Pneumatic actuators with "bouncing" air-jet - part 1: Numerical solutions

• Autorzy: Tesar V. , Peszyński K.
• Języki publikacji: EN

Abstrakty

EN

An actuator generating a force action on a small body by an issuing air jet is based on the unusual, little known and seemingly impossible mechanism of the jet "reflecting" or "bouncing back" from an impact on a solid wall. Under usual conditions the bouncing back from the wall is not possible - the trick is the wall is provided with perforations that allow a part of the jet to pass through. On doing so it has to change its direction and this has to be compensated by the remaining part changing its direction too, into the opposite side as seen from the jet axis. This part forms the "reflected" jet. The phenomenon is investigated by flow visualisation and detailed flowfield computations presented in this paper - the first part of which discusses the computed results.

Słowa kluczowe

EN

jet; momentum balance; impinging jet; flow visualisation

PL

bilans pędu; wizualizacja przepływu

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2010
• Tom: Vol. 15, no 3
• Strony: 855--865
• Opis fizyczny: Bibliogr. 8 poz., rys., wykr.

Twórcy

autor

Tesar V.

autor

Peszyński K.

• Institute of Thermomechanics Academy of Sciences of the Czech Republic Dolejškova 1402/5, 182 00 Praha 8 Prague, CZECH REPUBLIC,

Bibliografia

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• Tesař V. (1990): “Reflection” of a fluid jet from a (perforated) wall: A flow visualization study. – Flow Visualization V, editor R. Řezníček, Hemisphere Publ. Co., New York, ISSN 0-89116-887-7.
• Tesař V. (1994): Aerodynamic investigations of the weaving reed. – Proc. of WORKSHOP ČVUT 94, Part A, section Fluid Mechanics, Prague, Czech Republic, pp.167.
• Tesař V. (1995): Two-equation turbulence model solution of the plane turbulent jet. – Acta Polytechnica, vol.35, No.2, pp 19.
• Tesař V. (2001): Reynolds-number dependent flow turning by a fixed cascade. – Proc. of RECURKULACJA-Proc. of XI. International Conference, ISSN 0137-9682, Bydgoszcz, Poland, pp.265.
• Tesař V (2009) Odraz proudu od paprsku (Jet Bouncing from Weaving Reed. – in Czech), Conf. Topical Problems of Fluid Mechanics, Prague, Czech Republic, Institute of Thermomechanics AS ČR, v. v. i. (editors: Příhoda, J.; Kozel, K.) pp.103-106. ISBN 978-80-87012-19-2.
• Tollmien W. (1926): Berechnung Turbulenter Ausbreitungsvorgänge. – Zetschrift für Angewandte Mathematik und Mechanik, pp.68, Bd.6, Berlin, Germany.