Abstract
Pelton wheel turbine converts gravitational energy of elevated water into a mechanical work. During the process, the turbine buckets experience equivalent stress and total deformation that lead to material failure due to the impingement of high velocity water jet on it. Bucket angle influences the structural integrity of the turbine bucket. Hence it was intended to simulate and study the effect of bucket angle on the equivalent stress and total deformation using different materials viz. aluminium alloy (A390), austenitic stainless steel (CF20), grey cast iron (325) and martensitic stainless steel (410). In this investigation equivalent stress distribution and total deformation in the bucket have been established at various bucket angles (145°, 150°, 155°, 160° and 165°) for the selected materials. Simulation results revealed that lower values of maximum equivalent stress and total deformation occur at the bucket angle of 155°, for all the materials. And the maximum equivalent stress and total deformation induced in the bucket was inferred to be lower for martensitic stainless steel, at all bucket angles. Based on the simulation results, martensitic stainless steel is proved to be a better material for turbine bucket.
Published Version
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