Temat: ground effect - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Flaps influence on wing in ground effect lift coefficient
Autorzy:: Rojewski, A.
Bartoszewicz, J.
Tematy:: transport
ground effect vehicle
numerical analysis
wing in ground effect
flaps; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242337.pdf Link otwiera się w nowym oknie
Opis:: The main purpose of this article was to study flaps application influence on airfoil, which flies in the wing in ground effect with lift, and drag coefficients changes. Wing in ground effect occurs in the direct proximity of ground, it makes lift coefficient higher than in free stream flight, also decreases drag coefficient. WIG effect craft can be an alternative for traditional aircraft, but also for marine transportation. The article presents wing in ground effect creation mechanism description with height coefficient explanation, also presents experimental analysis of lift coefficient with reference to height coefficient. Airfoil with flaps simulation and for free stream flight. Application of flaps makes the wing in ground effect more efficient by lift coefficient rise, what provides also to drag coefficient rise. Flaps provide to absolute pressure rise under the airfoil. It allows to fly slower without lift force change or to make aircraft start shorter without risk of stall. The article shows also conditions and results of Ansys Fluent software simulation for NACA M8 airfoil for angles of attack equal to: 0°, 6°, 10° for three different cases: free stream flight, wing in ground flight with the clear wing, wing in ground flight with flaps, and conditions of analysis convergence.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A study on performance of planing-wing hybrid craft
Autorzy:: Zeraatgar, Hamid
Rostami, Ali Bakhshandeh
Nazari, Abolfazl
Tematy:: hydrodynamics
ground effect
wing
planing
aerodynamics
VLM; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259870.pdf Link otwiera się w nowym oknie
Opis:: A hybrid craft is defined as a combination of different lifting surfaces. The lift force can be of aerodynamic or hydrodynamic character. This research deals with the conditions of using planing mono-hulls equipped with a couple of wings, called planing-wing hybrid craft. A parametric study is conducted by using Vortex Lattice Method to determine feasibility of using an aerodynamic wing mounted to planing craft. It has been determined that the wing area should be more than twice as much as the wetted surface of the craft, to get an effective wing for planing craft. Furthermore, the wing should be so designed as to obtain its high aspect ratio. Maximum lift force contribution resulting from different wing configurations considered in this study is less than 35 percent of the total hydrodynamic lift force at an arbitrary condition. On this basis it may be concluded that the wing may be effectively used only in special conditions, hence this is not recommended for general application.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical investigation of airfoil in ground proximity
Numeryczne badanie efektu przypowierzchniowego profilu aerodynamicznego
Autorzy:: Abramowski, T.
Tematy:: wing-in-ground effect
ekranoplan
numerical computations
fast transport; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281576.pdf Link otwiera się w nowym oknie
Opis:: The paper presents numerical investigation of the ground effect which affects an air flow when a craft's wing approaches the ground or sea surface. The effect has crucial significance for the wing-in-ground craft operation and decides about the purpose of building one at alI. The two-dimensional viscous flow problem is solved and the results of calculations are presented. Furthermore, some most important issues related to the basics of an ekranoplan application are very briefly discussed. On the basis of numerical calculations, an empirical formula has been proposed for quantitative assessment of the chord dominated ground effect.
Artykuł prezentuje wyniki badań numerycznych jednego z dwóch zjawisk zmieniających opływ skrzydła zbliżającego się do powierzchni gruntu lub morza. Efekt ten ma podstawowe znaczenie dla eksploatacji obiektu typu WIG, a przede wszystkim stanowi o sensie budowania takiej jednostki w ogóle. Uzyskano rozwiązanie dla przepływu dwuwymiarowego i zaprezentowano wyniki. Bardzo ogólnie zaprezentowano również podstawowe problemy związane z zastosowaniem ekranoplanu jako środka transportu. W oparciu o wyniki badań numerycznych zaproponowano wzór empiryczny do oceny ilościowej efektu przypowierzchniowego związanego ze zbliżaniem się profilu aerodynamicznego do powierzchni gruntu lub morza. Zależność tą można wykorzystać w praktyce, jeżeli tylko efekt związany z wirem wierzchołkowym skrzydła będzie miał pomijalny wpływ na cały efekt przypowierzchniowy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Airfoil selection for wing in ground effect craft
Autorzy:: Rojewski, A.
Bartoszewicz, J.
