Aerodynamics Of A Lifting System In Extreme Ground Effect

Author : Kirill V. Rozhdestvensky
Publisher : Springer Science & Business Media
Page : 358 pages
File Size : 54,5 Mb
Release : 2013-03-09
Category : Technology & Engineering
ISBN : 9783662042403

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Aerodynamics of a Lifting System in Extreme Ground Effect by Kirill V. Rozhdestvensky Pdf

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 : Jochen Wild
Publisher : CRC Press
Page : 372 pages
File Size : 52,7 Mb
Release : 2022-02-03
Category : Technology & Engineering
ISBN : 9781000532623

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High-Lift Aerodynamics by Jochen Wild Pdf

This book presents a detailed look at high-lift aerodynamics, which deals with the aerodynamic behavior of lift augmentation means from various approaches. After an introductory chapter, the book discusses the physical limits of lift generation, giving the lift generation potential. It then explains what is needed for an aircraft to fly safely by analyzing the high-lift-related requirements for certifying an aircraft. Aircraft needs are also analyzed to improve performance during takeoff, approach, and landing. The book discusses in detail the applied means to increase the lift coefficient by either passive and active high-lift systems. It includes slotless and slotted high-lift flaps, active and passive vortex generating devices, boundary and circulation control, and powered lift. Describing methods that are used to evaluate and design high-lift systems in an aerodynamic sense, the book briefly covers numerical as well as experimental simulation methods. It also includes a chapter on the aerodynamic design of high-lift systems. FEATURES Provides an understanding of the physics of flight during takeoff and landing from aerodynamics to flight performance and from simulation to design Discusses the physical limits of lift generation, giving the lift generation potential Concentrates on the specifics of high-lift aerodynamics to provide a first insight Analyzes aircraft needs to improve performance during takeoff, approach, and landing Focuses on civil transport aircraft applications but also includes the associated physics that apply to all aircraft This book is intended for graduate students in aerospace programs studying advanced aerodynamics and aircraft design. It also serves as a professional reference for practicing aerospace and mechanical engineers who are working on aircraft design issues related to takeoff and landing.

Author : Paul A. Baker,William G. Schweikhard,William Raymond Young
Publisher : Unknown
Page : 52 pages
File Size : 50,5 Mb
Release : 1970
Category : Aerodynamics
ISBN : UIUC:30112106880930

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Flight Evaluation of Ground Effect on Several Low-aspect-ratio Airplanes by Paul A. Baker,William G. Schweikhard,William Raymond Young Pdf

A constant-angle-of-attack-approach technique was used to measure ground effect on several low -aspect-ratio aircraft. The flight results were compared with results from constant -altitude flybys, wind-tunnel studies, and theoretical prediction data. It was found that the constantangle-of-attack technique provided data that were consistent with data obtained from constant-altitude flybys and required fewer runs to obtain the same amount of data. The test results from an F5D-1 airplane modified with an ogee wing, a prototype F5D-1 airplane, two XB-70 airplanes, and an F-104A airplane indicate that theory and wind-tunnel results adequately predict the trends caused by ground effect as a function of height and aspect ratio. However, the magnitude of these predictions did not always agree with the flightmeasured results. In addition, there was consistent evidence that the aircraft encountered ground effect at a height above one wing span.

Author : Carlos Guedes Soares,T.A. Santos
Publisher : CRC Press
Page : 1226 pages
File Size : 48,7 Mb
Release : 2016-12-01
Category : Technology & Engineering
ISBN : 9781498795937

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Maritime Technology and Engineering III by Carlos Guedes Soares,T.A. Santos Pdf

Maritime Technology and Engineering 3 is a collection of papers presented at the 3rd International Conference on Maritime Technology and Engineering (MARTECH 2016, Lisbon, Portugal, 4-6 July 2016). The MARTECH Conferences series evolved from biannual national conferences in Portugal, thus reflecting the internationalization of the maritime sector. The keynote lectures and the papers, making up nearly 150 contributions, came from an international group of authors focused on different subjects in a variety of fields: Maritime Transportation, Energy Efficiency, Ships in Ports, Ship Hydrodynamics, Ship Structures, Ship Design, Ship Machinery, Shipyard Technology, afety & Reliability, Fisheries, Oil & Gas, Marine Environment, Renewable Energy and Coastal Structures. This book will appeal to academics, engineers and professionals interested or involved in these fields.

Author : Liang Yun,Alan Bliault,Johnny Doo
Publisher : Springer Science & Business Media
Page : 459 pages
File Size : 41,6 Mb
Release : 2009-12-03
Category : Technology & Engineering
ISBN : 9781441900425

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WIG Craft and Ekranoplan by Liang Yun,Alan Bliault,Johnny Doo Pdf

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 : Chin-Hsing Kuo,Pei-Chun Lin,Terence Essomba,Guan-Chen Chen
Publisher : Springer Nature
Page : 521 pages
File Size : 54,9 Mb
Release : 2019-09-26
Category : Technology & Engineering
ISBN : 9783030300364

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Robotics and Mechatronics by Chin-Hsing Kuo,Pei-Chun Lin,Terence Essomba,Guan-Chen Chen Pdf

This book gathers the latest advances, innovations and applications in the field of robotics and mechatronics, as presented by leading international researchers and engineers at the 6th IFToMM International Symposium on Robotics and Mechatronics (ISRM), held in Taipei, Taiwan, on October 28–30, 2019. It covers highly diverse topics, including mechanism synthesis, analysis, and design, kinematics and dynamics of multibody systems, modelling and simulation, sensors and actuators, novel robotic systems, industrial- and service-related robotics and mechatronics, medical robotics, and historical developments in robotics and mechatronics. The contributions, which were selected through a rigorous international peer-review process, share exciting ideas that spur novel research directions and foster new, multidisciplinary collaborations.

