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| Analysis of working mechanism and hydraulic performance of two-way flow channel stabilizer in bubbler irrigation emitter |
| GUO Lin, BAI Dan, WANG Xinduan, HE Jing |
| Faculty of Water Resources and Hydroelectric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
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Abstract In order to study on the hydraulic performance of the structure of two-way flow channel stabilizer in bubbler irrigation emitter, the inner structure of the stabilizer is modelled with three geometrical parameters, namely the angle α between the two splayed baffles, the angle β of V-shaped baffle, and the throat width d of the two splayed baffles. The experimental models have been designed by changing those parameters. The experimental models are manufactured by laser engraving technology, and the flow rates are measured under nine pressures ranged in 0.05-0.21 MPa. The experimental results are fitted by multivariable regression method, showing the models are subject to an excellent hydraulic performance with a flow regime index in 0.476 to 0.501. Meanwhile, the minor hydraulic loss coefficients across the models are calculated. The coefficients are between 18.3 to 19.8, nearly 4-10 times the minor loss coefficients across a traditional flow channel when the operating head is ranged in 5 to 15m, suggesting the designed stabilizers show an excellent energy dissipation behavior. Mathematical relationships between flow regime index and geometrical parameters are developed by using multivariable regression method with Gauss-Newton algorithm based on Minitab software in which the number of iterations is set to be 200. The results show that the regression is significant in statistics in both Significance test and correlation coefficient test. The relationships provide a theoretical basis for parameterized design, structure optimization, development and application in agricultural engineering.
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Received: 22 September 2015
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