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Modeling, Analysis and Vibrational Behaviour of A Steam Turbine Blade

Roopsandeep Bammidi, K. Siva Prasad, Naresh Kumar Konada

Abstract


In this research work, the 2nd LP stage of 250MW steam turbine that having 102 blades is considered and blade geometry for various cross-sections had developed with inputs given as co-ordinates which is from blade root to tip of the portion by using UNIGRAPHICS. In order to achieve its desired performance for a steam turbine blade, the blade material has to withstand ambient conditions such as loading, temperatures, pressures and, angular velocities. The considered parameters which have a crucial effect on the functioning of steam power plant and may invariably bring down the rated output of a steam turbine. The structural and thermal analyses are carried out for one of the considered blades of above-mentioned stages by using the simulation software called, ANSYS. The stresses obtained from this software and are compared with analytical results. The results also obtained from analytical work matches quite closely with the theoretical work confirming adequacy of model accuracy and assumed boundary conditions. The temperature distributions of entire blade profile is observed and due to failure of the frequency matching obtained by ANSYS, for which there is no probability of any resonance effect.


Keywords


Resonance Effect, Turbine Blade, UNIGRAPHICS, ANSYS, Structural and Thermal Analysis

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References


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