Numerical and experimental analysis of double-acting plunger pump with constant cross section
[Objective]Integrated irrigation and fertilization has been increasingly used as a water-and fertilizer-saving technology in modern agriculture.However,conventional equipment often suffers from low mechanical efficiency and poor synchronization of water and fertilizer application,limiting its effectiveness.To address these limitations,we designed and evaluated a high-efficiency fertilization pump for integration into irrigation systems.[Method]The device was designed based on the equal-section double-acting pump.We analysed the internal flow characteristics in the pump and established a numerical model to simulate fertiliser flow in the inlet and outlet channels,as well as in the chamber.The k-epsilon turbulence model with enhanced wall treatment wall function was used to increase modelling accuracy.All simulations were conducted using the Fluent software.We first verified that the simulated results met the design requirements for continuous fertiliser flow in the inlet and outlet channels and uniformity of fertilizer application,and then conducted a comparative experiment using the plunger pump and the traditional Venturi fertilizer pump to compare the electric conductivity(EC)of solution in the inlet and outlet channels,as well as the mechanical efficiency of the two pumps.[Result]The simulated results indicated that the new device achieved continuous and uniform fertilizer application.The experimental results showed that the variance in the EC of the solution in the inlet and outlet of the new device was less than 48.5,a significant improvement compared to the variance of 814.8 in the Venturi pump.Furthermore,the new device reduced the fluctuation by 54%;the mechanical efficiency of the new device at 0.30 MPa of working pressure was 56%higher than that of the Venturi pump.[Conclusion]The equal-section double-acting plunger pump demonstrated significant improvements in mechanical efficiency,precise fertilizer application,and seamless integration into water-fertilizer systems.These findings provide valuable insights for optimizing fertiliser application equipment,improving structural design and commercial applications of integrated fertilisation and irrigation apparatus in modern agriculture.
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