Tematy:: transport
ekranoplan
numerical analysis
wing in ground effect
airfoil; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245626.pdf Link otwiera się w nowym oknie
Opis:: The main purpose of this article was to select airfoil, which generates the biggest lift coefficient, with possibly smallest drag coefficient when the airfoil flies in the wing in ground effect. Wing in ground effect occurs in the direct proximity of ground, the article presents wing in ground effect creation mechanism description with automotive and aerospace examples. The article shows also wing in ground conditions of Ansys Fluent software simulation for all cases with conditions of analysis convergence. The article contains results of the numerical analysis for ten airfoils in three different positive angles of attack in the wing in ground flight; ten airfoils for free stream flight in the same angles of attack as in wing in ground effect, results contains lift and drag coefficients with NACA M8 airfoil presentation as authors choice for wing in ground effect crafts airfoil with full simulation results for angles of attack from –5° to 15°, with profile characteristics. The article shows physics of stall in the wing in ground effect, and a description why stall in WIG effect flight occurs only with drag coefficient rise without lift coefficient drop, and safety measures for aircraft landing with wing in ground effect influence.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical investigation of endplates influence on the wing in ground effect lift force
Autorzy:: Rojewski, Adam
Bartoszewicz, Jarosław
Tematy:: endplates
ekranoplan
numerical analysis
wing in ground effect
airfoil; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/950130.pdf Link otwiera się w nowym oknie
Opis:: The article presents a comparison of the wing in ground effect magnitude of conceptual WIG craft model main characteristics for a wing with and without endplates which are also known as winglets in regular aircraft. In article, the author describes WIG effect with and WIG craft, which operates on low altitude, smaller than the length of wing chord, mostly above the water reservoir. WIG effect phenomenon is simple. The first aircraft needs to fly at adequate altitude, with a smaller distance between lower airfoil surface and ground static pressure rises, leading to rising of lift force. The main advantage of the wing in ground effect craft on regular aircraft is a much higher lift to drag ratio, also this phenomenon provides to drop in specific fuel consumption of aircraft and allows flying with heavier cargo due to higher lift force. Characteristics present in the article were designated from simulations, which were conducted in Ansys Fluent software. Results obtained for a wing with endplate in numerical analysis shows the superiority of this approach. Endplates provide to increase WIG effect by a decrease in induced drag through the move out vertices from the wing tips, which are made by differential pressure above and under the wing. As winglets in regular aircraft, endplates provide to save fuel. WIG craft does not need airports so it could be a cheap alternative for modern aircraft.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Available search effort of the WIG craft
Wydajność poszukiwawcza ekranoplanu
Autorzy:: Górtowska, M.
Tematy:: ratownictwo morskie
patrolowanie
efekt przypowierzchniowy
maritime rescue
patrolling
ground effect; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/360171.pdf Link otwiera się w nowym oknie
Opis:: The article addresses an issue of expansion of maritime rescue systems with new components which are Wing-In-Ground-Effect Crafts (WIG craft). Due to operational characteristic, use of phenomenon of ground effect, WIG crafts are extremely economical and achieve relatively high speeds. In addition, they possess also amphibious features. This represents a huge potential for participation in search and rescue actions. The article discusses the phenomenon of a ground effect and its operation performance benefits and limitations. The applications of the WIG craft for specific actions such as conducting search, medical transport, supply of equipment and crews, patrolling are specified. The article analyzes the Search Effort of the WIG craft and marine search unit SAR-1500, actually used on Polish coast. The study consists in determining the relationship between the altitude of the observer, his speed and search width. Next the calculation of available search effort is conducted. The results enable to compare the ability of different types of the patrol units.
Artykuł porusza kwestię rozbudowy morskich systemów ratowniczych o nowe komponenty, jakim są ekranoplany (jednostki WIG). Ze względu na charakter operacyjny, czyli wykorzystywanie zjawiska efektu przypowierzchniowego, ekranoplany są niezwykle ekonomiczne oraz uzyskują relatywnie duże prędkości. Dodatkowo wyróżniają się cechami amfibijnymi. Stanowi to o ich ogromnym potencjale możliwości udziału w akcjach poszukiwawczo-ratowniczych. W artykule omówione zostaje zjawisko efektu przypowierzchniowego oraz wynikające z niego korzyści i ograniczenia eksploatacyjne. Wyszczególnione zostają także możliwości zastosowania ekranoplanu do konkretnych działań, takich jak prowadzenie poszukiwań, transport medyczny, dostarczanie sprzętu i ekip, patrolowanie etc. W artykule przeprowadzono analizę wydajności poszukiwawczej ekranoplanu oraz obecnie stosowanej na polskim wybrzeżu jednostki ratowniczej SAR-1500. Badanie polega na wyznaczeniu zależności między wysokością położenia obserwatora i jego prędkością a szerokością pasa poszukiwań oraz obliczeniu dostępnej wydajności poszukiwawczej. Wyniki analizy pozwalają na porównanie osiągów różnych typów jednostek patrolowych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Ground effect influence on the aerodynamic characteristics of ultralight high-wing aircraft : wind tunnel tests
Autorzy:: Placek, R.
