National Advisory Committee for Aeronautics (NACA) - 4 Matching Results

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Characteristics of a 15-percent-chord and a 35-percent-chord plain flap on the NACA 0006 airfoil section at high subsonic speeds
No Description Available.
Free-fall measurements at transonic velocities of the drag of a wing-body configuration consisting of a 45 degree swept-back wing mounted forward of the maximum diameter on a body of fineness ratio 12
Report presenting the drag of a series of complete airplane-like configurations and their components at transonic velocities using the free-fall method. The configuration tested in this report has a 45 degree sweptback wing of aspect ratio 4.1 mounted forward of the maximum diameter of a 10-inch-diameter body of fineness ratio 12 equipped with stabilizing tail fins. Results are presented as curves showing the variation of drag coefficient with Mach number for the complete configuration and for each component.
Investigation of axial-flow fan and compressor rotors designed for three-dimensional flow
From Summary: "An investigation has been conducted to determine whether three-dimensional flows may be utilized in axial-flow fan and compressor rotors so that the spanwise load distribution may be varied to obtain high pressure rise. Two rotors, one with approximately uniform and one with solid-body downstream tangential-velocity distributions, were designed and tested at the design blade angle."
A Theory of Unstaggered Airfoil Cascades in Compressible Flow
By use of the methods of thin airfoil theory, which include effects of compressibility, relations are developed which permit the rapid determination of the pressure distribution over an unstaggered cascade of airfoils of a given profile, and the determination of the profile shape necessary to yield a given pressure distribution for small chord gap ratios, For incompressible flow the results of the theory are compared with available examples obtained by the more exact method of conformal transformation. Although the theory is developed for small chord/gap ratios, these comparisons show that it may be extended to chord/gap ratios of order unity, at least for low speed flows. Choking of cascades, a phenomenon of particular importance in compressor design, is considered.