Mathematical model of hydraulic ram pump system

Li, Jiazhen; Yang, Kun; Guo, Xiumei; Huang, Wei; Shi, Chunrong; Guo, Yong‐Xin; Wang, Tao; Fu, Hui; Pan, Jiajia

doi:10.1177/09576509221075870

Cited by 2 publications

(1 citation statement)

References 20 publications

(29 reference statements)

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“…New attention was given to this old technology at the end of the century [11][12][13][14], and even more recently, due to the increased focus on sustainability and renewable energy sources [15], different studies have focused on the modelling [16,17], design [18] and performance of the ram pump [19][20][21][22][23][24]. Specifically, the authors of [21,22] studied the effects of the waste valve on the performance of the hydram.…”

Section: Analysis Of the Literaturementioning

confidence: 99%

Experimental and Numerical CFD Modelling of the Hydrodynamic Effects Induced by a Ram Pump Waste Valve

Evangelista,

Tortora,

Viccione

2023

Sustainability

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The hydraulic ram pump or hydram is a machine capable of lifting water to a hydraulic head higher than the level of the supply source. It is a sustainable and self-sufficient device: the working principle is based on the rise of abrupt pressure variations occurring in the feeding pipeline when the liquid inside it undergoes a locally sharp change in velocity as a consequence of the sudden closure of the waste valve. Invented in 1772, the pump has been improved over the decades. Due to its simplicity, low cost and reliability, it has been widely used worldwide to provide adequate domestic water supplies, especially before the spreading of electricity and internal combustion engines. In recent years, the new attention placed on sustainability and energy transition from fossil fuels to renewable energy devices has brought a growing interest to this basic machine, essentially forgotten and abandoned in the last century; it seems promising especially in developing countries. The hydram is, in fact, a very simple machine, with only two moving parts, the waste and delivery valves. The efficiency of the hydraulic ram pump is mainly influenced by the characteristics of the waste valve. However, sufficient data are not available for the design of the hydram and the waste valve. In this work, the behaviour of the waste valve of a hydram was simulated by means of Computational Fluid Dynamics (CFD). Velocity and pressure values were analysed for different scenarios with different closing times of the valve. The data obtained from the developed numerical model were compared, in order to verify the validity of the simulations, with those collected during the operation of the hydram placed at the Laboratory of Environmental and Marine Hydraulics (LIDAM) of the University of Salerno, Italy. The numerical model thus obtained can, therefore, be used to identify the ideal configuration of the valve in order to ensure the best performance of the hydram.

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Section: Analysis Of the Literaturementioning

confidence: 99%

Experimental and Numerical CFD Modelling of the Hydrodynamic Effects Induced by a Ram Pump Waste Valve

Evangelista,

Tortora,

Viccione

2023

Sustainability

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Study on a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder

Sun,

Sang,

Liao

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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The displacement of the positive flow pump is controlled by its pilot hydraulic cylinder. The tracking performance of the pump displacement directly affects the energy saving of the hydraulic excavator through power matching. In this article, a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder is studied to improve the mathematical model for controller design. The concept of relative water hammer is first proposed to describe the relative pressure wave acting on the hydraulic piston to illustrate the mechanism of the nonlinearity. Chaotic motion can be generated by the relative water hammer when the hydraulic piston is in a partial stroke. The mathematical model is derived and its critical parameters are analyzed. The simulation and experimental results verify the existence of the relative water hammer and the effect of each critical parameter on the pilot hydraulic cylinder and the positive flow pump.

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Mathematical model of hydraulic ram pump system

Cited by 2 publications

References 20 publications

Experimental and Numerical CFD Modelling of the Hydrodynamic Effects Induced by a Ram Pump Waste Valve

Experimental and Numerical CFD Modelling of the Hydrodynamic Effects Induced by a Ram Pump Waste Valve

Study on a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder

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