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Book Effect of Configuration on the Measured Performance of a Power Augmented Wing in Ground Effect

Download or read book Effect of Configuration on the Measured Performance of a Power Augmented Wing in Ground Effect written by George H Kidwell (Jr) and published by . This book was released on 1977 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis is performed to determine the effects of configuration upon the performance of a power augmented ram wing in ground effect (PAR WIG) aircraft. The results of two testing programs are investigated for changes in performance due to changes in flap angle, fan angle, angle of attack, aspect ratio, wing loading, thrust-weight ratio, fan density, and water roughness. Performance is assessed through the vehicle's transport efficiency and heave, along with discussion of the acceleration characteristics of these varied configurations. Aside from the numerical conclusions which are made concerning the vehicle parametrics, it was found that operation of the vehicle in waves of significant height up to 1/10 span does not significantly degrade a PAR WIG's performance. Numerical results are included to aid performance prediction for a given configuration. (Author).

Book Aerodynamics of a Lifting System in Extreme Ground Effect

Download or read book Aerodynamics of a Lifting System in Extreme Ground Effect written by Kirill V. Rozhdestvensky and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to the memory of a distinguished Russian engineer, Rostislav E. Alexeyev, who was the first in the world to develop the largest ground effect machine - Ekranoplan. One of Alexeyev's design concepts with the aerodynamic configuration of a jlying wing can be seen on the front page. The book presents a description of a mathematical model of flow past a lifting system, performing steady and unsteady motions in close proximity to the underlying solid surface (ground). This case is interesting for practical purposes because both the aerodynamic and the economic efficiency of the system near the ground are most pronounced. Use of the method of matched asymptotic expansions enables closed form solutions for the aerodynamic characteristics of the wings-in-ground effect. These can be used for design, identification, and processing of experimental data in the course of developing ground effect vehicles. The term extreme ground effect, widely used through out the book, is associated with very small relative ground clearances of the order of 10% or less. The theory of a lifting surface, moving in immediate proximity to the ground, represents one of the few limiting cases that can be treated analytically. The author would like to acknowledge that this work has been influenced by the ideas of Professor Sheila E. Widnall, who was the first to apply the matched asymptotics techniques to treat lifting flows with the ground effect. Saint Petersburg, Russia February 2000 Kirill V. Rozhdestvensky Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Book Investigation of Wings in Ground Effect using Computational Fluid Dynamics

Download or read book Investigation of Wings in Ground Effect using Computational Fluid Dynamics written by Gulraiz Ahmed and published by GRIN Verlag. This book was released on 2012-07-05 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2008 in the subject Engineering - Aerospace Technology, grade: A, University of Southampton, course: Computational Aerodynamics, language: English, abstract: Wing-in-ground effect (WIG) vehicles offer an exciting capability to fill the enormous void between speed of an aircraft and the payload capacity of a ship. WIG vehicles would be able to move cargo and passengers faster than a ship and more economical than an aircraft. Ground effect is a phenomenon that occurs on all wings flying close to the ground or a surface. The aim of this project is to investigate the behavior of wings (NACA/DHMTU series) in ground effect (on a fixed/variable terrain) using Fluent CFD package. The NACA 0012 and DHMTU series used in this project are designed specifically to fly in close proximity to the ground. The performance of the NACA/ DHMTU airfoils is examined for the lift and the drag coefficients at different altitudes with varying angle of attack. The results are compared to experimental data that is available to assess the accuracy of the CFD simulation.

Book Technical Abstract Bulletin

Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aerodynamic Performance of a Wing in Ground Effect Using the PANAIR Program

Download or read book Aerodynamic Performance of a Wing in Ground Effect Using the PANAIR Program written by A. R. Goetz and published by . This book was released on 1984 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this thesis is to correlate computed theoretical data with experimentla data for wings in ground effect. This investigation uses the PANAIR computer program--a higher-order panel method to predict the lift and drag characteristics of an aspect ratio two wing, with and without endplates, operating at low speed in ground effect. The effects of altitude, trailing edge flap deflection and angle of attack are considered. Numerical results are compared with subsonic wind tunnel experimental data. For both the numerical and experimental methods, the image model technique is used to simulate ground effect. Excellent agreement between numerical results and experimental data is achieved for the wing without endplates down to low (approximately 10% of wing chord) altitudes. For the wing with endplates, numerical results are in good agreement with experimental data for altitudes greater than approximately 20% of the wing chord. PANAIR results diverged from experimental data at lower altitudes because the model did not attempt to account for spanwise flow between the bottom of the endplate and the ground, and other viscous effects which tend to become dominant. These include a static pressure increase beneath the wing and wake distortions behind the configuration. Keywords include: Aspect ratio, WIG(Wing in Ground Effect), Life coefficients, Life drag ratio, and Inviscid theory.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book WIG Craft and Ekranoplan

Download or read book WIG Craft and Ekranoplan written by Liang Yun and published by Springer Science & Business Media. This book was released on 2009-12-03 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last half-century, high-speed water transportation has developed rapidly. Novel high-performance marine vehicles, such as the air cushion vehicle (ACV), surface effect ship (SES), high-speed monohull craft (MHC), catamaran (CAT), hydrofoil craft (HYC), wave-piercing craft (WPC) and small water area twin hull craft (SWATH) have all developed as concepts, achieving varying degrees of commercial and military success. Prototype ACV and SES have achieved speeds of 100 knots in at calm con- tions; however, the normal cruising speed for commercial operations has remained around 35–50 knots. This is partly due to increased drag in an average coastal s- way where such craft operate services and partly due to limitations of the propulsion systems for such craft. Water jets and water propellers face limitations due to c- itation at high speed, for example. SWATH are designed for reduced motions in a seaway, but the hull form is not a low drag form suitable for high-speed operation. So that seems to lead to a problem – maintain water contact and either water propulsion systems run out of power or craft motions and speed loss are a problem in higher seastates. The only way to higher speed would appear to be to disconnect completely from the water surface. You, the reader, might respond with a question about racing hydroplanes, which manage speeds of above 200 kph. Yes, true, but the power-to-weight ratio is extremely high on such racing machines and not economic if translated into a useful commercial vessel.

Book Analysis of the Stability of a Wing Flying in Ground Effect

Download or read book Analysis of the Stability of a Wing Flying in Ground Effect written by David T. Turner and published by . This book was released on 1997 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aerodynamic Analysis of Ultra High Capacity Wing in Ground Effect Craft

Download or read book Aerodynamic Analysis of Ultra High Capacity Wing in Ground Effect Craft written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Collection of Technical Papers

Download or read book A Collection of Technical Papers written by and published by . This book was released on 1981 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aeronautical Engineering

Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Theory of Wing Sections

Download or read book Theory of Wing Sections written by Ira H. Abbott and published by Courier Corporation. This book was released on 2012-04-26 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concise compilation of subsonic aerodynamic characteristics of NACA wing sections, plus description of theory. 350 pages of tables.