Effects of the Number of Inlet and Outlet Ports and Trapezoidal Channel Teeth on Anti-clogging Performance of a Single-wing Labyrinth Drip Irrigation Belt

Abstract

【Objective】 This paper is to study the effects of the number of water inlets, the number of teeth of the trapezoidal flow channel and the number of outlets on the anti-clogging performance of the single-wing labyrinth drip irrigation belt. We designed nine groups of working conditions for numerical simulation. 【Method】 Physical experiments, numerical simulations, linear mathematical models were used to study water and sand flow in a single-wing labyrinth drip irrigation belt when the flow rate was 1.8 L/h, as well as the influence of different inlet and outlet numbers and trapezoidal flow channel teeth on the flow index and flow coefficient of the drip irrigation belt. 【Result】 The SST k-ω two-equation for low Reynolds number turbulence model is more suitable for numerical simulation of flow field in the single-wing labyrinth drip irrigation belt. From the inlet to the trapezoidal channel and then to the outlet, the mass concentration of sediment particles gradually decreases; the fifth water inlet of drip irrigation belt is the main water inlet, and the third water outlet is the main water outlet; the number of water inlets, trapezoidal channel teeth, and the number of water outlets have a minimal impact on flow regime index; the their impact on the flow coefficient is ranked in the order of trapezoidal channel teeth>number of water outlets>number of water inlets; a multivariate linear model between the flow coefficient and the three factors was constructed, with a decision coefficient being 0.987. 【Conclusion】 When the size of the trapezoidal labyrinth flow path is the same, the smaller the number of teeth in the trapezoidal flow path was, the greater the internal flow velocity in the flow path would be. This facilitates discharge of sediment particles from the flow path. The constructed flow coefficient and three factor formula can achieve accurate irrigation at the outlet location, making reasonable use of land resources.

Keywords

• single-wing labyrinth drip irrigation belt
• sst k-ω turbulence model
• the two-phase flow of water and sand
• number of water inlets
• trapezoidal channel teeth
• number of water outlets