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Performance comparison of different aerodynamic shapes for autonomous underwater vehicles

Khalin Anatoliy, Kizilova Nataliya

Archive of Mechanical Engineering

2019

Vol. LXVI, nr 2

171--189

A brief review of the existing autonomous underwater vehicles, their types, design, movement abilities and missions is presented. It is shown, the shape optimization design and enhancement of their efficiency is the main problem for further development of multipurpose glider technologies. A comparative study of aerodynamic performance of three different shape designs (the airfoil NACA0022 based (I), flattened ellipsoidal (II) and cigar-type (III) bodies of the same volumes) has been carried out. Geometrical modelling, meshing and computational fluid dynamics (CFD) simulations have been carried out with AnSys15.0. The pathlines and wall shear stress distributions have been computed to understand the advantages and disadvantages of each shape. The lift and drag coefficients, aerodynamic quality, power index and pitching moment have been computed. The higher efficiency of the shape I/shape II at higher/lower angles of attack (greater than 20o and less than 20o) has been found. The shape III develops high speeds at the same angles of attack and has higher manoeuvrability at relatively low aerodynamic quality. The comparative analysis of the flow capabilities of studied autonomous undersea vehicles proposes some design improvement for increasing their energy efficiency and flow stability.

Algorytm obliczeń cech geometrycznych łopaty turbiny wiatrowej

Jureczko M., Mężyk A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2004

z. 25

69-74

Projektując turbinę wiatrową dąży się do uzyskiwania możliwie jak najwięcej mocy przy założonych warunkach atmosferycznych, m.in. prędkości wiatru. Z technicznego punktu widzenia wydajność aerodynamiczna turbiny wiatrowej zależy od kształtu łopaty. Dobór jej optymalnego kształtu jest głównym celem przeprowadzonych badań. Założono liczbę łopat turbiny wiatrowej, rodzaj profilu oraz warunki atmosferyczne. Obliczenia przeprowadzono wykorzystując Glauert Blade Element Theory.

The design of wind turbine consists of looking for a solution, in which wind turbine produces as much kWh for a year as possible, for chosen atmosphere conditions, i.e. wind velocity. On the other hand, from a technical point of view, the aerodynamic efficiency of wind turbine depends on shape of blade profile. Therefore the choice of optimal shape of wind turbine blade is the principal task of author's design, In order to conduct calculation authors assumed number of blades, type of aerofoil and atmosphere conditions. Calculations were performed on the basic Glauert Blade Element Theory.