Abstract
Complete description of all forces acting on a flying Beach Volleyball was made based on measurements in the wind tunnel. Forces (drag, lift and side force) were measured for different angle of attack β which varies from 0° to 47°. Velocity region was from 10 to 25 m/s and revolution region was from 0 to 12.5 rps. Moments (Roll, Yaw, Pitch) were detected. Results are described by means of non-dimensional numbers, such as Reynolds number Re, spin s, drag CD, lift CL and side force CS coefficients. Differences in results of CD, CL and CS were detected for various angle β and are further described in the article. Conclusions of the investigation can be utilized 1st by ball producers for practical use in development, 2nd for sport Methodist to build more exact methodology for Beach Volleyball, 3rd in basic and applied aerodynamic research.
Highlights
Forces acting on rotating sport ball which is in the wind tunnel test section are three, drag force FD, lift force FL and side force FS
Free observation of rotating spheres, which are thrown into water is one approach [1], second describes trajectory of flight of a volleyball in real conditions [4] and others [3] measured forces acting on the volleyball fixed in a special stand in an aerodynamic wind tunnel test section
Based on the principels described in Discussion, main conclusion is made: 1. detailed results study will be made, 2. measurement uncertainties must be counted and described, 3. moments coefficients will be counted and results will be described, 4. aerodynamic characteristic CL vs. CD will be described
Summary
Forces acting on rotating sport ball (as well as any other body in flow) which is in the wind tunnel test section are three, drag force FD, lift force FL and side force FS. Experimental data of forces acting on the flying rotating sphere were measured in different studies and were published in articles [1], [2], [3], [4], [5] and others. Free observation of rotating spheres, which are thrown into water is one approach [1], second describes trajectory of flight of a volleyball in real conditions [4] and others [3] measured forces acting on the volleyball fixed in a special stand in an aerodynamic wind tunnel test section. Wind tunnel measurements can describe with forces acting (forces and moments) on a rotating sphere, a right set-up is required
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