Characterization and selection method of Venturi injectors for pressurized irrigation

Manzano, Juan; Palau, Carmen Virginia; Azevedo, Benito Moreira de; Bomfim, Guilherme Vieira do; Vasconcelos, Denise Vieira

doi:10.5935/1806-6690.20180023

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…Injectors are key pieces of equipment for chemigation systems, and their hydraulic performance determines the quality of the chemigation system to a great extent [7][8][9]. At present, the commonly used injectors include the Venturi injector, differential pressure tanks, and other different types of pumps [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Tang

Chen

Hong

2020

Water

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Injectors are key pieces of equipment for chemigation systems, and their hydraulic performance has a significant effect on chemigation systems and crops. In order to investigate the influence of different working parameters on hydraulic performance for a water-powered proportional injector (PI), three key parameters of inlet and injection flow rate were researched using a one-factor experimental design method. The regression equations between different factors and response variables were established through a response surface method based on one-factor experimental results. Lastly, a mathematical model of the actual injection ratio was established. Some experiments under different, randomly selected parameter combinations were carried out to verify the prediction precision of the mathematical mode. The results showed that the injection flow rate increased first within the differential pressure of 0.05 to 0.10 MPa and then tended towards stability with increasing differential pressure. The injection flow rate decreased by increasing the viscosity and the change in the injection flow rate was small enough when the viscosity was greater than 500 mPa·s. The impact factors, in order of significance, for inlet flow rate were differential pressure, viscosity of injection liquid and setting injection ratio. The impact factors, in order of significance, for injection flow rate were viscosity of injection liquid, setting injection ratio and differential pressure. The regressive model for predicting the actual injection ratio was validated using an experiment and the relative deviation between calculated value and tested value was less than 5.98%, which indicated that the mathematical model had high credibility.

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Section: Introductionmentioning

confidence: 99%

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Tang

Chen

Hong

2020

Water

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“…Tang et al [18] studied the influence of manifold layout and fertilizer concentration on the fertilization time and uniformity of the proportional fertilizer pump. Moreover, Manzano [19] conducted experiments to evaluate the structure and characteristics of the Venturi injector and then proposed a method for selecting the Venturi injector in pressurized irrigation. In the aspect of fertigation applicators performance evaluation, uniformity is commonly utilized as an evaluation index.…”

Section: Introductionmentioning

confidence: 99%

Design, Development, and Performance Evaluation of a Fertigation Device for Distributing Solid Fertilizer

Zhang

Chen

et al. 2020

Water

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Solid fertilizers, which have a low operating cost, are widely applied in Chinese crop fields. In order to distribute solid fertilizer through fertigation, an innovative device with a simple structure was designed, which can feed, dissolve, and distribute fertilizer simultaneously. The parameters of the outlet pipe and fertilizer-feeding component were designed, and a preliminary equation for calculating the fertilizer-feeding flowrate was established. Then experiments were conducted to optimize the established equation. Obtained results showed that the deviation between the measured and the calculated feeding flowrate through the optimized equation was about 5%. This ensured that the fertilizer-feeding flowrate can be adjusted accurately. Experiments were also conducted to explore the effect of the working parameters on the fertilization uniformity of the designed device. It was found that as the fertilization time and inlet water flowrate increases, the fertilization uniformity increases but fertilizer concentration decreases. Based on the obtained results, it is concluded that the designed fertigation device outperforms the conventional pressure differential tank that is normally applied to distribute solid fertilizers.

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Characterization of venturi injector using dimensional analysis

Sobenko

Frizzone

Camargo

et al. 2019

Rev. bras. eng. agríc. ambient.

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Venturi injectors are commonly employed for fertigation purposes in agriculture, in which they draw fertilizer from a tank into the irrigation pipeline. The knowledge of the amount of liquid injected by this device is used to ensure an adequate fertigation operation and management. The objectives of this research were (1) to carry out functional tests of Venturi injectors following requirements stated by ISO 15873; and (2) to model the injection rate using dimensional analysis by the Buckingham Pi theorem. Four models of Venturi injectors were submitted to functional tests using clean water as motive and injected fluid. A general model for predicting injection flow rate was proposed and validated. In this model, the injection flow rate depends on the fluid properties, operating hydraulic conditions and geometrical characteristics of the Venturi injector. Another model for estimating motive flow rate as a function of inlet pressure and differential pressure was adjusted and validated for each size of Venturi injector. Finally, an example of an application was presented. The Venturi injector size was selected to fulfill the requirements of the application and the operating conditions were estimated using the proposed models.

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Characterization and selection method of Venturi injectors for pressurized irrigation

Cited by 4 publications

References 2 publications

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Investigation of Hydraulic Performance Based on Response Surface Methodology for an Agricultural Chemigation Proportional Injector

Design, Development, and Performance Evaluation of a Fertigation Device for Distributing Solid Fertilizer

Characterization of venturi injector using dimensional analysis

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