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Research on Experiment of the Effect of Dynamic Pressure on the Hydraulic Properties of Drip Emitters

Author: WangCong
Tutor: ShiYuSheng
School: Huazhong University of Science and Technology
Course: Materials Engineering
Keywords: Drip emitters Block Uniformity Fluctuations in water pressure Orthogonal experiment
CLC: S277.95
Type: Master's thesis
Year: 2011
Downloads: 16
Quote: 0
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Abstract


Drip irrigation technology to increase crop yields and solve one of the most effective techniques of irrigation water shortage, but the high operating costs of congestion and drip emitter system severely restricted the use of drip irrigation technology and development. In support of the National Natural Science Foundation project, on the basis of the existing drip irrigation laboratory hydraulic performance testing platform, equipped inverter control hardware, improve the accuracy of the working water pressure and water evenly working water pressure fluctuation pattern for the drip irrigation system and inverter control technology, the emitter flow field-flow state and anti-clogging performance provides a platform for the study of the fluctuations in the water pressure. The impact of fluctuations in water pressure on the hydraulic performance of emitters in the clear water conditions: the basis of water pressure, volatility and fluctuation cycle variable factors of fluctuations and flow characteristics of the experimental design working pressure fluctuation mode, by orthogonal analysis of the the influence of fluctuations in factors emitter discharge; through the use of the difference and fitting and other mathematical tools to calculate and analyze the the fluctuations factors corresponding coefficient to establish the relationship of the fluctuations under conditions equivalent water pressure calculation functions; implementation volatility of single the variable factors fluctuations experimental, research and analysis of the impact of the volatility of emitter flow field-flow state law. Fluctuations in water pressure in the clogged condition Emitter Hydraulic Performance impact: the Shimizu experimental research on the basis, by setting the basis of water pressure fluctuations H, fluctuations in cycle T is a constant factor to the volatility of the W variable factors The embodiment of the four emitters in the mode of four volatility strengthening clogging experiments, analysis of the impact of fluctuations in water pressure in the flow rate of the emitter in four fluctuation pattern, evenness and clogging rate law, the results show as fluctuations in water pressure larger amplitude, the four fluctuation pattern ripple effect waning. Ripple effect works best when the volatility of 2-3m. In summary, this paper, on the basis of micro-irrigation comprehensive hydraulic performance testing platform, through frequency conversion control technology design and fluctuating pressure of work. Basis of water pressure, volatility and fluctuation cycle variable factors, clean water and strengthen the implementation of the different fluctuation mode clogging the experimental analysis of the fluctuations of emitter flow field-flow state, the uniformity of the emitter and anti-clogging performance, the research results will be The development and application of new drip irrigation methods provide an important scientific basis and technical reference.

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CLC: > Agricultural Sciences > Agricultural Engineering > Irrigation and water conservancy > Irrigation and drainage > Drainage and Irrigation Machinery and equipment > Drip irrigation machinery
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