Analysis of a pico tubular-type hydro turbine performance by runner blade shape using CFD

Park, J H; Lee, N J; Wata, Joji; Hwang, Y C; Kim, Y T; Lee, Y H

doi:10.1088/1755-1315/15/4/042031

Cited by 7 publications

(4 citation statements)

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“…In the tables, apart from the abbreviations already encountered, N T refers to the turbine shaft rotational speed, N the ideal or expected speed of the alternator shaft, % loss the percentage difference between the actual and ideal alternator shaft speeds and P the computed power. Figure 6 to 8 confirm the general expectation that the alternator shaft speed (N A ) improves with increasing flow rate, a function of flow area, which favors the development of higher torques (Edeoja et al 2016a, Derakhshan and Kasaiean 2012, Park et al 2012, von Flotow 2012, Smith and Bush 2010. Also, it has been shown for this system that N A increases with the number of blades (NOB) before deteriorating after about 10 to 12 blades (Edeoja et al 2016c).…”

Section: Resultssupporting

confidence: 72%

Untitled

2019

AJTE

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Mission ATINER is a World Non-Profit Association of Academics and Researchers based in Athens. ATINER is an independent Association with a Mission to become a forum where Academics and Researchers from all over the world can meet in Athens, exchange ideas on their research and discuss future developments in their disciplines, as well as engage with professionals from other fields. Athens was chosen because of its long history of academic gatherings, which go back thousands of years to Plato's Academy and Aristotle's Lyceum. Both these historic places are within walking distance from ATINER"s downtown offices. Since antiquity, Athens was an open city. In the words of Pericles, Athens"…is open to the world, we never expel a foreigner from learning or seeing". ("Pericles" Funeral Oration", in Thucydides, The History of the Peloponnesian War). It is ATINER"s mission to revive the glory of Ancient Athens by inviting the World Academic Community to the city, to learn from each other in an environment of freedom and respect for other people"s opinions and beliefs. After all, the free expression of one"s opinion formed the basis for the development of democracy, and Athens was its cradle. As it turned out, the Golden Age of Athens was in fact, the Golden Age of the Western Civilization. Education and (Re)searching for the "truth" are the pillars of any free (democratic) society. This is the reason why Education and Research are the two core words in ATINER"s name.

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Section: Resultssupporting

confidence: 72%

Untitled

2019

AJTE

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“…Also, it was highest for the largest nozzle diameter and least for the smallest diameter, affirming that higher number of blades and larger nozzle diameters [49,56]. The variation of the shaft power was highly significant statistically at 0.05 level along the columns (nozzle diameter) confirming the relevance of the effect of the parameter in generating the shaft power required to produce the necessary torques [62,79,87].…”

Section: (A) (B)mentioning

confidence: 67%

Effect of the Number of Splined Blades of a Locally-Fabricated Turbine on the Performance of a Simplified Pico Hydropower System

Edeoja¹,

Lawal²,

Aboje³

et al. 2022

JERR

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The basic operational parameters of a simplified Pico hydropower system were investigated using five locally fabricated turbines with 3, 5, 7, 9 and 11 splined blades in conjunction with a vertical penstock of diameter 0.0762 m and nozzle of diameters 0.0158, 0.0212, 0.0266, 0.0343 and 0.042 m. Water from an overhead reservoir 6.95 m high was discharged through the penstock to the turbines one after the other and recycled to the overhead reservoir using a 1.11 kW pump. For the on-load tests, a 3.9 kVA generator was linked to the system by a 6:1 pulley ratio belt drive. The mean rotational speeds of the shafts of each turbine and generator, volume of water displaced in the reservoirs and electrical quantities were measured for each nozzle diameter, while the shaft power, flow rate and efficiency were then computed. Dimensionless flow, head and power coefficients, and specific speed were computed and a functional characteristic relating them developed. The turbine with 11 blades developed a maximum voltage of 238 V with the largest nozzle diameter and a minimum voltage of 2.3 V with the smallest. The corresponding estimated power output computed using the manufacturer’s specification on the generator were 1765.96 W and 7.613 mW respectively. The mean maximum and minimum efficiencies based on the estimated power output were 0.8797 and 0.0007 respectively. This basically indicates that the larger nozzle diameters combined with the higher number spline blades favour good operation of the system. These show that the system has the potential of being a simple, environmentally friendly and decentralized small power generation system that could potentially contribute to the improvement of the Nigerian energy crisis.

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“…The shaft power increases with an increase in nozzle diameter and was highest in the turbine with 11 blades with a value of about 2100 W. This is because this parameter depends on the turbine speeds developed. Generally, the higher number of blades precipitated higher values of shaft power [95,96].…”

Section: Penstockmentioning

confidence: 99%

Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

Edeoja¹,

Aboje²,

Lawal³

et al. 2022

JENRR

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Five locally fabricated turbines with 3, 5, 7, 9 and 11 flat blades were locally fabricated and tested in conjunction with a vertical penstock of diameter 0.0762 m and nozzles of diameters 0.0158, 0.0212, 0.0266, 0.0343 and 0.042 m in a simplified Pico hydropower system. This study is an aspect of an ongoing work aimed at ultimately implementing the system for small power generation. The turbines were mounted at the foot of an overhead reservoir 6.95 m high. A 1.11 kW pump was used to recycle the water downstream of the turbine from an underground reservoir to the overhead reservoir, and a 3.9 kVA alternator used for the on-load tests. The turbine was linked to a 3.9 kVA alternator by a belt drive of pulley ratio of 6:1. The mean rotational speeds of each turbine and alternator shafts, volume of water displaced, and voltage developed were measured for each nozzle diameter. These data were used to compute flow rate, shaft and electrical power, and efficiency for each operation. Dimensionless flow, head and power coefficients as well as specific speed were computed and functional characteristic curves relating plotted. The turbine with 11 blades developed the maximum voltage with the nozzle diameter of 0.042 m and the least voltage for 0.0158 m diameter nozzle. The corresponding estimated power output computed using the manufacturer’s specifications on the alternator was also highest and the mean maximum efficiency based on the estimated power output was 0.4482. This indicates that the larger nozzle diameters combined with the turbine with higher number of flat blades favour beneficial system operation. The results indicate good potential for the system as a simple, environmentally friendly and decentralized small power generation system that can contribute to the current energy mix in Nigeria.

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Analysis of a pico tubular-type hydro turbine performance by runner blade shape using CFD

Cited by 7 publications

References 1 publication

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Effect of the Number of Splined Blades of a Locally-Fabricated Turbine on the Performance of a Simplified Pico Hydropower System

Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

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