Download or read book The Linearized Theory of a Supercavitating Hydrofoil with a Jet Flap written by HUNG-TA. HO and published by . This book was released on 1961 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical analysis is carried out for the steady cavity flow about thin hydrofoil sections at small incidence alpha, at the trailing edge of which a thin jet emerges at a small deflection pi. The flow is assumed to be inviscid and incompressible and the cavitation number is taken to be zero. The jet is assumed so thin that it can be considered as a vortex sheet across which the velocity is discontinuous. For the case of a flat plate, expressions have been obtained for lift, drag, pressure distribution, pitching moment, the jet shape and the cavity shape. Numerical calculations are made for a number of jet momentum-flux coefficients C sub J lying between 0.01 and 5. (Author).
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 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 Some Experiments on a Supercavitating Plane Hydrofoil with Jet flap written by Nguyen Ngoc Dinh and published by . This book was released on 1969 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the supercavitating flow around a plane hydrofoil equipped with a jet-flap at the trailing edge was carried out in a water tunnel in which the working section has rigid walls. Results are presented for a range of cavitation numbers between 0.3 and 1.2, and for jet momentum coefficients up to 0.5. The pressure forces exerted on the model were calculated from the measured distributions of static pressure on the surface of the model. The effect of the jet-flap on the pressure force at large volues of cavitation numbers is seen to be much less than that predicted by the linearized theory of Ho for zero cavitation number. (Author).
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 Second order Supercavitating Hydrofoil Theory written by Chuan Fang Chen and published by . This book was released on 1961 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second-order problem of Helmholtz flow past lifting hydrofoils and symmetric struts was formulated and solved. The solution involves elementary operations on the known solutions of the first-order problem. The second-order lift and drag coefficients are given in integral form. Results obtained for a flat plate at incidence and a symmetric wedge agree with the exact solutions up to the second order. (Author).
Download or read book Experiments on a Jet Flap in Supercavitating Flow written by Edward Silberman and published by . This book was released on 1964 with total page 102 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 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamic and Aerodynamic Characteristics of a Model of a Supersonic Multijet Water based Aircraft Equipped with Supercavitating Hydrofoils written by Robert E. McKann and published by . This book was released on 1960 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A LINEARIZED THEORY FOR THE UNSTEADY MOTION OF A SUPERCAVITATING HYDROFOIL written by J.A. Geurst and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Performance of Supercavitating Hydrofoils with Flaps with Special Reference to Leakage and Optimization of Flap Design written by R. Oba and published by . This book was released on 1965 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modified linearized theory was developed for supercavitating, flapped foils of arbitrary form in which effects of fluid leakage through the flap hinge were considered. It was found that the performance at conditions other than design conditions was improved with the use of trailing edge flaps. The drag-lift ratio may be reduced by a factor of 1/2 to 1/3. The foil performance is dependent on the flap-chord ratio, e, and the flap deflection, performance increasing with small e. Effects produced by leakage through the flap hinge were significant in their influence on velocity distribution and flap effectiveness (increment in lift coefficient per unit change in flap angle). The effect of hinge leakage on the overall performance, i. e., lift, drag, and moment, was small and may be neglected in most cases. (Author).
Download or read book Improved First order Supercavitating Theory written by P. Ward Brown and published by . This book was released on 1963 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional first-order supercavitating hydro foil theory is reviewed, and it is shown that, by avoiding the usual linearization of the physi cal plane, general expressions for improved force coefficients may be obtained in terms of the con ventional first-order coefficients. Specific examples are given including supercavitating flow about a cambered hydrofoil, a symmetric wedge and a flat-plate hydrofoil with flap. Comparison with exact solutions shows that the improved first order lift is generally within 5%, for angles up to 90. (Author).
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 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 On the linear Theory of cascades of supercavitating hydrofoils written by G. A. Duller and published by . This book was released on 1966 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
