Title: An investigation and comparative analysis on marine gas turbine rotor blade with cooling holes using FEA

Authors: G. Naresh; K. Raja; B.P.V. Sai Krishna Mukherji; I.N. Niranjan Kumar; V. NagaBhushana Rao

Addresses: Department of Mechanical Engineering, Anil Neerukonda Institute of Technology and Science (ANITS), Sangivalasa-531162, Visakhapatnam, India ' Department of Marine Engineering, Andhra University, Visakhapatnam-530003, AP, India ' Department of Marine Engineering, Andhra University, Visakhapatnam-530003, AP, India ' Department of Marine Engineering, Andhra University, Visakhapatnam-530003, AP, India ' Department of Mechanical Engineering, Raghu Institute of Technology (RIT), Visakhapatnam-531162, India

Abstract: Cooling technology plays a critical role in operating the turbine blade at elevated temperature. The aim of this research work is to keep the entire blade cool enough and thus maintaining the temperature gradients within the blade to an acceptable level. Several cooling techniques have been proposed for the cooling of turbine blades and one such technique is to have radial holes to pass high velocity cooling air along the blade span. Four different models have been developed consisting of a solid blade and blades with varying number of holes. These models have been designed using CATIA and analysed using ANSYS 14.5. Two turbine blade materials namely INCONEL X-750 and NIMONIC-105 have been chosen for comparative analysis. It has been found that NIMONIC-105 might be better suited material for turbine blades. From the analysis, it has been found that the temperature distribution, Von-Misses stress and total deformation are within the safe limits and are optimum for the turbine blade with 13 holes made of NIMONIC-105.

Keywords: gas turbine blades; cooling technology; steady state thermal analysis; structural analysis; marine gas turbines; cooling holes; FEA; finite element analysis; radial holes; INCONEL X-750; NIMONIC-105; temperature distribution; Von-Misses stress; total deformation.

DOI: 10.1504/IJAD.2016.083379

International Journal of Aerodynamics, 2016 Vol.5 No.3/4, pp.202 - 216

Received: 07 Jun 2016
Accepted: 03 Jan 2017
Published online: 24 Mar 2017 *

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