National Advisory Committee for Aeronautics (NACA) - 89 Matching Results

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Experimental investigations on freely exposed ducted radiators

Description: This report deals with the relation between the open areas, the drag, and the air flow as observed on freely exposed, ducted radiators - the air conductivity being modified from zero to one unit. In conjunction with theoretical results, the individual components of the drag of ducted radiators are discussed and general rules established for low-loss ducts. The influence of the wall thickness of the ducts, of the length ratio of the exit, and the effects of sonic velocity on diffusers are dealt with by special measurement.
Date: March 1, 1941
Creator: Linke, W
Partner: UNT Libraries Government Documents Department

Use of charts for flow discharge calculations

Description: Various problems in connection with engine design involve flow-discharge calculations which are rendered difficult both on account of the large number of external variables that enter into the computation - i.e., changes in discharge area during the process, change in volume of the cylinder, pressure, etc., and changes in the thermal constants themselves of the flow medium. A fairly accurate solution that does not involve an excessive amount of labor can be obtained only through the extensive use of i-s tables. In the present report, a solution is offered in the form of a different method making use of the I-S table of Lutz and Wolf.
Date: March 1, 1941
Creator: Lutz, O
Partner: UNT Libraries Government Documents Department

The elliptic wing based on the potential theory

Description: This article is intended as a contribution to the theory of the lifting surface. The aerodynamics of the elliptic wing in straight and oblique flow are explored on the basis of potential theory. The foundation of the calculation is the linearized theory of the acceleration potential in which all small quantities of higher order are disregarded.
Date: March 1, 1941
Creator: Krienes, Klaus
Partner: UNT Libraries Government Documents Department

Electrical equipment for the experimental study of the dynamics of fluids

Description: This report contains the description of electric anemometers and their application to the study of turbulent fluid flows, of electric tanks for the realization of the analogies between electrology and aerodynamics and their application to the study of varied technical problems, and lastly of the electric condenser type dynamometer and its application to the prediction of the aerodynamic forces on wing and airplane models in wind-tunnel tests and in controlled and spontaneous rotations.
Date: March 1, 1942
Creator: Ferrari, Carlo
Partner: UNT Libraries Government Documents Department

Force and pressure-distribution measurements on a rectangular wing with a slotted droop nose and with either plain and split flaps in combination or a slotted flap.

Description: Force measurements and pressure distribution measurements on the midsection were made on a rectangular wing with slotted droop nose and end plates, on which could be placed a choice of either a plain flap-split flap combination or a slotted flap. (author).
Date: March 1, 1947
Creator: Lemme, H G
Partner: UNT Libraries Government Documents Department