Anti-clogging design method for emitter used for eliminating suspended particle aggregation position in runner

Abstract

The invention discloses an anti-clogging design method for an emitter used for eliminating the suspended particle aggregation position in a runner, which comprises the following steps: constructing a geometrical structure model of the internal runner of the drip irrigation emitter, and determining the boundary conditions of an inlet and an outlet of the runner; adopting a computational fluid dynamics (CFD) solid-liquid two-phase flow model to carry out the numerical simulation on the runner model according to the boundary conditions; extracting the cross section with the percentage of the content of suspended particles in the runner, and modifying the runner model according to the minimum concentration curve of the suspended particles; and repeating the steps, and filtering out the runnershape with the maximum concentration of the suspended particles which is nearest to the concentration of the suspended particles at the inlet. The anti-clogging design method firstly takes into full consideration of the hydraulic performance, the anti-clogging performance and the runner processing of the drip irrigation emitter and can form the better runner structural form.

Description

technical field [0001] The invention relates to an agricultural drip irrigation technology, in particular to an anti-clogging design method of an emitter for removing the accumulation position of suspended particles in a flow channel. Background technique [0002] The drip irrigation emitter is one of the most important components in the drip irrigation system. The drip irrigation emitter is called the heart of the drip irrigation system. Its function is to make the pressurized water flow through its internal narrow and long channel structure or micropores to fully dissipate energy to The water stream drips steadily and evenly into the soil. Its hydraulic performance and anti-clogging performance are the decisive factors for the investment, operating cost and service life of the drip irrigation system. The quality of the drip irrigation emitter directly affects the operational reliability, cost and service life of the entire drip irrigation system. The clogging of drip irri...

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Problems solved by technology

In addition, some scholars have used solid-liquid two-phase flow simulation to eliminate the area where particles are easy to gather in the flow channel of the drip irrigation emitter, but still modify the flow channel based on the streamline of the water flow and the flow of the entire flow field. This method It can improve the anti-clogging ability but changes the original hydraulic performance of the emitter, and needs to increase the length of the flow channel to make up for the lack of energy dissipation

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