薄壁微喷带沿程水头损失试验研究

Experimental Study on Water Head Loss Along Thin-wall Spray-irrigation Pipe

【目的】研究薄壁型微喷带沿程水头损失的水力性能。【方法】采用控制变量法与L9(34)正交试验方案,对折径为N43、N45、N50、N64 mm的微喷带进行沿程水头损失水力性能试验,获取流量、长度、折径与水头损失等试验数据,分析流量、长度、折径三因素对沿程水头损失的影响程度以及水头损失相关水力性能参数,提出了沿程阻力系数,对沿程水头损失计算公式参数进行修改,得出了薄壁型微喷带水头损失计算参数。【结果】薄壁型微喷带沿程水头损失随着压力与铺设长度的增大而增大;折径、流量、长度的F值分别为90.314、26.056、19.041,表明对沿程水头损失影响依次减小。【结论】采用修改后的沿程水头损失计算参数计算薄壁型微喷带沿程水头损失值与试验值吻合较好。

【Objective】Energy loss is an important parameter in designing pipe network, and this paper experimentally studied water head loss in thin-wall spray-irrigation pipes.【Method】The control variable method and L9(34) orthogonal test were used to examine water head loss along thin-wall spray-irrigation pipes with diameter of N43 mm, N45 mm, N50 mm and N64 mm respectively. The flow rate and water head loss in each experiment were measured, from which we analyzed the impact flow rate, length and diameter of the pipe on water head loss.We then proposed a frictional resistance coefficient, modified the formula for water head loss, and applied it to the thin wall spray-irrigation pipe.【Result】The water head loss increased with operating pressure and the length of the pipe. The associated F value for impact of the pipe diameter, flow rate and the pipe length on water head loss was 90.314, 26.056 and 19.041 respectively, indicating that water head loss was most affected by pipe diameter and least by pipe length with flow rate between.【Conclusion】The modified formula for calculating water head loss was consistent with experimental data.