United States. National Advisory Committee for Aeronautics

Harvard Lomax

John R. Spreiter

George J. Heimerl

Chung-Hua Wu

Arthur W. Goldstein

William M. Roberts

S. S. Manson

Max. A. Heaslet

John D. Stanitz

Dean R. Chapman

Artur Mager

Loma Sluder

A. J. Eggers

John C. Evvard

Gaylord O. Ellis

Lincoln Wolfestein

Use of Source Distributions for Evaluating Theoretical Aerodynamics of Thin Finite Wings at Supersonic Speeds

From consideration of available information on boundary-layer behaviour, a relation among profile thickness, maximum surface velocity, Reynolds number, velocity diagram, and solidity is established for a cascade of airfoils immersed in a two-dimensional incompressible fluid flow. Several cascades are computed to show the effect of various cascade design parameters on minimum required cascade solidity.

Attainable Circulation of Airfoils in Cascade

The stability of a horizontal layer of fluid heated unsteadily from below and subjected to a time-dependent body force field was investigated theoretically, assuming an incompressible fluid with small density changes resulting from heating. A stability criterion is developed and used to calculate critical Rayleigh numbers, which are found to be much higher than for the static case, dependent only on the shape of the density profile, and independent of heating rate and Prandtl number. The initial motion corresponds to approximately the same cell shape as for the static case. Velocity growth increases from zero at the critical time at a rate proportional to the Prandtl number.

Stability of a Horizontal Fluid Layer with Unsteady Heating from Below and Time-dependent Body Force

Charles M. Goldstein

A Single-collision Model for Electron-beam Currents Between Plane Electrodes

Arthur W. Goldstein

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