Theoretical and Experimental Study on Water Offset Flow in Fluidic Component of Fluidic Sprinklers
Publication: Journal of Irrigation and Drainage Engineering
Volume 137, Issue 4
Abstract
Compared with other rotating sprinklers, the fluidic sprinkler controlled by an outlet clearance has a simpler structure and better hydraulic performance. The offset effect, happening in the fluidic component of the sprinkler, drives the sprinkler and controls its rotational direction. Theoretical and experimental research are conducted to study the water offset jets with a small ratio of 0.675 for the 10PXH sprinkler and 0.355 for the 30PXH sprinkler in the fluidic components. Analytic solutions and other calculations deduce the reattachment lengths of the offset jets. Computational fluid dynamics (CFD) software simulates the offset flows in simplified models and real models of the fluidic components, in two dimensions and three dimensions, respectively, utilizing the volume of fluid (VOF) method to trace the shape of the interface between water and gas. Simulation results of the sidewall pressure distribution also obtain the reattachment lengths. The resulting experimental measurements of the static pressure and reattachment length are in line with the predicted results of the calculations and the simulations. These results indicate that CFD simulation can approximate the offset flow in fluidic components. On the basis of this study, some of the component sizes are confirmed.
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Acknowledgments
Part of this research was supported by National High-Tech Project in China (UNSPECIFIED2006AA100211) and part by Jiangsu Natural Scientific Foundation in China (UNSPECIFIEDBK2007089).
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Published In
Journal of Irrigation and Drainage Engineering
Volume 137 • Issue 4 • April 2011
Pages: 234 - 243
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 25, 2009
Accepted: Aug 26, 2010
Published online: Aug 31, 2010
Published in print: Apr 1, 2011
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