Flutter analysis of multistage compressor of gas turbine engine using fluid-structure interaction (FSI)

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This proposal is focused on the axial compressor since these compressors are capable of producing highly compressed gas with high mass flow rates and pressure ratios. Axial compressors possess multiple blade rows or airfoils that work on the fluid to increase its total enthalpy. Due to the rotary motion unsteady turbulent compressible flow is generated which often gives rise to complex aeroelasticity phenomena that further influence the dynamic behavior of the structure causing airfoil flutter. If the airfoil structure is not designed adequately, it can have catastrophic consequences. It is thus important to understand and quantify the flutter phenomena to have a safe, reliable and an efficient design. Considering the multidisciplinary nature of this problem, it requires expertise in both FEA and CFD techniques along with high computational efficiency algorithms and facilities. The Fluid-Structure Interaction (FSI) models are required where governing CFD grid should react with Computational Structural Mechanics (CSM) for obtaining accurate results. The primary aim of the proposed research project is to approach and solve this problem by performing the Fluid -Structure Interaction on a 3.5 stage axial compressor by studying its flutter response. A series of CFD and CSM analyses shall be performed at various engine operating conditions. Life Prediction Technologies Inc. (LPTi) shall provide the geometry of the compressor and share with the work load by sharing their resources and knowledge in FEA and CFD simulations. In the proposed research project, the first step shall include validating the capability of the commercial solver ANSYS by running known experimental test cases and these results shall in turn be compared with the simulation output.