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International Journal of Advanced Engineering, Management and Science

Modeling of EDM electrodes for development of LPOT turbine rotor and optimization of parameters for attenuate portioned electrode by Taguchi based Grey Relational Analysis

( Vol-2,Issue-8,August 2016 )

Author(s): Shyam Sankar, Jessin T.A, M.Vittal Naik

Total View : 1084
Downloads : 164
Page No: 1337-1345
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Grey RelationalAnalysis, Inconel 718, LPOT, Taguchi Design of Experiment.


Launch vehicle requires high thrust during lift off. Semi-cryogenic engine using liquid oxygen (LOX) as the oxidiser and kerosene (earth storable) as the fuel, produces thrust around 2000kN. LOX is pumped by Low Pressure Oxidiser Turbo pump (LPOT) to level required for cavitation free operation of the Main Oxidiser Pump (MOP). Inconel 718, the material for LPOT turbine rotor has High strength thermal resistance (HSTS), ignition resistance and property of work hardening, which refers to strengthening of metal by plastic deformation (after the machining pass). The conventional machining processes cannot be adopted to produce complex shapes with high surface finish and accuracy. The non conventional machining technique like EDM is preferred. Due to the closed tip nature of the rotor die sinking EDM is preferred over wire EDM. The LPOT turbine has two rows of rotor blades; 100 symmetric blades and 105 asymmetric blades. The modeling of the EDM electrodes is done in CAD and the trial manufacturing of the electrodes for developing symmetric blade of turbine rotor is carried out. One of the electrode is having a section with 0.4mm thickness. The EDM parameters are optimized for attenuate/thin portioned electrode using Taguchi based Grey Relation Analysis. The most significant parameter using ANOVA is found out. Confirmation test are also performed with optimum parameter combination and an improvement of machining parameter is obtained.

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