Full-scale Structural Testing of 500 kW Wind Turbine Blade

Veera Sesha Kumar, C and Jayaraman, M (2013) Full-scale Structural Testing of 500 kW Wind Turbine Blade. Project Report. National Aerospace Laboratories.

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Abstract

This report presents briefly the details of full scale structural static test that was carried out on the composite blade of 500 kW wind turbine. The objectives of the structural static test were to assess the strength and stiffness parameters of the blade for the critical wind load case, to experimentally determine the deflections and strains at critical locations and finally to validate the design. Though the blade was designed for class III, as defined by Germanischer Lloyd (GL), the blade was tested for a load case corresponding to a wind velocity of 25 m/s; since this is the maximum wind velocity measured in the installation site over last 25 years. A rig was designed using tubular truss members to withstand the moments produced by the thrust load and the gravity load. The blade was mounted on the test rig using T-bolt in the same way it is attached the hub. The gust load on the entire blade was applied as four discrete concentrated loads. The loads were applied by means of mechanical screws and a winch. The deflections at selected locations were measured using pointer and graph sheet. The strains were measured using foil type electrical resistance strain gauges and a data logger system. A maximum deflection of 685 mm was measured at the blade tip and a maximum compressive strain of -787 µs was measured on the suction surface of the blade at a distance of 12500 mm from blade root. The measured value of deflection and strain were in good agreement with FEA predicted values. Thus the blade responded in the test as per the design.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Wind Turbine Blade, T-Bolt Connection, Gust wind load
Subjects: RENEWABLE ENERGY > Wind Energy
Depositing User: C Veera Sesha Kumar
Date Deposited: 21 May 2014 06:12
Last Modified: 21 May 2014 06:12
URI: http://nal-ir.nal.res.in/id/eprint/11556

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