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CONJUGATE HEAT TRANSFER ANALYSIS OF DISC AND SECONDARY AIR SYSTEM OF GAS TURBINE
[1]Shivakumar Kandre, Shri. Siva Shankara Reddy [2] and Dr. K.S.Shashi Shekar [3]

Published in: Journal for Advance Research in Applied Sciences
Volume- 4, Issue-1, pp.422-427, Jun 2017
DPI :-> 16.10089.JARAS.2017.V4I1.422427.1740



Abstract
In a Gas turbine, disc metal temperature distribution and temperature gradients are the most important parameters for predicting the disc life. Therefore, it is essential to accurately predict the temperature distribution for the disc life assessment. In order to estimate disc temperature distribution precisely, heat transfer by internal coolant, external hot gas, and metal conduction should be simulated simultaneously by the conjugate heat transfer method. Thus CHT Analysis is carried out for complete secondary air path of 2D Axis-symmetry model that includes HP compressor, HP and LP Turbine disc using FLUENT 16.0 to estimate temperature distributions in the disc as well as secondary air region. The analysis is also carried out to study the effect of heat transfer between the discs, mainstream and secondary air. The steady state pressure based solver is used to solve the computational working domain. Second order upwind scheme is employed for the discretization of the flow and the turbulence equations and are solved through the segregated implicit method. The Realizable k-? model with enhanced wall treatment is used as a turbulence model. From the analysis it is found that the temperature distributions is linear along the disc, temperature gradients are within the allowable limit and maximum temperature values are well below the sustainable temperature of respective materials.

Key-Words / Index Term
Turbine and Compressor discs, Secondary air flow, Conjugate heat transfer.

How to cite this article
[1]Shivakumar Kandre, Shri. Siva Shankara Reddy [2] and Dr. K.S.Shashi Shekar [3] , “CONJUGATE HEAT TRANSFER ANALYSIS OF DISC AND SECONDARY AIR SYSTEM OF GAS TURBINE ”, Journal for Advance Research in Applied Sciences, 4, Issue-1, pp.422-427, Jun 2017. DPI:16.10089.JARAS.V4.I1.1740