Conjugate Heat Transfer Analysis of Gas Turbine Disc and Cavities

International Journal of Mechanical Engineering

© 2018 by SSRG - IJME Journal

Volume 5 Issue 9

Year of Publication : 2018

Authors : Chethan.K.R, Dr.H.R.Purushothama

10.14445/23488360/IJME-V5I9P104

How to Cite?

Chethan.K.R, Dr.H.R.Purushothama, "Conjugate Heat Transfer Analysis of Gas Turbine Disc and Cavities," SSRG International Journal of Mechanical Engineering, vol. 5,  no. 9, pp. 22-28, 2018. Crossref, https://doi.org/10.14445/23488360/IJME-V5I9P104

Abstract:

The Contemporary gas turbines are operated at very high main stream inlet temperatures to increase the thrust. The turbine inlet temperatures are far above the material temperature limits for turbine blades, these heat from the blade is conducted to blade platform and also to turbine disc. Hence the air is tapped at some stages of compressor and used as coolant. Thermal gradients are developed inside the material as it is exposed to low temperature secondary air. Thermal stress will develop inside the component if the thermal gradient factor is more, this will causes malfunctioning of the components which leads to failure of the disc. In order to avoid this, first we need to know the temperature distribution and thermal gradient over the material. The heat from the blade is transferred to disc and then heat will be taken away by the secondary air by convection. This process can be properly capture by conjugate heat transfer analysis. The primary aim of this project is to estimate the temperature (temperature gradient) on discs and also recognize the flow path inside the cavities. Hence conjugate heat transfer analysis is carried for the static and rotational case by considering it as 2D axi-symmetrical geometry. Mesh has been generated in Ansys pre-processor with acceptable mesh quality of 0.45. The analysis is carried out by using k-ϵ  turbulence model with enhanced wall function, using Ansys Fluent16.0.

Keywords:

Turbine disc, Secondary air flow, Cavities, Conjugate heat transfer

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