Wyniki wyszukiwania - BazTech

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Water tunnel visualisation and numerical analysis of flow around TS-11 Iskra wing with flow control surfaces

Szczepaniak R., Walusiak S., Bąbel R., Mazurek Ł, Stryczniewicz W., Kowaleczko G.

Journal of KONES

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2017

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Vol. 24, No. 2

253--261

EN

The article presents investigation of flow around wing of TS-11 Iskra airplane. The flow visualization around 3D printed model of wing with flow control surfaces was performed in a water tunnel. Two configurations were investigated: first with a flap and second with an aileron. The flow visualisation was performed with a use of a dye. The geometry of model was prepared with use Computer Aided Design (CAD) software basing on scans of real object and technical documentation. The model was built with use of additive manufacturing technology. Movement of the flow control surfaces was remotely controlled with servomechanisms incorporated in channels inside the model. In order to perform qualitative validation of the results the investigated flow was simulated with use of CFD commercial software. The article presents visualisation results of flow around wing section of TS-11 Iskra airplane and water tunnel model preparation. In order to perform qualitative validation of the results the investigated flow was simulated with use of CFD commercial software. The goal of the research was to investigate the complex flow field in the vicinity of flow control surfaces and provide aerodynamic characteristics at various deployment angles via numerical simulations. The results can be used for verification of water tunnel testing procedures and training.

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CFD analysis of the influence of flaps extension on the aerodynamic characteristics of the M-28 Bryza aircraft

Szczepaniak R., Konopka B., Zahorski T., Bąbel R., Stryczniewicz W.

Journal of KONES

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2016

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Vol. 23, No. 1

353--360

EN

The paper presents a modelling procedure of the M-28 Bryza wing with extended flaps and Computational Fluid Dynamics (CFD) simulations results preformed in order to assess the performance of the investigated wing for various flap extension rates. The M-28 Bryza is a two-engine high-wing aircraft used in the Polish Air Force for short distance airlift of people and equipment. The aim of this work was to determine the aerodynamic characteristics of the investigated wing. The CFD simulations were performed in order to investigate the influence of flap extension on lift and drag coefficients at various angles of attack. In order to validate the results of two different commercial CFD packages were used. The findings are presented in the form of flow visualization and aerodynamic characteristics. The typical and non-standard extension rates were investigated for low, moderate and high angles of attack. The results correlated with the limitations specified in the aircraft manual. The outcome of the presented work confirmed the feasibility of the presented methodology for its use as a supportive tool for providing additional information about airplane performance in standard and non-standard conditions of flight such as landing with one engine working. The results of work might prove useful for M-28 Bryza pilots and maintenance personnel as well as for educational purposes.

3

Numerical analysis of aerodynamic characteristics of a of high-speed car with movable bodywork elements

Janson T., Piechna J.

Archive of Mechanical Engineering

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2015

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Vol. LXII, nr 4

451--476

EN

This paper presents the results of numerical analysis of aerodynamic characteristics of a sports car equipped with movable aerodynamic elements. The effects of size, shape, position, angle of inclination of the moving flaps on the aerodynamic downforce and aerodynamic drag forces acting on the vehicle were investigated. The calculations were performed with the help of the ANSYS-Fluent CFD software. The transient flow of incompressible fluid around the car body with moving flaps, with modeled turbulence (model Spalart-Allmaras or SAS), was simulated. The paper presents examples of effective flap configuration, and the example of configuration which does not generate aerodynamic downforce. One compares the change in the forces generated at different angles of flap opening, pressure distribution, and visualization of streamlines around the body. There are shown the physical reasons for the observed abnormal characteristics of some flap configurations. The results of calculations are presented in the form of pressure contours, pathlines, and force changes in the function of the angle of flap rotation. There is also presented estimated practical suitability of particular flap configurations for controlling the high-speed car stability and performance.

PL

W pracy przedstawiono wyniki numerycznej analizy charakterystyk aerodynamicznych szybkiego samochodu wyposażonego w ruchome elementy aerodynamiczne – klapy. Badano wpływ wielkości, kształtu, położenia, kąta nachylenia ruchomych klap, na docisk aerodynamiczny pojazdu i siły oporu aerodynamicznego. Obliczenia wykonano za pomocą oprogramowania CFD ANSYS-Fluent. Analizowano nieustalony przepływ płynu nieściśliwego z modelowanym wpływem turbulencji (model Spalarta-Allmarasa lub SAS), wokół nadwozia, podczas ruchu klapy. Wyniki obliczeń przedstawiono w postaci rozkładów ciśnienia, przebiegu linii prądu, zmian sił w funkcji kąta obrotu klapy. Analizowano zarówno wielkości sił aerodynamicznych powstających na nadwoziu z klapami jak i przyczyny ich powstawania. Pokazano przykłady skutecznych konfiguracji klap jak i przykłady konfiguracji nie generujących aerodynamicznej siły docisku. Przedstawiono porównanie zmian sił występujących przy różnych kątach otwarcia klap, rozkłady ciśnień, wizualizacje przepływu wokół nadwozia. Przedstawiono fizyczne przyczyny obserwowanych nietypowych charakterystyk działania klap. Oszacowano praktyczną przydatność poszczególnych rozwiązań do kontroli stabilności szybkiego samochodu.