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• W576741143 abstract "Linear and Annular cascade test rigs have been widely used for aerodynamic performance and aeromechanical testing of turbine and compressor blades. A sector annular cascade facility AETR was built at KTH for aero elastic turbine blade testing. Despite inherently aperiodic, the facility provides a less complicated and a cost effective way of analyzing blades. The facility consists of a flow settling chamber, a conditioning chamber and a variable annular sector inlet duct to the cascade. Flexible side walls have been built on purpose to ensure sealed guidance of the flow at any arbitrary inflow angle. The flexible side walls not only guide the flow but have a major influence on achieving blade loading periodicity. Therefore the objective of the current work is to study the influence of the side walls configuration on the overall periodicity of the cascade. The work was accomplished in three phases. In the first phase, a parametric model of the whole test rig geometry was created which included the inlet chamber, the bell mouth, inlet /outlet side walls and blade row. The parametric model was required for automatic geometry adaptation for different operating conditions. In the second phase, grid was generated for the whole test rig with special attention to the blade passage, keeping in view various meshing constraints. The requirement was to create a quality structured grid in the passages and tip clearance by keeping the passage mesh periodic. Moreover, high camber of the blade also posed an additional challenge in meeting all the meshing constraints. Phase I and II were accomplished iteratively as certain geometry modifications were needed due to mesh errors caused by geometry translation problems and ease of blocking strategy adopted. In the final phase, a CFD analysis was performed for various operating points and various inlet and outlet wall angles. Phase II and III were also completed iteratively as convergence issues led to consequent improvement of grid. The distinctive feature of the current work was to model, mesh and analyze the test rig as a whole, i.e. it includes inlet chamber, bell mouth and side walls. Majority of the work was dedicated to CAD model and mesh generation. A preliminary CFD analysis performed in phase III gives a partial idea of the test rig performance. Current work can serve as a solid foundation for a more rigorous CFD analysis encompassing wide range of operating points, turbulence and transition models in order to better estimate annular sector cascade performance." @default.
• W576741143 created "2016-06-24" @default.
• W576741143 creator A5060887994 @default.
• W576741143 date "2013-01-01" @default.
• W576741143 modified "2023-09-27" @default.
• W576741143 title "Parametric Study of Operating Conditions in an Annular Turbine Sector Cascade" @default.
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