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Micro-irrigation capillary tube length hydraulic design method based on a distribution uniformity coefficient

A well-distributed, hydraulic design technology, applied in calculation, electrical digital data processing, special data processing applications, etc., can solve problems such as inability to consider capillary layout and complicated calculation methods

Pending Publication Date: 2019-04-12
CHINA THREE GORGES UNIV
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  • Application Information

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Problems solved by technology

[0003] At present, the design method of micro-irrigation capillary tube length is based on the known capillary tube length, emitter design flow rate and other related design parameters, with the help of traditional trial algorithms such as Newton iteration method, dichotomy method, golden section method, etc. to solve the capillary tube length; The existing problems are: the use of the traditional trial algorithm requires a certain programming basis for the user, the calculation method is relatively complicated, and the design process cannot consider the appropriate capillary arrangement form

Method used

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  • Micro-irrigation capillary tube length hydraulic design method based on a distribution uniformity coefficient
  • Micro-irrigation capillary tube length hydraulic design method based on a distribution uniformity coefficient
  • Micro-irrigation capillary tube length hydraulic design method based on a distribution uniformity coefficient

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Embodiment

[0106] Known information: capillary diameter D = 13.05mm, emitter spacing s e =1.0m, local head loss expansion factor F s =1.15, the relationship between the pressure and flow of the emitter is q=2.413h 0.53 , emitter design flow rate q d =8.0L / h, terrain slope S 0 =0.02, the design standard of uniform distribution coefficient [D U(h) ] = 0.952.

[0107] Case I: When the terrain slope type p=-1, calculate the design pipe length L and the inlet working head h of the one-way reverse slope capillary 0 . The specific design process is as follows:

[0108] 1) Calculate the design working water head h of the emitter d

[0109]

[0110] 2) Use formula (2) to calculate the pipe length design parameter M L

[0111]

[0112] 3) Use formula (1) to calculate the design parameter of pipe length [W LDU ]

[0113]

[0114] according to Figure 7 , the slope ratio has only a unique design value, so the capillary has only a unique design value.

[0115] 4) Use formula (4...

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Abstract

The invention discloses a micro-irrigation capillary tube length hydraulic design method based on a distribution uniformity coefficient. The method comprises the steps that capillary tube length design parameters based on the distribution uniformity coefficient are constructed according to a capillary tube slope ratio and a flow index; and determining a calculation formula of the micro-irrigationcapillary length according to the pipe network arrangement form, and calculating to obtain the capillary length based on the obtained capillary length design parameters based on the distribution uniformity coefficient. On the premise that a distribution uniformity coefficient design standard and other design indexes are given, the pipe length value meeting the distribution uniformity coefficient can be simply and conveniently calculated, the proper arrangement form of the hollow billet is determined, and the working water head of the hollow billet inlet is calculated. The design efficiency ofthe pipe length of the micro-irrigation capillary can be improved; By considering a proper capillary arrangement form, the design pipe length of the capillary is optimized, and the system investment is reduced.

Description

technical field [0001] The invention belongs to the technical field of micro-irrigation capillary design, in particular to a hydraulic design method for micro-irrigation capillary tube length based on distribution uniformity coefficient. Background technique [0002] When the working head at the capillary inlet of micro-irrigation is unknown, it is one of the common hydraulic design tasks to design the capillary length that meets the design flow rate and irrigation uniformity standards of the emitter. At the same time, choosing an appropriate capillary layout can also save investment and improve irrigation quality. The distribution uniformity coefficient is one of the commonly used irrigation uniformity design indicators in China. [0003] At present, the design method of micro-irrigation capillary tube length is based on the known capillary tube length, emitter design flow rate and other related design parameters, with the help of traditional trial methods such as Newton i...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2113/14G06F30/17
Inventor 王亚林鞠学良仇振杰
Owner CHINA THREE GORGES UNIV
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