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Mechanical Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

1994

Aerospace engineering

Articles 1 - 2 of 2

Full-Text Articles in Mechanical Engineering

An Interacting Boundary Layer Method For Unsteady Compressible Flows , Robert Edwin Bartels Jan 1994

An Interacting Boundary Layer Method For Unsteady Compressible Flows , Robert Edwin Bartels

Retrospective Theses and Dissertations

A time accurate compressible interactive boundary layer procedure for airfoils using the quasi-simultaneous method of Veldman is developed. It couples the high frequency transonic small disturbance equation with the complete set of unsteady compressible boundary equations in Levy-Lees variable form, using a pseudo-time derivative of displacement thickness for enhanced stability. Included is a simple procedure for time accurately updating the viscous wake location. The basis of the interaction is an extension of the asymptotic matching condition of Davis for unsteady compressible interaction. This analysis identifies several possible unsteady transonic separation structures and highlights the importance of the pseudo-time derivative in ...


Design Of A Wing Section In Ground Effect: Application To High Speed Ground Transportation , Christoph Hiemcke Jan 1994

Design Of A Wing Section In Ground Effect: Application To High Speed Ground Transportation , Christoph Hiemcke

Retrospective Theses and Dissertations

This dissertation attempts to fully explain the aerodynamic ground effect phenomenon, which occurs when a wing flies over a nearby plane. The long-term motivation is to determine the feasibility of a train that achieves aerodynamic levitation above a flat guideway. Such a train would rely exclusively on lifting surfaces, rather than on steel wheels, lifting fans, or magnetic fields.;As a first step in the study of an aerodynamically suspended train, a wing section must be designed. This dissertation focuses on the preliminary design and the experimental investigation of a two-dimensional airfoil in ground effect. For application to high-speed ground ...