Experimental study on simplification of Darrieus-type hydro turbine with inlet nozzle for extra-low head hydropower utilization

2012 ◽  
Vol 41 ◽  
pp. 376-382 ◽  
Author(s):  
Kai Shimokawa ◽  
Akinori Furukawa ◽  
Kusuo Okuma ◽  
Daisuke Matsushita ◽  
Satoshi Watanabe
Author(s):  
Jinbo Chen ◽  
Abraham Engeda

As a major resource for electricity, hydropower is widely used around the world for renewable energy. Traditionally, large high-capital cost dam equipped with large turbine system is preferred to produce sufficient power supply. However, recently large hydropower system is questioned because of the impact of dams on the local environment, which could be a major barrier for development of large hydropower system. Besides, billions people remain without access to electricity and most of them are in remote and rural location where is not suitable for large hydropower system. Therefore, the utilization of ultra-low-head (ULH) water energy (situations where the hydraulic head is less than 3m or the water flow rate is more than 0.5m/s with zero head) has becomes more attractive. Part I of this paper focus on developing a design methodology for a low-impact, damless Kaplan turbine system for ULH water resource.


Author(s):  
Tarek ElGammal ◽  
Yi-Hsin Yen ◽  
Ryoichi S. Amano ◽  
Joseph Millevolte ◽  
Randal J. Mueller ◽  
...  

In this context, a numerical study was conducted to predict the performance of a small axial Kaplan hydro-turbine of 30 cm diameter that can be manufactured and installed vertically on a low head water level of less than 3 m. As a CFD simulation scheme, Large Eddy Simulation was selected to solve for the variables of turbulent flow due to its high fidelity performance for capturing time-variable turbulence wakes and eddies. Turbine intake tube dimensioning was primarily studied as an affecting element to maximize energy extraction with the set of initial design parameters. The intake tube was tested at six angles (3, 6, 9, 12, 15, 18 degrees) and four lengths (50, 60, 75, 90 cm). The simulations were performed on a pre-determined water height, one diffuser design, and one set of stator-rotor having a rotational speed of 750 rpm. Maximizing the efficiency of a system with less material cost was the primary goal of the comparative study. After that, bellmouth profile was adopted to find out its influence on the system performance. Outcomes have proven the merit of higher slope per side length in enhancing output power with an average of 2.7 percent by full expansion from minimum to the maximum angle. Moreover, a corresponding marginal efficiency raise was observed by increasing intake slope, while it was found that the system acts poorly with longer intake tubes as both power and efficiency go down. Bellmouth profiles, based on the guidelines of the best straight design, significantly improved system output to reach 81 percent efficiency.


2012 ◽  
Vol 5 (1) ◽  
pp. 30-37
Author(s):  
Satoshi Watanabe ◽  
Kai Shimokawa ◽  
Akinori Furukawa ◽  
Kusuo Okuma ◽  
Daisuke Matsushita

2009 ◽  
Vol 2009 (0) ◽  
pp. 381-382
Author(s):  
Shunsuke IWAMOTO ◽  
Daisuke MATSUSHITA ◽  
Kusuo OKUMA ◽  
Satoshi WATANABE ◽  
Akinori FURUKAWA ◽  
...  
Keyword(s):  

2010 ◽  
Vol 2010 (0) ◽  
pp. 399-400
Author(s):  
Shunsuke IWAMOTO ◽  
Daisuke MATSUSHITA ◽  
Kusuo OKUMA ◽  
Satoshi WATANABE ◽  
Akinori FURUKAWA ◽  
...  

Author(s):  
Hiroki KURASAWA ◽  
Yasuyuki NEMOTO ◽  
Izumi USHIYAMA

2010 ◽  
Vol 53 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Kai Shimokawa ◽  
Akinori Furukawa ◽  
Kusuo OKuma ◽  
Daisuke Matsushita ◽  
Satoshi Watanabe
Keyword(s):  

2021 ◽  
Vol 6 ◽  
pp. 213-219
Author(s):  
Shubhash Joshi ◽  
Ajay Kumar Jha

Gravitational Water Vortex power plant is a relatively new plant used to generate hydropower from low head rivers and canals. There has been an increase in research in the field of runner design and canal design for GWVPPs throughout the world. As no definite equations are formulated in case of runners used in a GWVPP, they are currently produced by hit and trial method. This research focuses on studying about the use of a pure reaction turbine, Gorlov turbine, to generate power from a GWVPP. ANSYS Fluent was used to perform computational study while the experimental study was done using helical turbine blades fabricated using a 3-D printer. The energy generated is very low compared to the impulse turbines. Both the computational and experimental study shows that when increasing the aspect ratio of the turbine but keeping the solidity same, the efficiency is increased significantly. However, the studies also show that on increasing the solidity, the efficiency seems to decrease. All the turbines used submerged to 3 different depts and all the results show that increasing the submergence increased the efficiency.


2014 ◽  
Vol 61 ◽  
pp. 43-50 ◽  
Author(s):  
S.J. Williamson ◽  
B.H. Stark ◽  
J.D. Booker

Author(s):  
Pradeep Parajuli ◽  
Pratik Koirala ◽  
Nischal Pokharel ◽  
Hari Prasad Neopane ◽  
Sailesh Chitrakar ◽  
...  
Keyword(s):  

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