Numerical Simulation of the Influence of Inner Tooth Position on the Hydraulic Characteristics of Bidirectional Flow Channel Emitter
One or two inner teeth were added to the bidirectional flow channel emitter to form four kinds of single inner tooth bidirectional flow channel emitters with different relative positions of inner teeth and four kinds of double inner tooth bidirectional flow channel emitters with dif-ferent relative positions of inner teeth, so as to explore the advantages and disadvantages of the hydraulic performance of the bidirectional flow channel emitters before and after the addition of inner teeth.For each emitter, the three-dimensional modeling of the flow channel of the emit-ter was carried out by AutoCAD, and the flow state of the fluid inside the flow channel was simulated by Ansys Fluent.The local loss coeffi-cient of the flow channel was calculated, and the flow coefficient and flow index were obtained by regression analysis.The results show that the local loss coefficient of the improved bidirectional flow channel is 11.24-56.89, which is significantly higher than that of the original bidirec-tional flow channel.The flow coefficient of the improved bidirectional flow channel is smaller than that of the original bidirectional flow chan-nel.When the single inner tooth is located at the inlet of the branch channel, the flow index is the best, which is 5.6％ lower than that of the original bidirectional flow channel.The position of the inner tooth can affect the bidirectional flow ratio, which in turn affects the hydraulic per-formance, and verifies the internal relationship between the different flow ratios of the main and branch channels and the hydraulic perform-ance.The research can provide reference for the structural optimization and hydraulic performance improvement of the bidirectional flow chan-nel emitter.
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