【摘要】 依据滴灌灌水器的水力特性,基于水力学基本原理,分析研究了水平铺设的低压滴灌毛管在不同流态条件下灌水均匀度Cu与灌水器工作水头hd的关系,并通过实验验证了理论分析的结论;结果表明:在试验条件下滴灌毛管内不同水流流态、灌水器流态指数x时,Cu与hd的变化关系不尽相同,层流时不论x为何值,Cu随hd的增大而增大。层紊流共存时当0<x≤1/1.75,Cu随hd的增大而增大;当1/1.75<x<1,Cu随hd的增大而先增大后减小。紊流时,当0<x<1/1.75,Cu随hd的增大而增大,当x=1/1.75,Cu不随hd的变化而变化;当1/1.75<x<1,Cu随hd的增大而减小。更多还原

【Abstract】 Based on the hydraulic characteristics and the basic principles of hydraulics,the relationship between irrigation uniformity Cu and emitter working head hd in drip irrigation laterals of low pressure under different fluent regime conditions is analyzed,and relevant experiments have verified theoretical results.Results show that under experimental conditions,the change rule of irrigation uniformity Cu and emitter working head hd is different under different flow regime and emitter discharge exponent x conditions.Under laminar conditions,Cu increases along with hd increases and they are independent of x.Under laminar conditions with turbulence,Cu increases as hd increases when 0<x≤1/1.75;Cu increases first and then decreases as hd increases when 1/1.75<x<1.Under turbulent conditions,Cu increases as hd increases when 0.5<x<1/1.75;Cu does not change as hd increases when x=1/1.75;Cu decreases as hd increases when 1/1.75<x<1.更多还原