Ruchała, P.
Stryczniewicz, W.
Tematy:: ground effect
aerodynamic characteristics
high-wing ultralight aircraft
wind tunnel research; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/241907.pdf Link otwiera się w nowym oknie
Opis:: The ground proximity may significantly improve the performance of the aircraft, but in some conditions, it affects its stability. The gain of lift which and reduction of drag during low altitude flight is known as the wing in ground effect (WIG effect). It may concern aircrafts or WIG-crafts (ground effect vehicles). In the article experimental results of the wind tunnel test of an aircraft in ground effect has been presented. The main aim of the test was to investigate the ground effect influence on aerodynamic characteristic of the of the ultralight high-wing aircraft model during early take off, taxiing or final landing stage. Investigation was carried out in the 1.5 m diameter low speed T-1 wind tunnel in the Institute of Aviation in Warsaw. The velocity was 32 m/s and Reynolds number related to the aerodynamic chord was equal about 0.37·106. Tests were performed for chosen angles of attack in range 0-10⁰. During investigation, the strain gauge balance measurements and Particle Image Velocimetry (PIV) flow visualization technique were applied. Tested model position was relatively close to the ground. It was found, that the ground proximity has significant influence on the pitching moment. The normal force was increased and the axial force is decreased due to the WIG effect, which is compatible with the theory. It has significant meaning for control aircraft issue and safety.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical Investigation of the Wing-in-Ground Effect on Aerodynamic Characteristics
Numeryczne badania wpływu efektu przypowierzchniowego na charakterystyki aerodynamiczne
Autorzy:: Wrzesień, S.
Frant, M.
Majcher, M.
Tematy:: mechanics
ground effect
aerodynamics
aerodynamic characteristics
efekt bliskości ziemi
aerodynamika
charakterystyki aerodynamiczne; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/403652.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the numerical evaluation of ground (proximity) effects on the basic aerodynamic characteristics of a specifically designed airplane model. The ground effects were investigated in relation to the angle of attack and flight altitude. The results were referenced to the characteristics of an object in motion unaffected by ground effects.
W pracy przedstawiono badania numeryczne wpływu efektu bliskości ziemi na podstawowe charakterystyki aerodynamiczne specjalnie do tego celu zaprojektowanej bryły samolotu. Zbadano wpływ bliskości ziemi w zależności od kąta natarcia oraz w zależności od wysokości lotu. Wyniki odniesiono do charakterystyk obiektu poruszającego się bez efektu bliskości ziemi.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Low altitude control for quadcopter using visual feedback
Autorzy:: Urbański, Konrad
Tematy:: control
estimation
ground effect
visual servoing
kontrola
szacowanie
efekt naziemny
serwomechanizm wizualny; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1955189.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of simulations and experiments in the field of control of the low damping and time delay oscillating system. This system includes a quadcopter hovering at a very low altitude, and the altitude is controlled. The time delay is introduced mainly by the remote control device. In order to handle the quadcopter at low altitudes, a proportional-integral controller with a negative proportional coefficient is used. Such an approach can provide good results in the case of an oscillating, low damped system. This method of steering, which uses a typical radio control transmitter, can be used on any commercially available leisure drone. Feedback is provided by a camera and algorithms of computer vision. The presented results were obtained experimentally using free flight–without a harness. Different types of controllers are used to control horizontal shift and altitude.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: 'Ground effect' Inter-Modal Fast Sea Transport
Autorzy:: Pagowski, Z. T.
Szafran, K.
Tematy:: Sea Transportation
Ground Effect
Intermodal Transport
Fast Sea Transport
Wing in Ground (WIG)
Airfoil Development (AFD)
Ekranoplane
WIG Aircraft; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/117126.pdf Link otwiera się w nowym oknie
Opis:: Energy and emission reduction strategies are extremely important in actual transport situation. “Ground effect” technology recognized from the late sixties has a problem with wide expanding in sea transport. It is connected with stability and control systems, aerodynamics of landing and take off also sea state of civil and military Ground Effect Craft named also WIGs ((Wing in Ground effect) or ekranoplanes Airfoil Development Gmbh (AFD) was certified in late 90-ies interesting design of ekranoplane “ Airfish 8” by Germanischer Llyod ( +100 A0 WIG – A , WH 0,5/1,5 EXP) like the fist civil ekranoplane. The Hoverwing 50 alias WST 500- has successful flown in Korea under AFD licence. Last developments in the aviation field indicates new role in maritime transport of WIG’s. Innovations in the fields of aviation improving the performances of WIGs in new future make possible to introduce this idea like "Ground effect" Inter-Modal Fast Sea Transport, which complement other modes of transport and flow of passengers also.
Dostawca treści:: Biblioteka Nauki

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