Download or read book Non steady Hydrodynamic Characteristics of a Supercavitating Hydrofoil Under a Free Surface written by C. C. Hsu and published by . This book was released on 1964 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present report is a sequel to an earlier report (AD-601 100). The principal interest here is to clarify, both qualitatively and quantitatively, the influence of a free surface on the non-steady two-dimensional hydrodynamic characteristics of supercavitating hydrofoils. Heaving, pitching, and flapping motions are considered. It is found that, in general, the added mass forces and moments depend only slightly on the submergence depthchord ratio of the hydrofoil. However, the other non-steady forces and moments vary appreciably with the depth of submersion. At a depth-chord ratio of unity (typical value) the non-steady characteristics are not well approximated by either the deeply submerged or surfaced hydrofoil results. The prediction of hydrofoil flutter or of transient foil or flap response will thus depend very much on the hydrofoil submergence. Detailed numerical results for unsteady response, based on digital machine calculation, are given. (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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1964 with total page 856 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 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 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 U S Government Research Reports written by and published by . This book was released on 1964 with total page 1076 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 1965 with total page 1534 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 Report written by United States. National Bureau of Standards and published by . This book was released on 1968 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Bureau of Standards Miscellaneous Publication written by and published by . This book was released on 1959 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1961 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States written by and published by . This book was released on 1965 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Hydraulic Laboratory Research in the United States written by and published by . This book was released on 1966 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Miscellaneous Publication National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1934 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States written by United States. National Bureau of Standards and published by . This book was released on 1963 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Unsteady Propeller Forces Fundamental Hydrodynamics and Unconventional Propulsion written by Ralph D. Cooper and published by . This book was released on 1971 with total page 1700 pages. Available in PDF, EPUB and Kindle. Book excerpt: