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• W2335432679 abstract "In a High Pressure Turbine (HPT) that is used in combination with a contra-rotating Low Pressure Turbine (LPT), the geometry of the LPT guide vane gives rise to a shock reflection that has a significant impact on the upstream blade. In consequence, both the performance of the HPT and its resistance to High Cycle Fatigue (HCF) failure (i.e., its durability) can be affected. Here, a series of design studies was undertaken in an attempt to mitigate the unsteadiness that arises due to shock interactions in such a turbine. These include proof-of-concept numerical experiments as well as a pair of optimization studies based on a physical model of the time-resolved flowfield in the turbine and full 3D unsteady Reynolds-Averaged Navier Stokes (RANS) analysis. Inherent in all these studies is the idea that since shock reflections arise due to cancellation of the motion induced by the propagation of finite pressure waves, it is possible to re-direct the pressure perturbations to a region of the airfoil that is less deleterious to component life. A new method for estimating the forcing function experienced by the HPT blade is proposed and evaluated. This method, identified as Approximation by Surface Normal Projections (ASNP), requires only the airfoil geometries and locations as input, and is shown to have significant advantages over an approach to 3D aero-design consisting exclusively of time-resolved, multi-row simulations. The implementation of the ASNP method, in conjunction with a genetic algorithm, is shown to have resulted in superior airfoil geometries with respect to preventing HCF failure, and with a reduction of computation time for the analysis of a single airfoil by 4 orders of magnitude." @default.
• W2335432679 created "2016-06-24" @default.
• W2335432679 creator A5030482007 @default.
• W2335432679 date "2013-01-05" @default.
• W2335432679 modified "2023-10-16" @default.
• W2335432679 title "Reducing Shock Interactions in a Single Stage High Pressure Turbine via 3D Aerodynamic Shaping" @default.
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• W2335432679 doi "https://doi.org/10.2514/6.2013-126" @default.
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