滴头最大流量偏差率计算方法及影响因素评价

doi:10.3969/j.issn.1674-8530.2013.04.013

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Abstract The distribution characteristic of emitters′ flow coefficient is analyzed. When flow coefficient complies with normal distribution, the probability of flow coefficient fluctuating at ±3 times standard deviations is 9973％ (approximating 100％). Thus, the minimum flow coefficient is average flow coefficient minus 3 times standard deviation and the maximum flow coefficient is average flow coefficient plus 3 times standard deviation. Based on the above analysis, a comprehensive flow variation rate calculation formula, taking hydraulic variation, manufacture variation and microterrain variation into consideration, is presented. Then, with emitter manufacturing variation coefficient, flow exponent, pressure difference and average field roughness height as influential factors, flow variation rate and lateral cost sensitivity were analyzed. The results show that emitter manufacturing variation coefficient is the most influential factor, followed by flow exponent and pressure difference. The lateral cost increases dramatically when manufacturing variation coefficient is larger than 004. In designing, emitters with minimal manufacture variation and minimal flow exponent should be elected. For normal drip irrigation systems, when the emitter′s waterdrop is larger than 10m, the effects of local height differences in fields on flow variation can be ignored.

Key words： emitters flow coefficient flow variation rate emitter manufacturing variation coefficient flow exponent

Received: 04 July 2012 Published: 30 April 2013

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	ZHU De-Lan
	WU Pu-Te
	ZHANG Lin

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ZHU De-Lan,WU Pu-Te,ZHANG Lin. Calculation method of the maximum flow variation and evaluation of factors for microirrigation engineering[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(4): 340-344.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2013.04.013 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2013/V31/I4/340

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