Modified Disc Model for Over-Speed Burst Margin with Thermal Load and Disc Speed Corrections and Compared with FE Model
Maruthi B H1, K M Narayanappa2, M Krishna3,Venkatarama Reddy4

1Prof. Maruthi B H, Prof. & Head, Department of Mech. Engg, East West Institute of Technology, Bangalore (Karnataka), India.
2Dr. K M Narayanappa, Prof, Department of Mech, Engg, Dr. AIT, Bangalore (Karnataka), India.
3Dr. M Krishna, R&D, Department of Mech. Engg. R V College of Engg., Bangalore (Karnataka), India.
4Dr. M Venkata Rama Reddy, Department of Mech. Engg. BIT, Bangalore (Karnataka), India.

Manuscript received on 18 June 2012 | Revised Manuscript received on 25 June 2012 | Manuscript published on 30 June 2012 | PP: 26-31 | Volume-1 Issue-2, June 2012 | Retrieval Number: B0167041212/2012©BEIESP
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Abstract: The present work was focused on modification of the disc model for over speed burst margin with thermal load and disc speed correction and verify the same with FE model. Hoop stress, radial stress and burst margin were carried out at different speed and thermal loading conditions using both finite element and mathematical model. Investigations are performed based on non-linear problem employing linear analysis tool ANSYS 12.0. A non-linear finite element method was utilized to determine the stress state of the disc / blade segment under operating conditions. In both cases (FE and mathematical model) the numerical burst rotation rate, associated with the loss of stability of the structure, is found to be in good agreement with the each other.
Keywords: Modified Model, Gas Turbine, Over-speed, Thermal load. 

Scope of the Article: Thermal Engineering