Performance measurements on a Pelton turbine model

Stamatelos, Fotis G.; Anagnostopoulos, John S.; Papantonis, Dimitris

doi:10.1177/2041296710394260

Cited by 21 publications

(16 citation statements)

References 28 publications

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“…The geometrical characteristics of the Pelton model turbine used as a reference case correspond to a Pelton turbine installed in the LHT, at the National Technical University of Athens ( Figure 3) [22]. The pitch diameter of the runner is 400 mm, and the axis is horizontal with two injectors of 36 mm nozzle diameter.…”

Section: Test Casementioning

confidence: 99%

Flow Modeling in Pelton Turbines by an Accurate Eulerian and a Fast Lagrangian Evaluation Method

Παναγιωτόπουλος

Židonis

Aggidis

et al. 2015

International Journal of Rotating Machinery

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The recent development of CFD has allowed the flow modeling in impulse hydro turbines that includes complex phenomena like free surface flow, multifluid interaction, and unsteady, time dependent flow. Some commercial and open-source CFD codes, which implement Eulerian methods, have been validated against experimental results showing satisfactory accuracy. Nevertheless, further improvement of accuracy is still a challenge, while the computational cost is very high and unaffordable for multiparametric design optimization of the turbine’s runner. In the present work a CFD Eulerian approach is applied at first, in order to simulate the flow in the runner of a Pelton turbine model installed at the laboratory. Then, a particulate method, the Fast Lagrangian Simulation (FLS), is used for the same case, which is much faster and hence potentially suitable for numerical design optimization, providing that it can achieve adequate accuracy. The results of both methods for various turbine operation conditions, as also for modified runner and bucket designs, are presented and discussed in the paper. In all examined cases the FLS method shows very good accuracy in predicting the hydraulic efficiency of the runner, although the computed flow evolution and the torque curve exhibit some systematic differences from the Eulerian results.

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Section: Test Casementioning

confidence: 99%

Flow Modeling in Pelton Turbines by an Accurate Eulerian and a Fast Lagrangian Evaluation Method

Παναγιωτόπουλος

Židonis

Aggidis

et al. 2015

International Journal of Rotating Machinery

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“…The Pelton turbine is kind of impales turbine that convert the gravitation potential energy into the kinetic energy, which the velocity of water jet increases and hitting the blades of the turbine converting to a mechanical energy (shaft rotation), which inanimately convert to electrical energy. There a lot of papers have been published in the last decades about numerical and experimental analysis and design of Pelton turbine [4][5][6][7][8][9][10][11][12][13][14][15][16] to improve the performance and development of Pelton turbine. In addition, there are of papers have been published to study experimentally and numerically the performance of the nozzle used in the hydro-turbine [17]- [28].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Parameters on Pelton Turbine Performance by Using Different Nozzles

Obayes¹,

Qasim²

2017

IJMO

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The aim of this paper is to investigate experimentally the effect of different nozzles, water head and discharge on the performance of Pelton turbine system. The effect of five different nozzles with outlet diameters of (3.61, 5.19, 8.87, 12, and 14.8) mm has been studied. The tip and hub diameter of the Pelton wheel of (269.89, 221.29) mm has been used with different nozzles. A water pump was used to generated the pressure head and volume flow rate. The results show for every certain nozzle that when decreasing the water head lead to reduction in water discharge and this caused reduction in the torque, brake power, efficiency and the rotational speed. In addition, the results show that when increasing in nozzle diameter lead to increasing the discharge and reduction water head. While in the case of constant head of 15 m, the results show that the nozzle with diameter 8.87mm give the best the performance than the others, where the percentage increase in torque, brake power, efficiency and the rotational speed of the turbine are (62.2%, 66.48%, 60%, and 15.35%) respectively with the second nozzle with diameter of 5.19 mm.Index Terms-Pelton turbine, water pump, electrical power, torque, brake power, nozzle.

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“…As mentioned above, complex flow phenomena reduce the accuracy of numerical models of impulse turbine performance. Numerical simulation and design tools need experimental support to validate their accuracy [37]. The following set of works describe previous experimental evaluations of impulse turbine performance, test apparatus designs, and the methodology used to conduct the experiments.…”

Section: Experimental Evaluations Of Performancementioning

confidence: 99%

“…By numerically estimating the losses in the spear valve, a more accurate assertion of the efficiency due to the water jet and bucket interaction could be obtained. Turbine efficiency charts were constructed to show the overall results [37].…”

Section: Experimental Evaluations Of Performancementioning

confidence: 99%

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An Experimental Comparison of the Performance of Two Impulse Micro-Hydro Turbine Impellers

Matheny¹

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The goal of this project was to measure the performance of two micro-hydro Turgo Impulse Turbine Impellers. In 2014, Hydropower accounted for 6% of total electric power produced and 48% of electricity produced by renewable sources in the United States. Micro-hydro power is an established, robust, and versatile technology that can help society produce electric power without the emission of greenhouse gases and with minimal environmental impact. Competition from other renewable energy sources is causing the operational efficiency and power production of microhydro turbines to become increasingly important. This competition puts pressure on manufacturers to improve the quality of their turbine designs and manufacturing methods. Computational fluid dynamics (CFD), combined with numerical methods and increased computing power, have become more widely used tools in the past several decades for design improvement. However, empirically derived performance data is still needed to validate modeling improvements and support further development of hydropower technology. Two impellers were chosen for study because they were used in an operational turbine system that the experiments were modeled after. The first impeller was designed and partially manufactured by Hartvigsen Hydro and assembled by Preston Machine, Inc. The second impeller had been in operation in the turbine system for several years and showed signs of wear. The blades on the two impellers were shaped very differently due to having completely different manufacturers. A test setup was designed and constructed to measure the overall efficiency and power output of both impellers. Two types of performance experiments were conducted. The first experiment determined the most efficient setting for the inlet nozzles which are used to increase the kinetic energy of the water prior to impinging on the turbine impeller. The second experiment measured the efficiency and power output of each impeller while varying the flow rate and shaft speed for each of two impellers. The results were analyzed and displayed as three dimensional maps for graphical interpretation of turbine performance as conditions were varied. The experiments indicate that the new impeller (impeller A) operated most efficiently with a peak efficiency 84.6% (with mechanical losses excluded). The older impeller (impeller B) reached a peak efficiency of 74.8%. Both impellers produced approximately the same amount of shaft power (28.6 hp with mechanical losses included) at their peak operating points. The experiments indicated that both turbines were sensitive to varying conditions and properly managing those conditions is necessary to obtain reliable and efficient energy output over a long operational lifetime.

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Performance measurements on a Pelton turbine model

Cited by 21 publications

References 28 publications

Flow Modeling in Pelton Turbines by an Accurate Eulerian and a Fast Lagrangian Evaluation Method

Flow Modeling in Pelton Turbines by an Accurate Eulerian and a Fast Lagrangian Evaluation Method

Effect of Flow Parameters on Pelton Turbine Performance by Using Different Nozzles

An Experimental Comparison of the Performance of Two Impulse Micro-Hydro Turbine Impellers

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