Effects of the geometrical conditions on the performance of a side channel pump: A review

Appiah, Desmond; Yuan, Shouqi; Osman, Majeed Koranteng

doi:10.1002/er.3803

Cited by 29 publications

(12 citation statements)

References 16 publications

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“…The main dimensions of a side channel pump are described in Section 5.1. A good overview of geometrical influence on side channel pumps is given in [14].…”

Section: Theoretical Flow In a Side Channel Pumpmentioning

confidence: 99%

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Mosshammer

Benigni

Jaberg

et al. 2019

IJTPP

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Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical 1-stage side channel pump with an additional radial suction impeller by means of computational fluid dynamics (CFD) simulations. In a first step, the model was successively generated and it was obvious that it has to contain all details including suction impeller and main stage (both 360° models) as well as the pressure housing and all narrow gaps to provide useful simulation results. Numerical simulations were carried out in a stationary and transient way with scale resolving turbulence models to analyse the components in detail. Finally the CFD-simulations were validated with model tests. For the optimisation process it was necessary to generate a reduced numerical model to analyse the effects of more than 300 geometry variations. The findings were then combined to establish the desired objectives. Finally the best combinations were validated again with the full numerical model. Those simulations predict a relative efficiency increase at best efficiency point (BEP) and part load >30% with respect to all given limitations like identical head curve, suction behavior, and dimensions.

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“…The main dimensions of a side channel pump are described in Section 5.1. A good overview of geometrical influence on side channel pumps is given in [14].…”

Section: Theoretical Flow In a Side Channel Pumpmentioning

confidence: 99%

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Mosshammer

Benigni

Jaberg

et al. 2019

IJTPP

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“…The high head developed by the fluid results from the exchange of momentum between the impeller and the side channel. [1]. Although a clearer understanding of the underlying theory regarding the operation of this pump has not been fully achieved, it has been employed widely in many fields of pumping fluids over the past century.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction Based on Effects of Wrapping Angle of a Side Channel Pump

et al. 2019

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This paper seeks to predict the performance of the side channel pump by considering the influences of different wrapping angles. Firstly, three pump cases 1, 2 and 3 are modeled with wrapping angles 15°, 30° and 45°, respectively. Secondly, different physical parameters comprising exchanged mass flow, pressure and velocity distributions are plotted at the best efficiency point (QBEP) to analyze the internal flow characteristics. Since the flow exchange times depend on the size of the wrapping angle, the size of the wrapping angle has significant effects on the pump head performance. Case 1 with the smallest wrapping angle recorded the largest head improvement at all operating conditions compared to case 2 and case 3. Case 1 at QBEP attained a head coefficient increase of about 9.8% and 38.6% compared to that of case 2 and case 3, respectively. However, the size of the wrapping angle had a slight effect on the pump efficiency; thus, case 1 still predicted a marginal increase in efficiency compared to case 2 and case 3 at all operating conditions. Lastly, the numerical simulations were validated with experimental data after manufacturing pump case 2.

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“…The impeller is the core part and it converts the mechanical energy into pressure energy in pumping mode, and vice versa in turbine mode. 14 Appiah et al 15 and Zhang et al 16 indicated that the impeller directly determines the transport capacity which affects the hydraulic performances of hydraulic machines. The impeller geometry consists of the hub, shroud, and the blades that transfer energy to the fluid as shown in Figure 4.…”

Section: Effects Of Geometric Parameter On the Performance Of A Patmentioning

confidence: 99%

Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review

Asomani

Yuan

Wang

et al. 2020

Advances in Mechanical Engineering

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A pump-as-turbine is a hydraulic machine that can operate as a pump and turbine at the same time. Pump-as-turbine happens to be the most appropriate method for meeting the world’s energy demands, particularly in rural and isolated areas of a country. Furthermore, the operating cost of microhydropower systems is lower compared to conventional hydrodynamic turbines, but it requires high initial investment. Pump-as-turbine has been applied in many engineering fields such as irrigation, sewage, reverse osmosis, water distribution systems, farms, small pump storage power house, and pressure dropping valves. However, pump-as-turbine operates inefficiently at part-load due to lack of flow control device. In addition, the pump generates high flow instabilities in pump-as-turbine mode due to the shift of the best efficiency point toward higher head and discharge. This study extensively discusses the flow mechanism, modifications, and flow instabilities in the pump-as-turbine mode operation. First, the mechanism of the pump-as-turbine can be described as drawing out mechanical energy from the flow in the reverse mode. Since the energy drawn mainly depends on the major hydraulic components of the pump (impeller and volute), many studies have been conducted on the impeller and volute. It can be concluded that high amount of hydraulic losses is generated in pump-as-turbine mode operation. This can partly be attributed to the fixed geometrical parameters such as the stationary volute. To increase the usage of pump-as-turbine, it is very crucial to predict their performance in advance before manufacturing, which requires the understanding of the flow behavior as a result of geometrical parameters. In order to improve the energy conversion and understand the flow behavior in the centrifugal pump functioning as pump-as-turbine, the key geometrical parameters should be carefully designed. The designs of the main geometrical parameters do affect not only the hydraulic performance of pump-as-turbine but also the operational instability. The operational instability of hydraulic machines mainly depends on the pressure and the velocity fluctuation intensity generated within the flow passage as a result of the impeller–volute interaction. The magnitudes of the instabilities have the tendency to cause noise, vibration, harshness, and cavitation which reduces the life span of the hydraulic machine. Moreover, appropriate selection of the pump and unavailability of pump data contribute to the challenges faced. Finally, this review proposes specific solutions in terms of geometrical modifications and improvement of the computational design methods to handle the hydraulic losses faced during the pump operation; thus, this study can serve as a point of reference for a pump-as-turbine performance optimization.

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Effects of the geometrical conditions on the performance of a side channel pump: A review

Cited by 29 publications

References 16 publications

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump

Performance Prediction Based on Effects of Wrapping Angle of a Side Channel Pump

Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review

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