内镶式滴灌带水力性能试验研究

Experimental study on hydraulic characteristics of integral drip lines

内镶式滴灌带是滴灌系统应用最多的灌水器类型,本研究对不同厂家、不同标称流量、不同压力补偿性能的5种内镶式滴灌带进行压力流量关系测试,探讨在实际工作压力高于、尤其是低于设计工作压力时,灌水器流量和灌水均匀性所受的影响。结果表明:非压力补偿性能滴灌带的流量随工作压力的降低而减小,在滴灌带较短条件下,较低工作压力对滴灌带的流量变差系数和灌水均匀性影响不大。建议滴灌系统运行过程中考虑实际工作压力的大小确定灌水时间的长短,以达到设计灌水量。

The integral drip lines are widely used in drip irrigation systems.The relation between pressure and discharge of 5 kind integral drip lines were measured to analyze the influence of pressure on the discharge and the irrigation uniformity of drip lines.The effect of low-pressure on the discharge and the irrigation uniformity was mainly discussed.The results showed that the discharge of non-pressure compensating drip lines was decreased with the decrease of actual operating pressure.The coefficient of discharge variation and irrigation uniformity was not affected by lower operating pressure under shorter length drip lines.It was suggested that actural operating pressure should be considered in the operation and management of drip irrigation systems to determine suitable irrigation time and achieve predetermined irrigation amount.