ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
To study the phenomenon of fluid-net-structure interaction of a trawl the authors investigatedeffects of hydro-elasticity of stiff net panels (grids) by means of special experiments in a windtunnel. The analyses were especially focused on how the grids affect the current.One of the targets was to observe the correlation between the actual distribution of velocity distantand close to the grid and the respective hydrodynamic load distribution namely under considerationof prevailing geometrical and kinematical parameters. Another aim of the tests was to get an idea ofthe fluid-dynamic interactions between neighbouring mesh bars which is implicitly expressed in thewell known nomographic diagram by Koritzky (1973).And last but not least the third target was to analyse the impact of the grid on the fluid parameters incorrelation with further investigations regarding the understanding of the phenomenon of selectivityof fishing gears.In context of these objectives the hydrodynamic loads as well as the current distributions close toand far from the grid surface were measured by a six-component balance, by hot-wire anemometersas well as by a 2d-PIV-system. The tests were focused on small angles of attack. To control themotion of fluid two end plates and a base plate were used. The consequences of a fluid blockage atthe end of a grid were analysed. Results are presented and discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.58.247.pdf
