Download or read book Linearized Theory for Thin Supercavitating Hydrofoils with Spoiler flaps Operating at High Speeds Beneath a Free Surface written by C. F. CHEN and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The linearized problem of flow past a flat plate with a deflected upper flap is solved including the free surface effects. The flow is assumed to detach at the trailing edges of the flap and of the plate leaving an infinite cavity of constant pressure behind. The results are applicable to flaps of arbitrary length, hinged at arbitrary distance from the leading edge and at arbitrary depth. Numerical results are presented to show the effect of depth on the lift and drag coefficients of a trailing edge flap whose chord is 30% of the chord of the plate, the effect of the hinge position of such a flap on the hydrodynamic characteristics of a plate at infinite depth, and the pressure distribution on a flapped plate at infinite depth. The principal results obtained are: as the depth decreases, the flap becomes less effective and less efficient; as the hinge position is moved rearward, the flap becomes more effective and more efficient. (Autho).
Download or read book THE LINEARIZED THEORY FOR SUPERCAVITATING HYDROFOILS OPERATING AT HIGH SPEEDS NEAR A FREE SURFACE written by and published by . This book was released on 1961 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Linearized cavity flow theory, in conjunction with a mapping technique, is used to develop general expressions for the characteristics of supercavitating or fully ventilated, two dimensional hydrofoils with prescribed pressure distributions, designed for operation near a free surface. It is assumed that the hydrofoils Are operating at zero cavitation number and that the Froude number - based on depth - is very large. The general expressions are used to derive the lift, cavity drag and shape of hydrofoils composed of 2-, 3-, and 5-term and constant pressure camber configurations, combined with angle of attack and quasi-parabolic thickness and designed for operation at specific depths. Examples of numerical results are given and the effect of foil strength is discussed and evaluated.
Download or read book Theoretical and Experimental Investigation of Supercavitating Hydrofoils Operating Near the Free Water Surface written by Virgil E. Johnson and published by . This book was released on 1961 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1962 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1963 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavitation in Real Liquids written by Robert Davies and published by . This book was released on 1964 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrofoils unclassified Title written by Defense Documentation Center (U.S.) and published by . This book was released on 1962 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Experimental Investigation of Supercavitating Hydrofoils Operating Near the Free Water Surface written by and published by . This book was released on 1961 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Linearized Theory for a Supercavitating Hydrofoil Operating in a Fluid of Finite Depth written by Hung-Ta Ho and published by . This book was released on 1963 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study applies linearized theory to a two dimensional, uniform, supercavitating flow passing over a hydrofoil operating near the surface of a fluid of finite depth. The problem is formulated in the region of the lower half of a transformed plane, and the formulation is applicable to foils of any shape within the scope of the linearized theory and of any location between the free surface and the bottom of the channel. For the case of a flat plate the solution is obtained in terms of Legendre elliptic integrals. Numerical calculations are made for the lift and moment coefficients of the foil immersed at several different distances under the free surface with varying water depths. (Author).
Download or read book U S Government Research Reports written by and published by . This book was released on 1961 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical Determination of Low drag Supercavitating Hydrofoils and Their Two dimensional Characteristics at Zero Cavitation Number written by Virgil E. Johnson and published by . This book was released on 1957 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Two new low-drag hydrofoils for operation at zero cavitation number are derived by the application of the Tulin-Burkart linearized theory. The two-dimensional lift-drag ratios of these two hydrofoils operating at design angle of attack are shown to be, theoretically, about 45 and 80 percent greater than the Tulin-Burkart configuration. A simplified calculation of the location of the upper cavity streamline for arbitrary configurations is also presented.
Download or read book Theoretical and Experimental Investigation of Arbitrary Aspect Ratio Supercavitating Hydrofoils Operating Near the Free Water Surface written by Virgil E. Johnson and published by . This book was released on 1957 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The existing two-dimensional theory for the characteristics of supercavitating hydrofoils operating at zero cavitation number is modified to include the effects of camber, aspect ratio, and depth of submersion. For a comparison with the theory, two aspect-ratio-1 hydrofoils, a flat plate and one with a cambered lower surface, were tested by operating them near the water surface so that their upper surfaces were completely ventilated. The data obtained verified the theory to within 3 percent. Some experimental data are also presented for the models operating at nonzero cavitation number for both air and water-vapor-filled cavities.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fully Cavitating Hydrofoils in Non steady Motion Under a Free Surface written by C. C. Hsu and published by . This book was released on 1963 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A linearized theory is developed for unsteady two-dimensional cavity flow about thin hydrofoils at zero cavitation number. Expressions are presented for the lift and moment coefficients of a thin supercavitating foil performing arbitrary oscillations, in terms of the coefficient of a power series describing the chordwise amplitude distribution. They are applied to the case of a rigid foil performing heaving and pitching oscillations and to that of oscillating flaps. For very large depth-chord ratios, the lift and moment coefficients for pure heaving and pitching oscillations are identical to those obtained by previous workers. (Author).
Download or read book Experimental Investigation of a Supercavitating Hydrofoil with Upper Surface Spoiler Flaps written by Otto J. Scherer and published by . This book was released on 1964 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of lift and drag measurements performed on a 2 1/2 in. chord model of the BuShips Parent Supercavitating Hydrofoil without flaps and with full span spoiler flaps. The tests were conducted in the high-speed, variable pressure, free surface, circulating water channel. They cover angles of attack ranging from 2.5 to 12.8 degrees, vapor cavitation numbers from 0.075 to 1.38 and operating depths of 1/2 and 1 chord. The velocity during these tests was between 39 and 42 fps. Each of the three flaps parameters: flap deflection, flap/chord ratio, and flap trailing edge location, were varied in three steps while the other two parameters were held relatively constant. The results are presented in the form of graphs showing the variation of lift and drag with cavitation number and angle of attack. Graphs showing the reduction in lift due to the spoiler for each spoiler geometry and several cavitation numbers are also included. It is found that the upper surface spoiler flap is an effective way of reducing lift and that a discontinuity in lift at the ventilation inception angle can be avoided by proper selection of flap parameters. (Author).
Download or read book On the Existence of Zero Form drag and Hydrodynamically Stable Supercavitating Hydrofoils written by R. Oba and published by . This book was released on 1965 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Two Low drag Supercavitating Hydrofoils at Speeds Up to 200 Feet Per Second written by Kenneth W. Christopher and published by . This book was released on 1960 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
