不同过滤方式下沉积在滴灌带中的颗粒粒度分布研究--《节水灌溉》2010年02期

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不同过滤方式下沉积在滴灌带中的颗粒粒度分布研究

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【摘要】:水源中的固体颗粒在灌溉过程中随着水流沉积在滴灌管(带)中并引起滴灌系统的堵塞。利用田间灌溉用过的滴灌带作为研究对象.选用了堵塞明显的与堵塞不明显的两类滴灌带,每一种滴灌带从进口分为5段,取出每一段的泥沙颗粒利用激光粒度分布仪对沉积在滴灌带中的颗粒粒度进行分析。分析结果得出:不管滴灌带是否堵塞,较大颗粒都沉积在第2~4段,第1、5段的颗粒粒径相对较小。由于挟沙能力随水流流速迅速减小,在第2、3段的滴头被堵塞的可能性较大。从不同的过滤方式对比分析得出:单独的网式过滤器不能作为滴灌系统的过滤设备,两级网式过滤器可有效减小滤后水中颗粒的粒径。水利论文2j9DUN;N i:G`

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【作者单位】:水利论文 ? P ~#ZX!w/t

a df#|!Z I0中国农业科学院研究生院;中国农业科学院农田灌溉研究所;水利论文aO._"p$I&r4uK

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【关键词】:水利论文C)WQ Y%r:el}L

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滴灌带 颗粒粒径 过滤器水利论文%K9DO5t1? k7ntZ9x

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【基金】:国家自然科学基金项目(E090202)水利论文6n~ o/FpP7ON

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【分类号】:S275.6

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0引言在诸多的节水型灌水技术中,滴灌是水的利用率最高,最为节水的一种灌水技术[1]。滴灌的关键设备是灌水器,在滴头和滴灌管(带)两大类灌水器中,随着滴灌管(带)的出现,单个滴头的应用呈下降趋势,而滴灌带的设计在水力性能、抗堵塞性能、调节性能方面越来越强,且价格明显降低[水利论文U5B;A]-_~

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