Abstract
Gas turbines play a major role in the field of aviation owing to their high power to weight ratio and being self-contained, as compared to other conventional power generating units. The main function of the blades in gas turbines is imparting energy to, or extracting it, from a fluid stream. Since the underlying function of the blades is to smoothly change the velocity of fluid flow, they are generally comprised of parametric sculptured surface models. In absence of design data, the reverse engineering process can be considered as a major tool for modeling. Reverse engineering process involves sensing the geometry of existing part, creating a geometric model of the part from the sensed data and passing this model to an appropriate CAD/CAM system for manufacturing. This paper mainly deals with the modeling and analysis of gas turbine blades. The design data for a turbine blade is obtained using Reverse Engineering technique. Using the data so obtained, a model of the turbine blade is created in ANSYS FEA package. For the given loading conditions, the blade is analyzed for static structural analysis for different materials at varying centrifugal loads and different materials and a safe and feasible material is suggested.
Highlights
The present work deals with the modeling and analysis of a gas turbine blade, whose engineering drawings are unavailable
Straight probe of 0.5 mm diameter is used x Clamp the turbine blade to restrict the degrees of freedom x Selecting the Element option in the main menu of Usoft to probe the edge coordinate of the blade root x Probe at different point along the aero foil section of turbine blade x The output file gives the coordinates of probed points along the blade length
The generated finite element model of the gas turbine blade was analyzed in ANSYS software for the given loading and boundary conditions
Summary
The present work deals with the modeling and analysis of a gas turbine blade, whose engineering drawings are unavailable. The design origin is unknown and has to be manufactured using standard processes. A suitable material for the existing gas turbine blade is suggested, whose design data has been generated using the Reverse Engineering (RE) technique. For mechanical parts the process involves sensing the geometry and passing the sensed data to an appropriate CAD/CAM system for manufacturing. RE of mechanical parts require extraction of information about an instance of the particular part sufficient to replicate the part using appropriate fabrication techniques. Serious challenges must be overcome, for high accuracy of the parts and if models produced from sensed data are to be truly useful for manufacturing. The resulting models can be directly imported into featurebased CAD system without loss of semantics and topological information inherent in the feature-based representation
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