弹性片特性对压力补偿滴头水力性能的影响

为了探明弹性片性能与滴头水力性能之间的关系,提高建立压力补偿滴头设计方法,采用滴头样品进行水力性能测试,研究了弹性片硬度和厚度对迷宫流道结构滴头流量系数、流态指数、起调压力、补偿区间的影响.结果表明:弹性片硬度和厚度对滴头流量影响具有统计学意义(P≤0.01),且硬度对滴头流量的影响程度大于厚度;弹性片硬度和厚度均与流量系数、起调压力、补偿区间呈正相关关系,与流态指数呈负相关关系;存在适宜的弹性片特性范围,使不同结构压力补偿滴头拥有较小的起调压力、最小的流态指数和最大补偿区间.该试验滴头在弹性片硬度为60 HA、厚度为1.2 mm时,流态指数最小,其值为0.078.建立了弹性片特征参数与滴头流量、流态指数、起调压力和补偿区间的数学关系,可为压力补偿滴头的快速开发提供一定的理论依据.

Effect of elastic diaphragm characteristics on hydraulic performance of pressure-compensating emitter

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.