National Advisory Committee for Aeronautics (NACA) - 16 Matching Results

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Ambient pressure determination at high altitudes by use of free-molecule theory

Description: From Introduction: "Several methods (references 1 and 2) based on gas-dynamic principles are available for reducing such measurements. The results obtained by these methods are subject to the limitation of the gas-dynamic theory which is that the mean free path of the molecules between impacts, is small with respect to the measuring device. Inasmuch as no information on the subject is to present known to be available, the purpose of the present paper is to present a method based on the concept of free-molecule theory for use in connection with this problem."
Date: March 1, 1949
Creator: Wiener, Bernard
Partner: UNT Libraries Government Documents Department

Recommended Values of Meteorological Factors to Be Considered in the Design of Aircraft Ice-Prevention Equipment

Description: Meteorological conditions conducive to aircraft icing are arranged in four classifications: three are associated with cloud structure and the fourth with freezing rain. The range of possible meteorological factors for each classification is discussed and specific values recommended for consideration in the design of ice-prevention equipment for aircraft are selected and tabulated. The values selected are based upon a study of the available observational data and theoretical considerations where observations are lacking. Recommendations for future research in the field are presented.
Date: March 1, 1949
Creator: Jones, Alun R & Lewis, William
Partner: UNT Libraries Government Documents Department

Investigation of downwash and wake characteristics at a Mach number of 1.53 1: rectangular wing

Description: The results of an experimental investigation of the downwash and wake characteristics behind a rectangular plan-form wing of aspect ratio 3.5 are presented. The airfoil section was a 5-percent-thick, symmetrical double wedge. The tests were made at a Mach number of 1.53 and a Reynolds number of 1.25 million. A comparison between experimental and theoretical values of the downwash angles is made.
Date: March 1, 1949
Creator: Perkins, Edward W. & Canning, Thomas N.
Partner: UNT Libraries Government Documents Department

Flow Pattern in a Converging-Diverging Nozzle

Description: The present report describes a new method for the prediction of the flow pattern of a gas in the two-dimensional and axially symmetrical case. It is assumed that the expansion of the gas is adiabatic and the flow stationary. The several assumptions necessary of the nozzle shape effect, in general, no essential limitation on the conventional nozzles. The method is applicable throughout the entire speed range; the velocity of sound itself plays no singular part. The principal weight is placed on the treatment of the flow near the throat of a converging-diverging nozzle. For slender nozzles formulas are derived for the calculation of the velocity components as function of the location.
Date: March 1, 1949
Creator: Oswatitsch, K. & Rothstein, W.
Partner: UNT Libraries Government Documents Department

The Characteristics Method Applied to Stationary Two-Dimensional and Rotationally Symmetrical Gas Flows

Description: By means of characteristics theory, formulas for the numerical treatment of stationary compressible supersonic flows for the two-dimensional and rotationally symmetrical cases have been obtained from their differential equations.
Date: March 1, 1949
Creator: Pfeiffer, F. & Meyer-Koenig, W.
Partner: UNT Libraries Government Documents Department

Calculation of Counterrotating Propellers

Description: A method for calculation of a counterrotating propeller which is similar to Walchner's method for calculation of the single propeller in the free air stream is developed and compared with measurements. Several dimensions which are important for the design are given end simple formulas for the gain in efficiency derived. Finally a survey of the behavior of the propeller for various operating conditions is presented.
Date: March 1, 1949
Creator: Ginzel, F.
Partner: UNT Libraries Government Documents Department