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基于能坡線(xiàn)法的微灌雙向異徑毛管設(shè)計(jì)
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中國(guó)科學(xué)院西部之光人才培養(yǎng)計(jì)劃資助項(xiàng)目,、“十二五”國(guó)家科技支撐計(jì)劃資助項(xiàng)目(2011BAD29B02)和教育部,、國(guó)家外國(guó)專(zhuān)家局“111計(jì)劃”資助項(xiàng)目(B12007)


Hydraulic Design of Micro-irrigation Paired Tapered Laterals Based on Energy Gradient Line Method
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    摘要:

    根據(jù)最佳支管位置是位于使兩側(cè)毛管灌水器平均工作壓力相等處的定義,基于能坡線(xiàn)法推導(dǎo)了微灌雙向異徑毛管的最佳支管位置、進(jìn)口工作壓力,、水力流量偏差系數(shù)及極限管長(zhǎng)的計(jì)算公式,,并給出了最佳支管位置參數(shù)的數(shù)值表,。以此為基礎(chǔ),,提出了3種常見(jiàn)設(shè)計(jì)情況下的微灌雙向異徑毛管設(shè)計(jì)步驟,。通過(guò)3個(gè)設(shè)計(jì)實(shí)例表明:該方法準(zhǔn)確可靠,,可以簡(jiǎn)便快速地設(shè)計(jì)各種均勻坡條件下的微灌系統(tǒng)雙向異徑毛管,提高微灌工程設(shè)計(jì)效率,。

    Abstract:

    A simple and easily adaptable analytical approach was developed for the hydraulic design of micro-irrigation paired tapered laterals laid on uniformly sloping grounds based on the definition position locations where the same average emitter pressure head existed in the uphill and downhill laterals. Analytical expressions of the best manifold position, inlet working pressure head, coefficient of variation by hydraulic variation and the 〖JP2〗limited length of the paired tapered laterals were separately developed by using the energy gradient line method. Three tables showed the values used in estimating the design parameters of the best manifold position, inlet working pressure head and coefficient of variation by hydraulic variation, respectively, for the common diameter ratio, 〖JP〗pressure loss ratio and velocity exponent. When the length, diameter and designed emitter flow were given, the best manifold position and other parameters of the paired tapered laterals could be directly designed without using iterative methods. When the diameters, designed emitter flow and water application uniformity criterion were provided, the limited length, the best manifold position and remaining parameters of the paired tapered laterals could be easily determined by Excel Equation-Solver in Microsoft Excel. When the length, designed emitter flow and water application uniformity criterion were provided, the design diameter, the best manifold position and the remaining parameters of the paired tapered laterals could also be easily determined in Microsoft Excel by the iterative technique. Three numerical design examples covering various conditions indicated that the proposed approach could produce accurate results for practical purposes.

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鞠學(xué)良,吳普特,Weckler R Paul,張林,朱德蘭.基于能坡線(xiàn)法的微灌雙向異徑毛管設(shè)計(jì)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(12):47-54. Ju Xueliang, Wu Pute, Weckler R Paul, Zhang Lin, Zhu Delan. Hydraulic Design of Micro-irrigation Paired Tapered Laterals Based on Energy Gradient Line Method[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(12):47-54.

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  • 收稿日期:2015-07-15
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  • 在線(xiàn)發(fā)布日期: 2015-12-10
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