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about design and analysis of gorlov helical turbine

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STUDY,DESIGN AND ANALYSIS OF A TIDAL TURBINE:

STUDY,DESIGN AND ANALYSIS OF A TIDAL TURBINE UNDER THE ESTEEMED GUIDANCE OF PROFESSOR V C A VARA KUMAR BY A VASAVYA A SREE VINEESHA A NAVEEN KUMAR REDDY D V SUBBA REDDY P BHARATH TEJA

Abstract:

Abstract This paper is concerned with the study of a novel design and analysis of cross-flow helical turbine for tidal currents called the ‘ Gorlov Turbine’. It first deals with tidal basic’s for clear understanding…

INTRODUCTION:

INTRODUCTION Why renewables ? What is tidal energy? What causes tides and what is tidal phenomenon? (basic physics)

Tidal energy status:

Tidal energy status Tidal power facilities can be categorised into two main types: Tidal barrages Tidal turbines

Gorlov helical turbine:

Gorlov helical turbine Gorlov corrected Darrieus's engineering error: By twisting the blades slightly, a bit like a strand of DNA, he eliminated the vibrations. And to increase the efficiency.

Hydrodynamics of cross flow turbines:

Hydrodynamics of cross flow turbines power generated per unit cross section area P = 1/2ρv(u 2 -v 2 ) For getting approximate results Computational Fluid Dynamic tools (CFD), SIEMENS NX is used

Gorlov turbine design:

Vertical axis Cross flow Helical bladed Unidirectional rotation Uniform torque Gorlov turbine design In the report Gorlov prepared for the DOE(dept of energy) in 1998 he claims an efficiency value of “about 35%" for a 3 bladed, 24" diameter by 34" height turbine in free water flow of 5 ft/s .

Efficiency:

Efficiency The efficiency of a turbine to produce power is directly related to free stream velocity of the fluid. The maximum efficiency obtained till date is 39% found in a report on research conducted by Verdant Power LLC and GCK Technology Inc. in 2005.

Starting performance and Torque behavior:

Starting performance and Torque behavior The Gorlov turbine design is advantageous because by always having a section of a blade orientated at all positions relative to the fluid flow the possibility for self starting is maximized. Due to the same reason it has less fluctuations, less vibrations and low cyclical stress.

Design Dimensions:

Design Dimensions Diameter = 0.2m Hieght = 0.286m No. of blades = 3 Type of airfoil used = NACA 0018 Chord length = 6.28cm Solidity, σ = nC / п d = 0.3 Helix angle, Φ = tan‾ 1 ( nh / п d) = 43.7

Design model using solid works:

Design model using solid works

Analysis using NX 8.0:

Analysis using NX 8.0 Using nastran fluid/thermal analysis to simulate results with different velocities as input, the behavior of the turbine to fluid flow is studied analytically…

Fluid analysis and results:

Fluid analysis and results

Future work:

Future work We tried to prepare a scale model of the above turbine using PVC but the profile is not achieved. Other fabrication techniques are studied . Using a load cell and tachometer we can find out the torque and angular velocity respectively and efficiency can be accurately measured.

conclusion:

conclusion We surveyed the tidal turbine literature, especially regarding the helical vertical axis turbines. This literature was examined closely to understand the relationships between key turbine design parameters and turbine performance. We have described the design and analysis that is done on a designed model.

Referances :

Referances Tidal Turbines. http://www.soue.org.uk/souenews/issue7/tidalturbines.html, March 2008. Capstone project report, Design and manufacture of cross flow helical turbine. Verdant Power LLC and GCK Technology Inc. Intergration of the Gorlov helical turbine into an optimized hardware/software system platform.Technical report, Amesbury Tidal Energy Project,2005.

Any quiries???:

Any quiries ???

Thank you:

Thank you

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