Abstract
The present study aims to control the leakage flow and total pressure loss in high pressure turbines. A new tip shape is proposed. It is based on the triple squealer shape by adopting a new middle squealer, along the camber line, whose first and last thirds were removed. An unstructured, finite volume, multiblock, 3-D, compressible Reynolds-Averaged Navier-Stokes equations solver was used to compute the flow through a high pressure turbine cascade. The turbulent viscosity was calculated by the Delayed Detached Eddy Simulation (DDES) model which is based on the Spalart-Allmaras one equation turbulence model. The performance of the new shape is compared to that of flat tip, double and triple squealers. The results successfully demonstrate that the new shape has the least total pressure loss among them.
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