组合滴灌管抗堵塞性能研究

Experimental Study on the Feasibility of Combined Drip Irrigation Pipes to Ameliorate Emitter Blocking

【目的】研究Φ16滴灌管在含沙量与系统工作压力下滴头堵塞规律并探究组合滴灌管解决滴头堵塞的方法。【方法】采用试验因素完全组合的方法,分选出粒径小于0.10 mm的泥沙,配制成含沙量为1.00、1.25、1.50 g/L的浑水,分别在0.025 MPa和0.075 MPa压力下,针对Φ16滴灌管,采用周期性间歇灌水试验观测滴头流量,结合克里斯琴森均匀系数和滴头相对流量分析Φ16滴灌管的堵塞规律。重新铺设Φ16滴灌管,将原滴头堵塞部位及前后各750 mm滴灌管用Φ20滴灌管替换,组成组合滴灌管,在相同含沙量与系统工作压力下探究组合滴灌管的抗堵塞性能。【结果】0.025 MPa压力下,组合滴灌管能使堵塞部位分布更集中,含沙量为1.25 g/L时,组合滴灌管的抗堵塞性能较明显;0.075 MPa,组合滴灌管抗堵塞性能随泥沙浓度增大而更明显。【结论】组合滴灌管在一定条件下能够改变滴头的堵塞规律,同时能改变滴头堵塞类型。

【Objective】Emitter clogging by sediment is a common issue in drip irrigation and in this paper we studied the feasibility of using multiple drip irrigation pipes to resolve this problem by taking the Φ16 drip irrigation pipe as an example.【Method】The size of the sediment particles in irrigation water was smaller than 0.10 mm and the sediment concentration was 1.00, 1.25 and 1.50 g/L respectively. The working pressure was 0.025 MPa and 0.075 MPa respectively. We used periodic irrigation to control the change in flow rate from the emitter and the clogging of the emitter and the pipe was analyzed using the Christiansen coefficient uniformity. We then relayed the Φ16 pipe and replaced the pipe in the proximity(750 mm) of the clogged emitter by Φ20 pipe to make a combined drip irrigation pipe;its efficacy in alleviating clogging under the same flow rate, working pressure and sediment concentration was re-analyzed experimentally.【Result】Under pressure 0.025 MPa, the combined pipe arrangement made the blockage concentrate at some locations. When the sediment concentration was 1.25 g/L,the efficiency of the system in mitigating clogging was manifest. Under pressure 0.075 MPa, the efficiency of the system in alleviating clogging improved considerably as the sediment concentration increased.【Conclusion】The combined pipe arrangement was able to mitigate pipe clogging under certain conditions and it also changed the type of blockages.