NDLI: Unsteady two dimensional airloads acting on oscillating thin airfoils in subsonic ventilated wind tunnels

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Unsteady two dimensional airloads acting on oscillating thin airfoils in subsonic ventilated wind tunnels

Content Provider	NASA Technical Reports Server (NTRS)
Author	Golberg, M. Fromme, J.
Copyright Year	1978
Description	The numerical calculation of unsteady two dimensional airloads which act upon thin airfoils in subsonic ventilated wind tunnels was studied. Neglecting certain quadrature errors, Bland's collocation method is rigorously proved to converge to the mathematically exact solution of Bland's integral equation, and a three way equivalence was established between collocation, Galerkin's method and least squares whenever the collocation points are chosen to be the nodes of the quadrature rule used for Galerkin's method. A computer program displayed convergence with respect to the number of pressure basis functions employed, and agreement with known special cases was demonstrated. Results are obtained for the combined effects of wind tunnel wall ventilation and wind tunnel depth to airfoil chord ratio, and for acoustic resonance between the airfoil and wind tunnel walls. A boundary condition is proposed for permeable walls through which mass flow rate is proportional to pressure jump.
File Size	3823626
Page Count	139
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19780013116
Archival Resource Key	ark:/13960/t7kq2t06t
Language	English
Publisher Date	1978-05-01
Access Restriction	Open
Subject Keyword	Aerodynamics Subsonic Wind Tunnels Acoustic Properties Mass Flow Rate Collocation Least Squares Method Wind Tunnel Tests Thin Airfoils Mathematical Models Galerkin Method Wind Tunnel Walls Aerodynamic Loads Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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