Experimental optimization of a free vortex propeller runner for micro hydro application

Singh, Punit; Nestmann, Franz

doi:10.1016/j.expthermflusci.2009.04.007

Cited by 70 publications

(41 citation statements)

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“…Singh and Nestmann [2,3] investigated the influences of design parameters like the blade profile, blade height and blade number on the performance of a low head axial flow turbine for micro-hydro applications and examined the functionality of the internal performance parameters of the runner. They concluded that the blade number is a more dominating parameter than the blade height, although its variation did not result in major performance gains.…”

Section: 1mentioning

confidence: 99%

Influence of Blade Number on the Flow Characteristics in the Vertical Axis Propeller Hydro Turbine

Byeon¹,

Kim²

2013

International Journal of Fluid Machinery and Systems

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In this paper, the design method of a low-head propeller-type hydro turbine is studied for various numbers of blades on an axial propeller. We also investigate the relationship between geometrical parameters and internal performance parameters, such as angular velocities (100, 200, 300, 400 rpm) and 2.5~4m low heads through a three-dimensional numerical method with the SST turbulent model. The numerical results showed that the blade number had a more dominant influence than the change in heads and rotational speed on the flow characteristics of the turbine. The distributions of pressure and velocity in the streamwise direction of the propeller turbine were graphically depicted. Especially, the relationship among dimensionless parameters like specific speed (N s ), flow coefficient ( φ ) and power coefficient ( � P ) were investigated.

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Section: 1mentioning

confidence: 99%

Influence of Blade Number on the Flow Characteristics in the Vertical Axis Propeller Hydro Turbine

Byeon¹,

Kim²

2013

International Journal of Fluid Machinery and Systems

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“…However, a designer's freedom can also be exercised in choosing the values. They also concluded that having a larger hub-tip diameter ratio yielded lower runner losses [7]. From the velocity diagrams, the radial variation in the flow can be characterized at different sections along the radial coordinates of the blade equally spaced between the hub and tip locations along the length of the blade.…”

Section: (10)mentioning

confidence: 99%

“…For the given gross head of 2 m, the turbine is envisaged to work under a suction head of 1.3-1.4 m and an inlet head with 0.4-0.6 m, which eliminates the need of a closed spiral volute inlet. The volutes of other propeller researchers are closed type since their runners operate at a higher inlet head [7]. The design is based on the specifications provided by J. Susanto and S. Stamp.The open spiral volute has been adapted by [7], [3], and by Asian Phoenix Resources Ltd. in their Powerpal turbines.…”

Section: Open Spiral Volutementioning

confidence: 99%

A Study on Developing Pico Propeller Turbine for Low Head Micro Hydropower Plants in Nepal

Adhikari¹,

Budhathoki²,

Timilsina³

et al. 2014

J. Inst. Engineering

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Most of the turbines used in Nepal are medium or high head turbines. These types of turbines are efficient but limited for rivers and streams in the mountain and hilly region which have considerably high head. Low head turbines should be used in the plain region if energy is to be extracted from the water sources there. This helps in the rural electrification and decentralized units in community, reducing the cost of construction of national grid and also to its dependency, in already aggravated crisis situation.There are good turbine designs for medium to high heads but traditional designs for heads under about 5m (i.e. cross flow turbine and waterwheel) are slow running, requiring substantial speed increase to drive an AC generator. Propeller turbines have a higher running speed but the airfoil blades are normally too complicated for micro hydro installations. Therefore, the open volute propeller turbine with constant thickness blades was ventured as possible solution. Such type of propeller turbine is designed to operate at low inlet head and high suction head. This enables the exclusion of closed spiral casing. Also, the constant thickness blades enable the use of forging process instead of casting of complex airfoil blades. This leads to considerable reduction in manufacturing cost and complexity. A 1kW prototype was designed and scale down model of 185W was fabricated and tested. The runner consisted of five blades of 4mm thickness with camber and twist. The runaway speed of 1058 rpm was attained at design flow rate of 25 l/s. At full load the efficiency of model was found to be about 57%. Applying scaling effects the expected efficiency of the prototype was estimated to be about 60%.

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“…Singh and Nestmann [7] carried out a series of optimization on a particular runner, that included modifications to inlet and exit tip of the blade profiles. They also developed a simple theoretical model to analyze the hydraulic phenomena due to these geometric modifications, which gave a qualitative study to the internal hydraulic phenomena.…”

Section: Introductionmentioning

confidence: 99%

Exit blade geometry and part-load performance of small axial flow propeller turbines: An experimental investigation

Singh

Nestmann

2010

Experimental Thermal and Fluid Science

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Experimental optimization of a free vortex propeller runner for micro hydro application

Cited by 70 publications

References 1 publication

Influence of Blade Number on the Flow Characteristics in the Vertical Axis Propeller Hydro Turbine

Influence of Blade Number on the Flow Characteristics in the Vertical Axis Propeller Hydro Turbine

A Study on Developing Pico Propeller Turbine for Low Head Micro Hydropower Plants in Nepal

Exit blade geometry and part-load performance of small axial flow propeller turbines: An experimental investigation

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