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The Real-Time Wall Interference Correction System of the NASA Ames 12-Foot Pressure Wind Tunnel

The Real-Time Wall Interference Correction System of the NASA Ames 12-Foot Pressure Wind Tunnel


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About the Book

An improved version of the Wall Signature Method was developed to compute wall interference effects in three-dimensional subsonic wind tunnel testing of aircraft models in real-time. The method may be applied to a full-span or a semispan model. A simplified singularity representation of the aircraft model is used. Fuselage, support system, propulsion simulator, and separation wake volume blockage effects are represented by point sources and sinks. Lifting effects are represented by semi-infinite line doublets. The singularity representation of the test article is combined with the measurement of wind tunnel test reference conditions, wall pressure, lift force, thrust force, pitching moment, rolling moment, and pre-computed solutions of the subsonic potential equation to determine first order wall interference corrections. Second order wall interference corrections for pitching and rolling moment coefficient are also determined. A new procedure is presented that estimates a rolling moment coefficient correction for wings with non-symmetric lift distribution. Experimental data obtained during the calibration of the Ames Bipod model support system and during tests of two semispan models mounted on an image plane in the NASA Ames 12 ft. Pressure Wind Tunnel are used to demonstrate the application of the wall interference correction method. Ulbrich, Norbert Ames Research Center NASA/CR-1998-208537, A-98-11989, NAS 1.26:208537 NAS2-13605...


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Product Details
  • ISBN-13: 9781724689047
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 208
  • Spine Width: 11 mm
  • Width: 216 mm
  • ISBN-10: 1724689045
  • Publisher Date: 04 Aug 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 494 gr


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