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| Effect of elastic diaphragm characteristics on hydraulic performance of pressure-compensating emitter |
| WANG Yanbang1,2, LYU Chang1,2, DONG Aihong1,2, ZHANG Wenqian1,2, ZHANG Erxin1,2, NIU Wenquan1,3* |
| 1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China |
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Abstract In order to determine the relationship between the performance of the elastic diaphragm and the hydraulic performance of the emitter, and promote the establishment of the scientific design method of the pressure-compensating emitter in China. The influence of the elastic diaphragms hardness and thickness on the hydraulic performance of the emitter was studied by means of flow pattern index, starting pressure and compensation range of the labyrinth channel structure emitter were studied. The results show that the hardness and thickness of the elastic diaphragm have significant effects on the emitter flow(P≤0.01), and the hardness had a greater effect on the emitter flow than the thickness. The hardness and thickness of the elastic diaphragm are positively correlated with the flow coefficient, the starting pressure and the compensation interval, and negatively correlated with the flow index. There is an appropriate elastic diaphragm characteristic range, so that different structure pressure-compensating emitters have small starting pressure, minimum flow index and maximum compensation interval. When the elastic diaphragm hardness is 60 HA and thickness is 1.2 mm, the emitters have the minimum flow index of 0.078. The mathematical relationship between the characteristic parameters of the elastic diaphragm and the flow, flow pattern index, starting pressure and compensation interval is established, which can provide a theoretical basis for the rapid development of the pressure-compensating emitter.
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Received: 10 June 2021
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