Analysis and computerized model of the automatic hydraulic ram pump

Schiller, Eric J.; Kahangire, P.

doi:10.1139/l84-093

Cited by 16 publications

(15 citation statements)

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“…Based on the relationship between dependent and independent parameters in Eqs. (5) to (8), by performing experimental evaluation, the e ect of independent parameters on the ram pump performance was taken into account. By evaluating the ram pump performance versus the e ective parameters on its performance, characteristic curves of ram pump were presented.…”

Section: Methodsmentioning

confidence: 99%

“…They studied various impulse valves and drive pipe diameters experimentally. Schiller and Kahangire [5], by using numerical methods, concluded that the exact theories for predicting the performance of ram pumps were complex. They assumed four phases in ram pump cycle and ignored the e ect of pressure waves during acceleration due to their complexity.…”

Section: Review Of Previous Studiesmentioning

confidence: 99%

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Experimental Evaluation of Effective Parameters on Characteristic Curves of Hydraulic Ram-Pumps

Fatahi-Alkouhi

Lashkar-Ara

2017

Scientia Iranica

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9The effects of non-dimensional parameters on the characteristic curves of a ram pump were evaluated 10 in this study using an experimental model. To do so, after providing dependent and independent 11 parameters using dimensional analysis, effect of each independent parameter was examined on the 12 dependent parameter. Experimental observations showed that relative pumping discharge (q/Q T ), 13 relative wasting discharge (Q/Q T ) and pump efficiency (η) were depended on length to diameter ratio

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Section: Methodsmentioning

confidence: 99%

Section: Review Of Previous Studiesmentioning

confidence: 99%

Experimental Evaluation of Effective Parameters on Characteristic Curves of Hydraulic Ram-Pumps

Fatahi-Alkouhi

Lashkar-Ara

2017

Scientia Iranica

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“…The diameter of valve disc is 120 mm, and the flange thickness is 20 mm. According to equation (1) and equations (10) to (12), the valve opening should satisfy 25 mm s 37 mm. When a waste valve is tuned, other factors such as the available water discharge and durability, should also be considered.…”

Section: Influence Of Valve Openingmentioning

confidence: 99%

Structural design and parameter optimization on a waste valve for hydraulic ram pumps

Yang

Guo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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Hydraulic ram pump is an automatic water-lifting machinery, which converts the low-head potential energy of a large volume of water into a small high-head potential energy through the periodic open and close of waste valve and delivery valve. The pump would run inefficiently or even fail if the valves are poorly designed. In this paper, a novel and reliable waste valve of lift-check-valve structure has been developed. The sealing mode integrating soft and rigid sealing rings, the equation for the valve disc thickness and the equation for the flow passage in terms of the diffuser length, the larger radius and the smaller radius, are presented to guide future design. Major factors influencing the hydraulic performance, including the flow passage, valve opening and valve clack mass, are discussed with model experiments and numerical simulations. The optimized configuration for a 100-mm hydraulic ram pump includes a curved diffuser, 25–30-mm valve opening and 1.2-kg valve clack mass. The proposed waste valve can decrease the head loss coefficient of the system by 45%, achieve relatively higher working efficiency, and lift the largest water when the delivery head is lower than 30 m.

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“…Calvert (5, 6) studied the effect of certain dimensionless groups on ram pump behaviour and Iversen (8). Following Iversen, there was the work of Slack et al (9) and Schiller and Kahangire (10). Unfortunately, none of these studies took account of the OBrien and Gosline theory.…”

Section: Previous Workmentioning

confidence: 99%

Design of Hydraulic Ram Pump Systems

Young

1995

Proceedings of the Institution of Mechanical Engineers, Part A:

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Automatic hydraulic ram pumps are environmentally friendly devices using a renewable energy resource to pump water for domestic or agricultural use. Since being superseded by pumps using electrical or fossil fuel energy nearly a century ago, they are now coming back into favour in many parts of the developing world. I n the past, hydraulic ram pumps have been designed by rules-of-thumb having limited scientific basis. On-site adjustment has been used in the hope of rectifying the inevitable shortcomings of this process and ideal performance is rarely achieved. The present proposal for optimum design allows relevant system parameters (including the beat frequency) to be selected prior to installation. The paper shows how a ram pump system may be designed using two simple equations containing empirical factors dependent upon ram size, delivery head, material and wall thickness of the drive pipe and the configuration of the impulse valve. The design method is illustrated with reference to a number of existing tests. New experimental results for a 53 mm ram with Jive different impulse vdve strokes are also presented.Key words: automatic hydraulic ram pump design, empirical factors, effect of valve stroke, renewable energy NOTATION velocity ratio = uc/uo empirical factor in equation (5) (m-3) cross-sectional area of the drive pipe (m') valve flow area (m') empirical factor in equation (6) (s/m3) velocity of sound (m/s) discharge coefficient drive pipe diameter (m) friction factor acceleration due to gravity (9.8 m/s') delivery head (m) impulse valve head loss at closure (m) maximum delivery head (m) steady state head loss across impulse valve (m) supply head (m) total head prior to impulse valve closure (m) static head to close impulse valve (m) system loss coefficient constant (m/s) constant (s) length of drive pipe (m) impulse valve loss coefficient beat frequency (Hz) quantity delivered (m3/s) capacity of source (m3/s) steady state flow through impulse valve (m3/s) quantity wasted (m3/s) valve stroke (m, mm) wall thickness of drive pipe (m) cycle time (s) velocity to close impulse valve (m/s) steady state velocity (m/s) volume fraction of air trapped in drive pipe Rankine efficiency

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Analysis and computerized model of the automatic hydraulic ram pump

Cited by 16 publications

References 0 publications

Experimental Evaluation of Effective Parameters on Characteristic Curves of Hydraulic Ram-Pumps

Experimental Evaluation of Effective Parameters on Characteristic Curves of Hydraulic Ram-Pumps

Structural design and parameter optimization on a waste valve for hydraulic ram pumps

Design of Hydraulic Ram Pump Systems

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