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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Model to Design Drip Hose Lateral Line Using Two Spacing between Emitters
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Model to Design Drip Hose Lateral Line Using Two Spacing between Emitters

机译：模型以使用发射器之间的两个间距设计滴水软管横向线

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The use of non-pressure compensating drip hose in horticultural and annual cycle fruits is growing in Brazil. In this case, the challenge for designers is getting longer lateral lines with high values of uniformity. The objective of this study was todevelop a model to design longer lateral lines using non-pressure compensating drip hose. Using the developed model, the hypotheses to be evaluated were: a) the use of two different spacing between emitters in the same lateral line allows longer length;b) it is possible to get longer lateral lines using high values of pressure variation in the lateral lines since the distribution uniformity stays below allowable limits. A computer program was developed in Delphi based on the model developed and it is able to design lateral lines in level using non-pressure compensating drip hose. The input data are: desired distribution uniformity (DU); initial and final pressure in the lateral line; coefficients of relationship between emitter discharge and pressurehead; hose internal diameter; pipe cross-sectional area with the dripper; and roughness coefficient for the Hazen-Williams equation. The program allows calculate the lateral line length with three possibilities: selecting two spacing between emitters anddefining the exchange point; using two pre-established spacing between emitters and calculating the length of each section with different spacing; using one emitter spacing. Results showed that the use of two sections with different spacing between drippers in the lateral line didn't allow longer length but got better uniformity when compared with lateral line with one spacing between emitters; The adoption of two spacing increased the flow rate per meter in the final section which represented approximately 80% of the lateral line total length and this justifies their use. The software allowed DU above 90% with pressure head variation of 40% and the use of two spacing between emitters. The developedmodel/software showed to be accurate, easy to handle and useful for lateral line design using pressure compensating drip hose.
机译：在园艺和年循环水果中使用非压力补偿滴水软管正在增加巴西。在这种情况下，设计人员的挑战越来越长，具有高均匀性的横向线。本研究的目的是使用非压力补偿滴水软管来设计更长的横向线的模型。使用开发的模型，要评估的假设是：a）在相同横向线中的发射器之间使用两个不同间隔允许更长的长度; b）可以使用横向中的压力变化的高值获得更长的横向线由于分布均匀性保持低于允许的限制。基于开发的模型，在Delphi中开发了计算机程序，并且它能够使用非压力补偿滴水软管设计横向线。输入数据是：所需的分布均匀性（DU）;横向线的初始和最终压力;发射极放电与压力头之间的关系系数;软管内径;管道横截面积与滴管; Hazen-Williams方程的粗糙系数。该程序允许使用三种可能性计算横向线长度：在发射器之间选择两个间距，并确定交换点;使用发射器之间的两个预先建立间距并计算具有不同间隔的每个部分的长度;使用一个发射极间隔。结果表明，在横向线之间的滴用机之间使用两个不同间隔的部分不允许更长的长度，但与发射器之间的一个间隔相比，在横向线相比时具有更好的均匀性;通过两个间距的采用增加了最终部分中每米的流量，其占横向总长度的大约80％，这证明了它们的使用。软件允许在90％以上，压力头变异为40％，使用发射器之间的两个间距使用。展开的模型/软件显示精确，易于处理，并使用压力补偿滴水软管对横向线设计有用。

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