Thermo-Structural Analysis of First Stage Gas Turbine Rotor Blade Materials for Optimum Service Performance

Abstract

During gas turbine operation, the vibration that occurs at high speed, hot gases entering the combustion chamber and other operational factors affect the longevity of gas turbine blade. This paper is focused on the selection of suitable materials that can withstand the severe working condition and thermo-structural analysis using Finite Element method (FEM) to determine the behaviour of each material under service condition. Cambridge Engineering Software (CES) was employed in the material selection process where GTD111, U500 and IN 738 were identified prior to analyzing U500 and IN 738 due to desired mechanical properties over GTD111. Employing ANSYS R15.0 in the steady state thermal analysis, maximum service temperature of 736.49 o C and maximum Total heat flux of 4.345x10 5 W/m 2 was obtained for IN 738 material while maximum service temperature of 728.29 o C and maximum Total heat flux of 4.1746x10 5 W/m 2 was obtained for U500 blade material. For structural static analysis, maximum von-mises stress of 454 MPa and total deformation of 0.16221 obtained for IN 738 while maximum von-mises stress of 416 MPa and total deformation of 0.12125 was obtained for U500 blade material. While the FEA analytical results for both materials exhibited less variations between each other, IN 738 displayed better thermal characteristics, whereas, U500 presented satisfactory structural static results and above all, von-mises stresses obtained for both materials was below their yield strength and melting temperature. Hence, gas turbine blade materials should be assessed thoroughly for structural and thermal conditions before manufacturing.

Design Analysis of Reciprocating Piston for Single Cylinder Internal Combustion Engine

“…According to Ikpe et al [14], Von-mises stress criterion helps in predicting the yield point of a material when subjected to complex loading conditions. The Von-mises failure theory states that a given material under the influence of forces is prone to failure if the Von mises stress resulting from the reaction forces exceed the material yield strength, but if the Von-mises stress value is less than the material's yield strength, such material still has the capacity to accommodate additional forces [15]. This relates to the theory behind elasticity of materials which states that the material can take additional load provided its elastic limit is not exceeded [16].…”

Thermal Power Plant Turbine Rotor Digital Twin Automation Construction and Monitoring System

“…In the field of turbine fault diagnosis, the commonly used diagnostic strategies are comparative diagnosis, logical diagnosis, statistical diagnosis, pattern recognition, diagnosis based on gray theory, fuzzy diagnosis, expert systems, and diagnosis based on artificial neural networks. Bailey established a Bayesian network model, which is mainly used to deal with the damage mechanism of the dynamic blades of turbines and the interaction of failure modes [15]. The experimental results showed that the cracks were closed in the case of the compression part expansion rate of the fatigue cycle.…”

On the Mechanical Behavior of Distinct Auto Wheel Materials Under Static and Dynamic In-service Loading Cycle

“…On the other hand, royal blue which is at the bottom of the color band indicates safe zones as well as the areas with minimum stress concertation on the wheel component. Sky blue indicates the stress level at which the shaft material begins to respond to the applied load, aqua (SVG) blue indicates further stress level from sky blue color [36,37]. Figure 7 shows the maximum Von-mises stress derived from each of the auto wheel material employed in this study.Results shown on the plot in Figure 7 reveals that carbon fibre (T300) had the highest static nodal stress (5.35E+04 N/m^2), followed by magnesium alloy (4.22E+04 N/m^2), 2014-T6 aluminium alloy (3.14E+04 N/m^2 and then cast alloy steel as the least (1.14E+04 N/m^2).…”

“…The centre of the wheel is bored of a circular hole were an axle bearing is tightened about to enable the wheel rotate when a moment generated by the auto engine is applied to the vehicle axle about its axis and the wheel [1]. In other words, the wheel is one of the most important rotating circular member of a vehicle, upon which the tyre is installed in between the flange at a pressure (35)(36)(37)(38)(39)(40) different from the ambient pressure [2,3]. Automobile wheel assembly is one of the most important aspects that determine mobility in automotive applications and its failure can be hazardous if not properly engineered to bring out the best performance, strength, durability and reliability.…”