Investigation Of Wings In Ground Effect Using Computational Fluid Dynamics
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Author |
: Gulraiz Ahmed |
Publisher |
: GRIN Verlag |
Total Pages |
: 91 |
Release |
: 2012-07-05 |
ISBN-10 |
: 9783656230465 |
ISBN-13 |
: 3656230463 |
Rating |
: 4/5 (65 Downloads) |
Synopsis Investigation of Wings in Ground Effect using Computational Fluid Dynamics by : Gulraiz Ahmed
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.
Author |
: |
Publisher |
: |
Total Pages |
: |
Release |
: 2012 |
ISBN-10 |
: OCLC:917120899 |
ISBN-13 |
: |
Rating |
: 4/5 (99 Downloads) |
Synopsis A Computational Fluid Dynamic Study of the Aerodynamic Behaviour of Various Aspect Ratio Wings in Ground Effect by :
Author |
: Liang Yun |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 459 |
Release |
: 2009-12-03 |
ISBN-10 |
: 9781441900425 |
ISBN-13 |
: 144190042X |
Rating |
: 4/5 (25 Downloads) |
Synopsis WIG Craft and Ekranoplan by : Liang Yun
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.
Author |
: Kirill V. Rozhdestvensky |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 358 |
Release |
: 2013-03-09 |
ISBN-10 |
: 9783662042403 |
ISBN-13 |
: 3662042401 |
Rating |
: 4/5 (03 Downloads) |
Synopsis Aerodynamics of a Lifting System in Extreme Ground Effect by : Kirill V. Rozhdestvensky
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Author |
: Sheila E. Widnall |
Publisher |
: |
Total Pages |
: 50 |
Release |
: 1969 |
ISBN-10 |
: OCLC:13506411 |
ISBN-13 |
: |
Rating |
: 4/5 (11 Downloads) |
Synopsis An Analytic Solution for Two- and Three-dimensional Wings in Ground Effect by : Sheila E. Widnall
The method of matched asymptotic expansions is applied to the problem of a ram wing of finite span in very close proximity to the ground. The general lifting surface problem is shown to be a direct problem, represented by a source-sink distribution on the upper surface of the wing and wake, with concentrated sources around the leading and side edges plus a separate confined channel flow region under the wing and wake. The two-dimensional flat plate airfoil is examined in detail and results for upper and lower surface pressure distribution and lift coefficient are compared with a numerical solution. A simple analytic solution is obtained for a flat wing with a straight trailing edge which has minimum induced drag. To lowest order, this optimally loaded wing is an elliptical wing with a lift distribution which is linear along the chord. The resultant total spanwise lift distribution is parabolic. An expression for the lift coefficient at small clearance and angle of attack, valid for moderate aspect ratio, is derived. The analytic results are compared with numerical results from lifting surface theory for a wing in ground effect; reasonable agreement is obtained. (Author).
Author |
: John W. Paulson |
Publisher |
: |
Total Pages |
: 172 |
Release |
: 1982 |
ISBN-10 |
: UIUC:30112101593413 |
ISBN-13 |
: |
Rating |
: 4/5 (13 Downloads) |
Synopsis An Experimental and Theoretical Investigation of Thick Wings at Various Sweep Angles in and Out of Ground Effect by : John W. Paulson
Author |
: James L. Thomas |
Publisher |
: |
Total Pages |
: 56 |
Release |
: 1979 |
ISBN-10 |
: NASA:31769000543481 |
ISBN-13 |
: |
Rating |
: 4/5 (81 Downloads) |
Synopsis Powered Low-aspect-ratio Wing In Ground Effect (WIG) Aerodynamic Characteristics by : James L. Thomas
Author |
: Jonathan David Chaim Zerihan |
Publisher |
: |
Total Pages |
: 218 |
Release |
: 2001 |
ISBN-10 |
: OCLC:59466004 |
ISBN-13 |
: |
Rating |
: 4/5 (04 Downloads) |
Synopsis An investigation into the aerodynamics of wings in ground effect by : Jonathan David Chaim Zerihan
Author |
: |
Publisher |
: |
Total Pages |
: 172 |
Release |
: 1982 |
ISBN-10 |
: NASA:31769000435100 |
ISBN-13 |
: |
Rating |
: 4/5 (00 Downloads) |
Synopsis An Experimental and Theoretical Investigation of Thick Wings at Various Sweep Angles in and Out of Ground Effect by :
Author |
: Jiyuan Tu |
Publisher |
: Butterworth-Heinemann |
Total Pages |
: 458 |
Release |
: 2012-11-07 |
ISBN-10 |
: 9780080982434 |
ISBN-13 |
: 0080982433 |
Rating |
: 4/5 (34 Downloads) |
Synopsis Computational Fluid Dynamics by : Jiyuan Tu
An introduction to CFD fundamentals and using commercial CFD software to solve engineering problems, designed for the wide variety of engineering students new to CFD, and for practicing engineers learning CFD for the first time. Combining an appropriate level of mathematical background, worked examples, computer screen shots, and step by step processes, this book walks the reader through modeling and computing, as well as interpreting CFD results. The first book in the field aimed at CFD users rather than developers. New to this edition: A more comprehensive coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method. Coverage of different approaches to CFD grid generation in order to closely match how CFD meshing is being used in industry. Additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used. 20% new content .