Comparing selected parameters of a two-dimensional turbulent free jet on the basis of experimental results, digital simulations, and theoretical analyses
Aldona Skotnicka-Siepsiak
Abstract
The presented experimental and digital examinations of a two-dimensional turbulent free jet are a first phase of in the study of the Coandă effect and its hysteresis. Additionally, basing on theoretical analyses, selected results for a turbulent jest have been also mentioned, considering theoretical assumptions for the wall layer. As the result, on the basis of experimental, digital, and analytical methods, a review of characteristic jet properties has been prepared, which includes a jet spreading ratio, its cross and longitudinal sections, and turbulence level. The jet spreading radio has been expressed as a non-linear function of the x : b relative length.
Keywords:
2D free jet, turbulent jet, CFD, spreading rate, velocity profiles, Coanda effectReferences
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COANDA H. 1936. Device for deflecting a stream of elastic fluid projected into an elastic fluid. United States Patent 2052869. http://www.freepatentsonline.com/2052869.html (access: 09.12.2016).
COANDA H. 1938. Propelling device. United States Patent 2108652. http://www.freepatentsonline.com/2108652.html (acess: 09.12.2016).
FAGHANI E., ROGAK S.N. 2012. Application of CFD and Phenomenological Models in Studying Interaction of Two Turbulent Plane Jets. International Journal of Mechanical Engineering and Mechatronics, 1(1).
FÖRTHMANN E. 1934. Über turbulente Strahlausbreitung. Ing.-Archiv, 5(42).
GÖRTLER H. 1942. Berechnung von Aufgaben der freien Turbulenz auf Grund eines neuen Naeherungsatzes. ZAMM, 22: 244.
HAQUE E., HOSSAIN S., ASSAD-UZ-ZAMAN M., MASHUD M. 2015. Design and construction of an unmanned aerial vehicle based on Coanda effect. Proceedings of the International Conference on Mechanical Engineering and Renewable Energy (ICMERE2015), 26–29 November, Chittagong, Bangladesh.
HOOFF T. VAN, BLOCKEN B., DEFRAEYE T., CARMELIET J., VAN HEIJST G.J.F. 2012. PIV measurements and analysis of transitional flow in a reduced-scale model: Ventilation by a free plane jet with Coanda effect. Building and Environment, 56: 301-313.
KOTSOVINOS N.E. 1976. A Note on the Spreading Rate and Virtual Origin of a Plane Jet. The Journal of Fluid Mechanics, 77(2): 305-311.
MIRKOV N., RASUO B. 2012. Manoeuvrability of an UAV with Coanda effect based lift production. 28th International Congress of the Aeronautical Sciences.
MIRKOV N., RASUO B. 2012. Numerical simulation of air jet attachment to convex walls and applications. 28th International Congress of the Aeronautical Sciences.
NEWMAN B.G. 1961. The Deflexion of Plane Jet by Adjacent Boundaries - Coandă Effect. Pergamon Press, Oxford.
RAJARATNAM N. 1976. Turbulent Jets. Elsevier Scientific Publishing Company, Amsterdam - Oxford - New York.
RECKNAGEL H., SPRINGER E., HÖNMANN W., SCHRAMEK E.R. 1994. Poradnik ogrzewanie i klimatyzacja. EWFE, Gdańsk.
REICHARDT H. 1943. On a New Theory of Free Turbulence. J. Roy. Aero. Soc., 47: 167.
SZYMAŃSKI T., WASILUK W. 1999. Wentylacja użytkowa poradnik. IPPU Masta, Gdańsk.
VALENTÍN D., GUARDO A., EGUSQUIZA E., VALERO C., ALAVEDRA P. Use of Coanda nozzles for double glazed facades forced ventilation. Energy and Buildings, 62: 605-614.
WIERCIŃSKI Z., GROMOW E. 2002. Polepszenie rozdziału powietrza w pomieszczeniu wentylowanym za pomocą niestacjonarnego efektu Coandă. Ciepłownictwo Ogrzewnictwo Wentylacja, 10.
Skotnicka-Siepsiak, A. (2016). Comparing selected parameters of a two-dimensional turbulent free jet on the basis of experimental results, digital simulations, and theoretical analyses. Technical Sciences, 20(1), 31–48. https://doi.org/10.31648/ts.2907
Aldona Skotnicka-Siepsiak
