| Based on the partition of hilly area and to the hilly irrigation, the large flow pressurecompensating emitter was developed. In order to measure the hydraulic performance of largeflow pressure compensating emitter and study the effect of different level of pressurecompensating area structural parameter and passageway on the hydraulic performance ofemitter, using of Pro/E three-dimensional to finish the three-dimensional printing, CFD tosimulate the hydraulic performance of the large flow emitter and laser processing machine tomake the body of large flow pressure compensating emitter to be measured. Based on thisway, two kinds of large flow pressure compensating emitter was developed, which werelarge flow pressure compensating emitter with passageway and large flow pressurecompensating emitter without passageway. At last, use the hydraulic trail and the short cyclean-clogging trail the test the hydraulic performance of these two kinds of large flow pressurecompensating emitters. According to the study, the thesis following can be gotten.(1) Two hilly areas was divided, the low area ranges within0-10m and the high arearanges10-40m. Different kinds of emitters were allocated to different altitude difference. Thepassageway emitter used commonly was allocated to the low altitude difference area and thelarge flow pressure compensating emitter was allocated to the high altitude difference area.(2) Aim at irrigating the mountain economy trees, develop two kinds of large flowpressure compensating emitters. These two kinds of emitter are made up of cavity, pressurecompensating-slice and foundation. These two kinds of emitters are large flow pressurecompensating emitter with passageway and large flow pressure compensating emitter withoutpassageway. For the large flow pressure compensating emitter with passageway, turn of theeffect on the x is: the thickness of the slice-the height of the foundation-the hardness of theslice and the turn of the effect on the flow is: the height of the foundation-the thickness of theslice-the hardness of the slice. The height of foundation can control the beginning of pressurecompensating range in a certain extent, so the suitable height of foundation can get a satisfypressure compensating range.(3) For the large flow pressure compensating emitter without passageway, the height offoundation and hardness of the slice have notable effect on the hydraulic performance emitter’s flow index and flow. According to this conclusion, the suitable flow index can begotten through controlling the height of foundation and hardness of the slice. The hardness ofslice and height also have remarkable effect on the pressure compensating range. Therelationship between pressure compensating structural parameter and hydraulic parameter isappreciable and simulated by SAS.(4) Passageway has ability of making water flow into turbulent flow, which can low thepressure of water. The combination of the passageway and pressure compensating structurecan give better hydraulic performance emitter. The main function of the passageway is to lowthe emitter flow, but the passageway has little effect on the pressure compensating range.(5) The capacity of anti-clogging of the large flow pressure compensating emitter is verygood by ISO international short cycle anti-clogging test.(6)According to the relationship between the hydraulic parameter of emitter and pressurecompensating structural parameter, taking the use of SAS software to simulate therelationship between the hydraulic parameter of emitter and pressure compensating structuralparameter and offer the theory reference for the development of the pressure compensatingemitter.(7)The best combination for large flow pressure compensating emitter with passagewayis the slice with a1.3mm of thickness and a50°in hardness and a4mm-height foundationand the best combination for large flow pressure compensating emitter without passageway isthe slice with a1.5mm of thickness and a50°in hardness and a2mm-height foundation.The hydraulic parameter of large flow pressure compensating emitter with passageway is0.055-flow index,5-40m pressure compensating range and13L/h average flow. The hydraulicparameter of large flow pressure compensating emitter without passageway is-0.055-flowindex,10-40m pressure compensating range and11L/h average flow. |
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