Author : Vernard E. Lockwood
Publisher : Unknown
Page : 28 pages
File Size : 48,5 Mb
Release : 1961
Category : Wind tunnels
ISBN : UIUC:30112106915090

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Effect of Groundboard Height on the Aerodynamic Characteristics of a Lifting Circular Cylinder Using Tangential Blowing from Surface Slots for Lift Generation by Vernard E. Lockwood Pdf

Lift and drag measurements were obtained on a semispan circular cylinder having a lengthdiameter ratio of 4 (aspect ratio 8) and an end plate of 2.5 diameters. The investigation was made to determine to what extent the characteristics are affected by groundboard height. Tests were made over a momentum coefficient range from 0.14 to 4.6 and groundboard height ranging from 1.5 to 10 diameters from the cylin er axis. The test Reynolds number was approximately 290,000. (Author).

Author : Richard E. Kuhn,Richard J. Margason,Peter Curtis
Publisher : AIAA (American Institute of Aeronautics & Astronautics)
Page : 226 pages
File Size : 54,8 Mb
Release : 2006
Category : Technology & Engineering
ISBN : UOM:39015064807350

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Jet-induced Effects by Richard E. Kuhn,Richard J. Margason,Peter Curtis Pdf

The unique characteristics of V/STOL flight bring with it unique aerodynamic challenges. Intended for the working professional or those in engineering graduate programs involved with V/STOL, this book provides information on the aerodynamic effects induced by the exiting flows of jet and fan powered V/STOL aircraft in hover and transition flight.

Author : Wolf-Heinrich Hucho
Publisher : Elsevier
Page : 577 pages
File Size : 55,5 Mb
Release : 2013-10-22
Category : Technology & Engineering
ISBN : 9781483102078

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Aerodynamics of Road Vehicles by Wolf-Heinrich Hucho Pdf

Aerodynamics of Road Vehicles details the aerodynamics of passenger cars, commercial vehicles, sports cars, and race cars; their external flow field; as well as their internal flow field. The book, after giving an introduction to automobile aerodynamics and some fundamentals of fluid mechanics, covers topics such as the performance and aerodynamics of different kinds of vehicles, as well as test techniques for their aerodynamics. The book also covers other concepts related to automobiles such as cooling systems and ventilations for vehicles. The text is recommended for mechanical engineers and phycisists in the automobile industry who would like to understand more about aerodynamics of motor vehicles and its importance on the field of road safety and automobile production.

Author : Kenneth W. Goodson,James H. Otis
Publisher : Unknown
Page : 52 pages
File Size : 42,6 Mb
Release : 1961
Category : Aerodynamics
ISBN : UIUC:30112106682476

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Effect of Ratio of Jet Area to Total Area and of Pressure on Lift Augmentation of Annular Jets in Ground Effect Under Static Conditions by Kenneth W. Goodson,James H. Otis Pdf

Author : James H. Kamman,Charles L. Hall
Publisher : Unknown
Page : 780 pages
File Size : 51,6 Mb
Release : 1978
Category : Short take-off and landing aircraft
ISBN : UOM:39015095339969

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Lift System Induced Aerodynamics of V/STOL Aircrtaft in a Moving Deck Environment by James H. Kamman,Charles L. Hall Pdf

The propulsive lift system induced aerodynamics of multi-jet VSTOL aircraft configurations were experimentally evaluated over a moving deck and at static hover conditions. Several model configurations representative of advanced subsonic and supersonic VSTOL aircraft were tested. Dynamic jet-induced force and moment data were obtained for heaving, pitching, and rolling motions of a simulated seaborne landing platform over a range of heights, amplitudes, and frequencies. Configuration effects were assessed at both static hover and deck motion conditions, including the effects of wing height, fuselage contouring, lift improvement devices, and nozzle arrangement. In addition, tests were performed to separate the effects of deck motion on the fountain impingement forces. Empirical procedures were defined to aid in predicting the dynamic jet- induced forces and moment variations with deck motion. Configuration design and model testing guidelines for VSTOL aircraft are described. Recommendations are also made for further research to provide additional information required to develop generalized prediction procedures.

Author : Harry H. Heyson
Publisher : Unknown
Page : 18 pages
File Size : 54,6 Mb
Release : 1960
Category : Ground-cushion phenomenon
ISBN : UIUC:30112106589309

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Ground Effect for Lifting Rotors in Forward Flight by Harry H. Heyson Pdf

Author : Danny R. Hoad,Garl L. Gentry
Publisher : Unknown
Page : 156 pages
File Size : 54,8 Mb
Release : 1977
Category : Transport planes
ISBN : UIUC:30112106723767

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Longitudinal Aerodynamic Characteristics of a Low-wing Lift-fan Transport Including Hover Characteristics in and Out of Ground Effect by Danny R. Hoad,Garl L. Gentry Pdf

Author : Anonim
Publisher : Unknown
Page : 436 pages
File Size : 43,8 Mb
Release : 1997
Category : Marine engineering
ISBN : UOM:39015047410074

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Transactions by Anonim Pdf

Author : Holt Ashley,Mårten Landahl,Marten T. Landahl
Publisher : Courier Corporation
Page : 306 pages
File Size : 54,6 Mb
Release : 1965-01-01
Category : Technology & Engineering
ISBN : 9780486648996

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Aerodynamics of Wings and Bodies by Holt Ashley,Mårten Landahl,Marten T. Landahl Pdf

This excellent, innovative reference offers a wealth of useful information and a solid background in the fundamentals of aerodynamics. Fluid mechanics, constant density inviscid flow, singular perturbation problems, viscosity, thin-wing and slender body theories, drag minimalization, and other essentials are addressed in a lively, literate manner and accompanied by diagrams.