| || Photoelastic Investigation of Turbine Rotor Blade Shrouds
Author : Chandrasekhar, U.;Gururaj, D.;Ramchandra, K.;Padmannabhan, R.
Source : Defence Science Journal ; Vol:38(4) ; 1988 ; pp 431-438
Subject : 621.224 Turbines
Keywords : Photoelastic stress analysis;Gas turbine
Abstract : This paper deals with the photoelastic stress analysis carried out to investigate the premature failure of low pressure turbine rotor blade shrouds of an experimental gas turbine. Stress distribution at the shroud aerofoil interface was studied for the original rectangular shroud geometry by stress freezing the photoelastic model blades under rotating conditions. The combined influence of taper shroud geometry and larger fillet radius in mitigating the shroud stress is studied by the three dimensional photoelastic technique and an optimised shroud geometry subject to the stress requirements of blade material is suggested.
| || Gas Turbine Engine Component Development : An Integrated Approach
Author : Jansen, Willem
Source : Defence Science Journal ; Vol:38(4) ; 1988 ; pp 397-412
Subject : 629.7 Aeronautics
Keywords : Computer aided engineering;Centrifugal compressor;Gas turbine
Abstract : Computer - aided engineering methods have made a significant impact in the design technologies of advanced machinery. These methods have been applied in several areas such as aerodynamics and fluid dynamic theory for high efficiency, stress and vibration theory for reliability, and manufacturing strategies to produce machined components at low cost and with short time schedules. The integration of these various design technologies offer the opportunity for even greater productivity in the engineering design and manufacturing process. This paper addresses the application of various engineering disciplines to the demand of producing a reliable, efficient design and the subsequent manufacture of components with short lead times through the interaction of these computer - aided engineering technologies. The concept is further illustrated by simple cases for a centrifugal compressor and a gas turbine.