AERODYNAMIC STUDIES:The Forces Acting On An Air Vehicle, A Review of the Literature

摘要

This work is an annotated bibliography of the scientific literature pertaining to methods of calculating the aerodynamic forces acting on an air vehicle in flight. The present segment of the work includes material reviewed by the author in the period October 1954 through December 1954. The more interesting papers and reports (from the viewpoint of the aerodynamicist) are discussed briefly; others are listed without comment.nPB161024nA criterion has been formulated for the prediction of the type of transient-repetitive short arcs or glow-to be expected between separating contacts interrupting a current too small to cause drawing-out of an arc. In simple form, the criterion is that when the current calculated for an assumed glow transient, using a formula based on an idealized relationship of voltage and current involving constant parameters, is less than a critical current, a glow discharge forms, and when the calculated current is greater, an arc discharge forms. If a glow discharge occurs, the energy in the circuit is sufficiently dissipated at the end of this discharge that only circuit oscillations follow. If an arc occurs, generally energy conditions in the circuit will be such that the gap voltage rebuilds to the breakdown potential; and usually this occurs a number of times resulting in a series of arcs. In order to evaluate the merit of the criterion and the assumed parameters, transients were observed experimentally in the simple circuit on which the analysis was based and compared with the calculated transients. The agreement found between the two encourages confidence in the basic assumptions that permitted selections of a criterion and of discharge parameters.