A hydraulic design method for the pipe diameter of a micro-irrigation capillary pipe based on a flow deviation coefficient
A technology of deviation coefficient and hydraulic design, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve problems such as inability to solve multiple calculation values, failure to consider capillary arrangement form, low design efficiency, etc.
Pending Publication Date: 2019-05-03
CHINA THREE GORGES UNIV
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[0003] At present, the micro-irrigation capillary diameter design method is based on the known capillary length, emitter design flow rate and other related design parameters, with the help of traditional trial methods such as Newton iteration method, dichotomy method and golden section method to solve the capillary diameter; The existing problems are: the design efficiency is low; for the same emitter design flow rate and flow deviation coefficient design standard, there may be one or more pipe diameter calculation values, and the traditional trial method can usually only get one calculation value, which is not applicable In the case of solving multiple calculation values; in addition, the current design process cannot consider the appropriate capillary arrangement form
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[0130] Known information: capillary tube length L = 89.7m, emitter spacing s e =0.3m, local head loss expansion factor F s = 1.10, capillary inlet length ratio u = 1.0, emitter pressure flow relationship is q = 0.411h 0.615 , emitter design flow rate q d =1.5L / h, design standard of flow deviation coefficient [C Vq(h) ] = 0.019.
[0131] Case I: When the terrain slope type p=-1, the terrain slope S 0 =0.005, calculate the design pipe diameter D and the inlet working water head h of the one-way reverse slope capillary 0 . The specific design process is as follows:
[0132] 1) Calculate the design working water head h of the emitter d
[0133]
[0134] 2) Calculate the total number of emitters N
[0135]
[0136] 3) Calculate the Christiansen coefficient F C
[0137]
[0138] 4) Calculate the terrain height difference ΔH between the inlet and the end of the one-way reverse slope capillary S
[0139] ΔH S =pS 0 L=-1×0.005×89.7=-0.449(m)
[0140] 5) Use for...
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The invention discloses a hydraulic design method for a micro-irrigation capillary tube diameter based on a flow deviation coefficient. The method comprises the following steps of 1, constructing capillary tube diameter design parameters based on the flow deviation coefficient according to a capillary tube slope ratio and a flow index; Step 2, determining a calculation formula of the micro-irrigation capillary pipe diameter according to the pipe network arrangement form, and calculating the capillary pipe diameter based on the capillary pipe diameter design parameter obtained in the step 1 based on the flow deviation coefficient; and step 3, judging to obtain the number of designed pipe diameters meeting the flow deviation coefficient according to the relationship between the correspondingslope ratio under the flow index and the capillary pipe diameter design parameters based on the flow deviation coefficient. The design efficiency of the micro-irrigation capillary tube diameter can be improved; By considering a proper capillary arrangement form, the design pipe diameter 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 hydraulic design, in particular to a method for hydraulic design of micro-irrigation capillary diameter based on flow deviation coefficient. Background technique [0002] When the inlet working head is unknown, designing capillary diameters that meet the design flow rate and irrigation uniformity standards of the emitter is one of the common hydraulic design tasks for micro-irrigation capillaries. At the same time, choosing an appropriate capillary layout can also save investment and improve irrigation quality. The flow deviation coefficient is one of the commonly used irrigation uniformity design indicators in China. [0003] At present, the micro-irrigation capillary diameter design method is based on the known capillary length, emitter design flow rate and other related design parameters, with the help of traditional trial algorithms such as Newton iteration method, dichotom...
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IPC IPC(8): G06F17/50
Inventor 王亚林鞠学良仇振杰
Owner CHINA THREE GORGES UNIV