3D Finite Element Rotor Dynamic Analysis of Turbine Test Rig Rotor-Shaft Systems

Vinod Kumar, N and Prathapanayaka, R and Jai Maruthi, R and Swaroop, S (2021) 3D Finite Element Rotor Dynamic Analysis of Turbine Test Rig Rotor-Shaft Systems. In: Proceedings of the 6th National Symposium on Rotor Dynamics, Singapore.

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Official URL: https://link.springer.com/chapter/10.1007/978-981-...

Abstract

Design of a 385 kW turbine (T385 turbine) to drive the compressor of 1 kN small gas turbine engine is carried out in Propulsion Division, CSIR-NAL. Aero-thermodynamic performance evaluation of designed turbine stage was planned through experimental testing in VTTR, Propulsion Division, CSIR-NAL. The turbine speed is 50,500 rpm at the engine design point, and the equivalent design speed in test rig conditions is 30,000 rpm. Since performance evaluation at higher speeds consists of high-speed rotating components constituting a complex dynamic system, it is of prime importance to consider rotor dynamic characteristics to operate the turbine safely. Test section is designed for the T385 turbine rotor BLISK considering rotor-shaft system with bearings. The dynamic behavior of test rig rotor systems was evaluated for vibration reliability. This paper presents the 3D FE rotor dynamic analysis of T385 turbine rotor-shaft system. The stiffness of bearing supporting structure is evaluated along the direction of stress field using FEA. T385 turbine rig rotor system is modeled in FEA using lumped mass method. All the masses of rotor shaft sytem with inertias are considered in the analysis. The Campbell and response plots are plotted using frequencies and mode shapes to predict the critical speeds and unbalance response, respectively. The critical speeds from Campbell diagram indicates that rotor system is safe to operate in the test rig. The maximum amplitude due to unbalance is within the limits of clearance at the operating conditions. The predicted natural frequencies of T385 rotor system from modal analysis are compared with impact hammer test and frequencies are matching well with analysis.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Gas turbine, T385 turbine rotor, Rotor dynamics, Vibration, FEA, Critical frequencies, Critical speed, Campbell diagram
Subjects: AERONAUTICS > Aerodynamics
ENGINEERING > Mechanical Engineering
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 28 Oct 2022 13:49
Last Modified: 28 Oct 2022 13:49
URI: http://nal-ir.nal.res.in/id/eprint/13704

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