Dynamic Analysis of A Steam Turbine With Numerical Approach

Abstract This present work explores the finite element analysis of a steam turbine blade and rotor using ANSYS software. Life cycle assessment of steam turbines is essential to improve there design and maintenance plans, since they should operate more than 20 years with minimum interruptions and without failures and important element of this turbines is the blades and rotor due to their size, mass and cyclic stresses with relatively high frequencies and amplitude. To cope up with this we are using titanium alloy as a material. Different types of loads acting on steam turbine blade and consequential stresses develops in blade are studied. Fatigue stresses are developed on the steam turbine blade due to change in steam speed. The maximum steam speed range (from cut-in to cut-out steam speed) is considered for design of blade as well as predicting the fatigue life of the blade. And in the second part of work we have analyzed in assembly of rotor blade system will run at 8500 and 19000 rpm, the six mode shapes of frequencies are obtained in two different speeds. And we clearly observed at 19000rpm, the frequency increases with respect to modes formed, but here at this stage critical speed is generated