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| Influence of structural parameters of improved bidirectional flow channel on hydraulic performance in drip irrigation |
| WANG Xinduan, BAI Dan, GUO Lin, HE Jing |
| Institute of Water Resources and Hydroelectric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
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Abstract The size of the existing bidirectional flow channel was so large that it was difficult to produce in current drip irrigation production facility. In order to solve this problem, the structure of flow channel was redesigned by means of changing the placing ways of dividing water and the blocking water objects and reducing the size of structure parameters. To the new flow channel, 16 hydraulic tests were carried out with the orthogonal design method to research the effects of 4 key structure parameters on hydraulic performance. The results obtained from range analysis and variance analysis show that the width of flow path is the most important factor affecting the flow index, and the flow coefficient is seriously influenced by the distance between dividing water object and flow channel boundary. Then two models about flow index and flow coefficient to 4 key structure parameters are established according to the multiple linear regression method. It has been verified that the two models are able to express the relationship between the 4 key structure parameters and the hydrodynamic behaviors. These conclusions can offer guidance for the structural optimization of bidirectional flow channel and making the hydraulic performance of the new channel better.
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Received: 13 January 2016
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