International Journal of Engineering Research

Vasishta Bhargava ¹, Koteshwara Rao ¹

Affiliations
1 Department of Mechanical Engineering, GITAM University, Hyderabad, Telangana, IN

Abstract

This paper discusses about the effect of rotor solidity on the tip loss occurring from blades of a turbine. The rotation of 3 bladed turbines commonly produces helical wake behind the rotor and subjected to several types of losses. One of the factors involved is loss arising from the blade tip and hub ischolar_main.The performance of a wind turbine is also dependent upon the no of blades and rotor solidity which is function of blade chord. The number of blades increases the rotor solidity as well as tip loss as predicted by Prandtl. Aspects related to aero dynamic theory that proved power coefficient and tip losses are influenced by the solidity parameter. Comparisons of power coefficient using the different rotor lift to drag ratios are evaluated in order to verify the turbine efficiency range at different tip speed ratios.

Keywords

Inflow Angle, Solidity, Tip Loss Factor, Airfoil, Thrust, Momentum, Induction Factor.

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Vasishta Bhargava ¹, Koteshwara Rao ¹, P. Balaji Krushna ¹

Affiliations
1 Department of Mechanical engineering, GITAM University, Hyderabad T.S., IN

Abstract

In this paper BEM& Glauert theory of momentum are investigated for the magnitude of axial induction factor, thrust coefficients and axisymmetric pressure distribution by Kinner. The axial induction factor characteristic is analyzed around the rotor bladein order to determine the extent of velocity gradient in the flow stream relative to free stream. The influence of yaw and wake skew angles on the power coefficient of turbine is analyzed in order to understand the axial induction factor, flow direction from tip of blades in the wake stream and when blade passes the tower. The lift and drag coefficients vary with tip speed ratios and angle of attack and enables to determine the behavior of axial and tangential induction factor observed at different blade locations. The axial induction factor is verified also according to theazimuthal averaged positions of the turbine rotor during the operation.

Keywords

Blade Element Momentum, Thrust Coefficient, Pressure Distribution, Yaw Angle, Axial Induction Factor, Angle of Attack.

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