Ames Research Center written by and published by . This book was released on 1982 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book 34th Aerospace Sciences Meeting Exhibit

Download or read book 34th Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 1996 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Direct Validation of the Wall Interference Correction System of the Ames 11 Foot Transonic Wind Tunnel

Download or read book Direct Validation of the Wall Interference Correction System of the Ames 11 Foot Transonic Wind Tunnel written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-31 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data from the test of a large semispan model was used to perform a direct validation of a wall interference correction system for a transonic slotted wall wind tunnel. At first, different sets of uncorrected aerodynamic coefficients were generated by physically changing the boundary condition of the test section walls. Then, wall interference corrections were computed and applied to all data points. Finally, an interpolation of the corrected aerodynamic coefficients was performed. This interpolation made sure that the corrected Mach number of a given run would be constant. Overall, the agreement between corresponding interpolated lift, drag, and pitching moment coefficient sets was very good. Buoyancy corrections were also investigated. These studies showed that the accuracy goal of one drag count may only be achieved if reliable estimates of the wall interference induced buoyancy correction are available during a test.Ulbrich, Norbert and Boone, Alan R.Ames Research CenterCORRECTION; TRANSONIC WIND TUNNELS; WALL FLOW; WIND TUNNEL TESTS; AERODYNAMIC INTERFERENCE; SLOTTED WIND TUNNELS; INTERPOLATION; MACH NUMBER; PITCHING MOMENTS; LIFT; BOUNDARY CONDITIONS; ACCURACY; BUOYANCY

Book Scientific and Technical Aerospace Reports

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:

Book Wind Tunnel Wall Correction

Download or read book Wind Tunnel Wall Correction written by B. F. R. Ewald and published by . This book was released on 1998 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report was compiled by an international team of wind tunnel wall correction experts. It presents the present state of the art in wind tunnel wall corrections with a special emphasis given to the description of modern wall correction methods based on Computational Fluid Dynamics. This AGARDograph was planned by the AGARD Fluid Dynamics Panel to be a modern sequel of the successful AGARDograph 109 "Subsonic Wind Tunnel Wall Corrections", which was published in 1966. AGARDogaph 109 is still valid and continues to be used to provide wall corrections in many wind tunnels. Nevertheless, in the thirty two years since the publication of AGARDograph 109, much work has been done on the subject, and the influence of the new tool of numerical fluid dynamics was so strong, that a sequel to AGARDograph 109 was considered to be necessary.

Book NASA Scientific and Technical Publications

Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1993 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Study of the Integration of Wind Tunnel and Computational Methods for Aerodynamic Configurations

Download or read book Study of the Integration of Wind Tunnel and Computational Methods for Aerodynamic Configurations written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-12 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to determine the effectiveness of using a low-order panel code to estimate wind tunnel wall corrections. The corrections were found by two computations. The first computation included the test model and the surrounding wind tunnel walls, while in the second computation the wind tunnel walls were removed. The difference between the force and moment coefficients obtained by comparing these two cases allowed the determination of the wall corrections. The technique was verified by matching the test-section, wall-pressure signature from a wind tunnel test with the signature predicted by the panel code. To prove the viability of the technique, two cases were considered. The first was a two-dimensional high-lift wing with a flap that was tested in the 7- by 10-foot wind tunnel at NASA Ames Research Center. The second was a 1/32-scale model of the F/A-18 aircraft which was tested in the low-speed wind tunnel at San Diego State University. The panel code used was PMARC (Panel Method Ames Research Center). Results of this study indicate that the proposed wind tunnel wall correction method is comparable to other methods and that it also inherently includes the corrections due to model blockage and wing lift. Browne, Lindsey E. and Ashby, Dale L. Ames Research Center...

Book An Experimental Investigation of Boundary Layer and Crossflow Characteristics of the AMes 2 by 2 foot and 11 by 11 foot Transonic Wind tunnel Walls

Download or read book An Experimental Investigation of Boundary Layer and Crossflow Characteristics of the AMes 2 by 2 foot and 11 by 11 foot Transonic Wind tunnel Walls written by Gerald Edwin Matyk and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book NASA Scientific and Technical Publications A Catalog of Special Publications Reference Publications Conference Publications and Technical Papers 1991 1992

Download or read book NASA Scientific and Technical Publications A Catalog of Special Publications Reference Publications Conference Publications and Technical Papers 1991 1992 written by and published by . This book was released on 1993 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Two Dimensional Adaptive Wall Test Section with Ventilated Walls in the Ames 2 By 2 Foot Transonic Wind Tunnel

Download or read book A Two Dimensional Adaptive Wall Test Section with Ventilated Walls in the Ames 2 By 2 Foot Transonic Wind Tunnel written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first tests conducted in the adaptive-wall test section of the Ames Research Center's 2- by 2-Foot Transonic Wind Tunnel are described. A procedure was demonstrated for reducing wall interference in transonic flow past a two-dimensional airfoil by actively controlling flow through the slotted walls of the test section. Flow through the walls was controlled by adjusting pressures in compartments of plenums above and below the test section. Wall interference was assessed by measuring (with a laser velocimeter) velocity distributions along a contour surrounding the model, and then checking those measurements for their compatibility with free-air far-field boundary conditions. Plenum pressures for minimum wall interference were determined from empirical influence coefficients. An NACA 0012 airfoil was tested at angles of attach of 0 and 2, and at Mach numbers between 0.70 and 0.85. In all cases the wall-setting procedure greatly reduced wall interference. Wall interference, however, was never completely eliminated, primarily because the effect of plenum pressure changes on the velocities along the contour could not be accurately predicted. Schairer, Edward T. and Lee, George and Mcdevitt, T. Kevin Ames Research Center...

Book Apollo Wind Tunnel Testing Program

Download or read book Apollo Wind Tunnel Testing Program written by William C. Moseley (Jr.) and published by . This book was released on 1966 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: