Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1920. / The entire thesis text is included in file. Typescript. Illustrated by author, except for photographs. Title from title screen of thesis/dissertation PDF file (viewed May 13, 2009)

Thesis (M. Sc.)--University of Hong Kong, 1998. / Includes bibliographical references (leaf 40-42).

Thesis (M. Sc.)--University of Hong Kong, 1998. / Includes bibliographical references (leaf 42-43).

Wall correction theories for two-dimensional airfoils in wind tunnels with partly open walls are examined. Conventional wall correction theories are linearized theories, valid only for small thin models of slight camber at low angles of attack. Such theories are shown to be useless for the prediction of the required wall corrections for large models, models at high angles of attack, or models developing high lift. An exact numerical theory is presented in which it is not necessary to make these assumptions. The airfoil and any solid wall sections are represented by surface source and vortex singularities as in the method of A.M.O. Smith. Aerodynamic lift is determined by numerical integration of the calculated pressure distributions around the airfoil contour. The theory indicates that certain wall configurations will require small or negligible wall corrections for tests on lifting airfoils. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

This thesis deals with a new approach to reduce wall corrections in high-lift airfoil testing, by employing two similar non-uniform transversely slotted walls. The solid elements of the slotted wall are symmetrical airfoils at zero incidence, and the spaces between the slats are non-uniform, increasing linearly towards the rear. This wall configuration provides the flow conditions close to the free air test environment which lead to negligible or small wall corrections. The theory uses the potential flow surface vortex-element method, with "Full Load" Kutta Conditions satisfied on the test airfoil and wall slats. This method is very well supported by physical evidence and it is simple to use. The surface velocities can be calculated directly and the aerodynamic lift and pitching moment are determined by numerical integration of the calculated pressure distributions around the airfoil contour. This method can be developed to include a simulation of the flow in the plenum chambers in the analysis. Also, the performance of this new wall configuration was examined experimentally. Two different sizes of NACA-0015 airfoil were tested in the existing low speed wind tunnel after modifying both the configuration of the side walls and the test section to accommodate the new test. Pressure distributions about the test airfoils were measured using pressure taps around their contours. Also the lifts and the pitching moments were obtained by integrating the measured surface pressures. The experimental, results show that the use of the new wall configuration with AOAR = 59% would produce wind tunnel test data very close to the free air values. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

Thèse doctorat : Génie Civil : Villeurbanne, INSA : 2002. / Titre provenant de l'écran-titre. Bibliogr. p. 289-299.

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Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references.

Thesis (M. Sc.)--University of Hong Kong, 1994. / Includes bibliographical references (leaves 44-46).

published_or_final_version / Civil Engineering / Master / Master of Philosophy