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

由于轴流压缩机能够产生较高的产量，因此该方案主要针对轴流压缩机。 具有高质量流量和高压比的压缩气体。轴流压缩机有多个叶片排 或作用于流体的翼型，以增加其总热。由于旋转运动的非定常湍流 产生可压缩流动，这往往会引起复杂的气动弹性现象，从而进一步 影响结构的动力特性，引起翼型颤振。如果翼型结构不是设计的 足够的话，它可能会产生灾难性的后果。因此，了解和量化颤振是很重要的 现象有一个安全、可靠和高效的设计。考虑到这项研究的多学科性质 它需要在有限元分析和CFD技术方面的专业知识以及高计算效率 算法和设施。在管理CFD网格时，需要流固耦合(FSI)模型 应与计算结构力学(CSM)进行反应，以获得准确的结果。主要目标是 建议的研究项目的目的是通过执行流体结构来处理和解决这一问题 通过研究3.5级轴流压气机的颤振响应来研究其相互作用。一系列CFD和CSM分析 应在各种发动机运行条件下执行。寿命预测技术公司(LPTi)将 提供压缩机的几何形状，并通过共享他们的资源和知识来分担工作量 在有限元分析和CFD模拟中。在拟议的研究项目中，第一步应包括验证 商业求解器Ansys通过运行已知实验测试用例的能力，这些结果应 并与仿真输出结果进行比较。

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.