加齿型三向流道灌水器水力性能及抗堵性能研究OA

The purpose of this study is to explore the influence mechanism of adding a unique inner tooth structure in the flow channel of the three-way flow channel emitter on its performance,so as to optimize the performance of the emitter and improve its performance in practical applications.Methods Using the combination of numerical simulation and physical experiments,the flow field distribution,hydraulic performance and anti-clogging performance of the three-way flow channel were systematically studied by setting different internal tooth structure parameters.Results On the one hand,the inner tooth structure changed the flow path,which reduced the area of low-speed zone and expanded the range of high-speed zone in the branch channel.When the width of tooth a was 0.3 mm and the width of tooth b was 3 mm,the flow index reached the minimum value of 0.468 9,and the flow coefficient and flow index showed a downward trend after adding inner teeth.On the other hand,the anti-clogging performance test shows that the relative discharge showed a fluctuating declining trend but remained above 75%,and the sediment is mainly deposited at the front end of the branch channel.The 10 th irrigation test shows that the inner tooth structure has a negative impact on the anti-clogging performance.The CFD two-phase flow simulation shows that the trajectory of sediment particles is similar,and the vortex is concentrated at the front end of the flow splitter.Conclusion The addition of inner tooth structure can significantly improve the hydraulic performance of the three-way flow channel and optimize the flow field distribution,but it will reduce the anti-clogging performance of the three-way flow channel to a certain extent.This conclusion can provide an important reference for the design improvement of the three-way channel emitter.On this basis,the shape or size of the inner tooth structure can be further optimized to improve the anti-clogging performance while improving the hydraulic performance.