Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Aerodynamic Experimental Tests of Forces and Torques Acting on the Volleybal
J. Dumek, P. Šafařík
Abstract:
Measurements of forces acting on a flying volleyball were done. One conclusion, which was made is, that rotation n = 8.75 rps is the breaking point in the course of the lift coefficient CL vs. revolutions n. In the measurements were used just 4 dynamometers, 2 for lift force FL and 2 for drag FD. In first part of measuring it is not considered, that any influence of torque is acting on the volleyball. Non dimensional numbers – Reynolds number Re, spin s, drag CD and lift CL coefficient are described in the article. A proposal of a new experimental set-up has been prepared. All three forces and three torque components will be observed, resulting in a whole description of force effects acting on volleyball.
Keywords:
aerodynamics, forces, measurements, torque, volleyball

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2017.015

In Proceedings Topical Problems of Fluid Mechanics 2017, Prague, 2017 Edited by David Šimurda and Tomáš Bodnár, pp. 113-116 ISBN 978-80-87012-61-1 (Print) ISSN 2336-5781 (Print)