Author(s): Maneesh Batrani, V Gopalakrishnan , Jatinder Mohan, Naveen Chandra Bhatt, Mukesh K Verma
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 04 , April - 2017
Key aspect to designing any turbine component is to ensure its mechanical integrity. Steam turbine rotor mechanical integrity has traditionally been and still is a concern for Original Equipment Manufacturers (OEMs) across the globe due to their catastrophic nature of failure . Any joint in rotating components always present a great risk for integrity of rotating machinery. One such joint is shrink-fit in rotating components. Many steam turbine rotors of earlier designs especially impulse or low reaction bladed rotors had shrink fit discs fitted onto them. Though shrink fit joints are less employed these days, they are still relevant. This paper discusses the shrink fit design philosophy for rotating components operating at room temperature. Design philosophy includes identification of loads, safety factor, evaluation of stresses and interference etc. Turbine bladed discs, gear wheel etc. are not regular cylindrical shapes, hence employability of classical formulations have limitations. Additional analysis using Finite Element Method is required to substantiate the design. The methodology is validated in design of one rotor having such shrunk on components.
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