微灌设计中管道流量的实用计算方法
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摘要
常见的微灌工程设计的管道流量计算是依据GB/T 50485-2009《微灌工程技术规范》,采用最不利水力条件下的管道运行场景,要求灌水器所有流量变差不超过10%的计算精度下,可以认为毛管或支管其上所有灌水器出水流量是一样的,其上所有灌水器流量的总和就是要计算的毛管或支管的总流量。与此不同,推荐一种不去计算毛管或支管灌水器总数和总流量,而是基于微灌工程设计规范公式(3.2.3-1)的变形,灌溉区域控制面积或灌水器控制面积的概念,提出根据控制面积计算控制区域总流量或灌水器流量总和的方法,从而引出一种实用的、并且满足工程计算精度要求的,管道设计水力分析的流量计算方法。
According to GB/T 50485-2009 Technical Specification for Micro-Irrigation Engineering, the common hydraulic calculation of pipeline network in micro-irrigation engineering design is based on the pipeline operation scenario under the most worst hydraulic running conditions, requiring that all flow variations of the emitter should not exceed 10% for the calculation, assuming that the lateral's flow is the sum of all flow of the emitters installed on it to be analysis and calculation. Different from this, this paper recommends a new method which does not calculate the total number of emitters and total flow of lateral pipe when irrigation, but based on the deformation of the specification formula of(3.2.3-1) of GB/T 50485-2009, the concept of controlled area of lateral irrigation or controlled area of emitter is put forward, and the calculation method of the total flow of lateral controlled area or total flow of emitters according to their controlled area is put forward. A practical method for calculating hydraulic analysis flow of pipeline network for system design is introduced, which meets the requirements of engineering calculation accuracy.
According to GB/T 50485-2009 Technical Specification for Micro-Irrigation Engineering, the common hydraulic calculation of pipeline network in micro-irrigation engineering design is based on the pipeline operation scenario under the most worst hydraulic running conditions, requiring that all flow variations of the emitter should not exceed 10% for the calculation, assuming that the lateral's flow is the sum of all flow of the emitters installed on it to be analysis and calculation. Different from this, this paper recommends a new method which does not calculate the total number of emitters and total flow of lateral pipe when irrigation, but based on the deformation of the specification formula of(3.2.3-1) of GB/T 50485-2009, the concept of controlled area of lateral irrigation or controlled area of emitter is put forward, and the calculation method of the total flow of lateral controlled area or total flow of emitters according to their controlled area is put forward. A practical method for calculating hydraulic analysis flow of pipeline network for system design is introduced, which meets the requirements of engineering calculation accuracy.
引文
[1] 姜伟,邱元锋,李小平,等.复杂管网数学模型及其分析方法[J].中国农村水利水电, 2009,(7):45-47.
[2] 李鸣. 管网基本定理及其数学模型[J].节水灌溉,2001,(1):8-11.
[3] 王春堂, 祝培育, 杨光球.用逐级计算法进行支管水力计算[J].节水灌溉,2000,(5):13-15.
[4] 李永川,白丹,宋立勋,等.微灌田间管网水力计算研究进展[J].电网与清洁能源,2006,22(5):16-19.
[5] 覃通,李鸣.高效节水灌溉管道流量计算原则初探[J].节水灌溉,2015,(5):85-87.
[6] GBT50485-2009,微灌工程技术规范[S].
[7] 李鸣.喷灌系统自适应模拟方法[J].喷灌技术,1988,(4): 8-10.
[2] 李鸣. 管网基本定理及其数学模型[J].节水灌溉,2001,(1):8-11.
[3] 王春堂, 祝培育, 杨光球.用逐级计算法进行支管水力计算[J].节水灌溉,2000,(5):13-15.
[4] 李永川,白丹,宋立勋,等.微灌田间管网水力计算研究进展[J].电网与清洁能源,2006,22(5):16-19.
[5] 覃通,李鸣.高效节水灌溉管道流量计算原则初探[J].节水灌溉,2015,(5):85-87.
[6] GBT50485-2009,微灌工程技术规范[S].
[7] 李鸣.喷灌系统自适应模拟方法[J].喷灌技术,1988,(4): 8-10.