Mistuning with Aero-coupling II (Mistuning of Aerodynamically and Structurally Coupled Bladings)

空气耦合 II 失谐（空气动力学和结构耦合叶片的失谐）

基本信息

批准号：
239841452
负责人：
Dr.-Ing. Lars Panning-von Scheidt
金额：
--
依托单位：
Institut für Turbomaschinen und Fluid-Dynamik (TFD)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/239841452?language=en
关键词：
Mistuning Aero coupling II Aerodynamically

项目摘要

The project "Mistuning with aerodynamic coupling II" aims at providing an experimentally verified simulation method for the numerical prediction of mistuned bladed disk vibrations in turbomachinery. The reduced order model (ROM), developed in a previous project, is validated by experimental vibration measurements of various bladeddisk assemblies. The developed program ROMI (Reduced Order Models for Mistuned Turbine Blades) allows numerically efficient vibration simulations under consideration of aerodynamic and nonlinear couplings by shrouds and underplatform dampers. Anaerodynamically coupled compressor blisk and a compressor rotor with nonlinear blade root coupling (dovetail joint) rotating in vacuum are used as experimental demonstrators. The forced vibrations of the blisk, excited by the fluid flow and acoustic speaker excitation, are measured by means of a tip timing system. The experimental invacuostudy of nonlinear blade-disk joints is performed with magnetic excitation and strain gauges. The comparability of numerical and experimental results is ensured by complementing the reduced order model with boundary conditions which are specific to the installed test rigs and their operation conditions (blade root coupling, centrifugalloads, fluid pressure and temperature) and which so far have not been considered in the model. To enable the efficient modelling of geometrically complex fir-tree roots, the reduction method is extended by an additional step to reduce the number of degrees of freedom related to contact interfaces. In addition, the dependence of aerodynamic coupling coefficients on the vibration frequency is studied for different mode shapes. Based on the outcome of this study, an aerodynamic surrogate model is developed for thenumerically efficient approximation of frequency-dependent aerodynamic coupling coefficients.

“气动耦合失谐II”项目旨在为涡轮机械中失谐叶片盘振动的数值预测提供经过实验验证的模拟方法。在之前的项目中开发的降阶模型 (ROM) 通过各种刀片盘组件的实验振动测量进行了验证。开发的程序 ROMI（失谐涡轮叶片的降阶模型）可以在考虑护罩和平台下阻尼器的空气动力和非线性耦合的情况下进行数值高效的振动模拟。气动耦合压缩机叶盘和在真空中旋转的具有非线性叶根耦合（燕尾接头）的压缩机转子被用作实验演示器。由流体流动和声学扬声器激励激发的整体叶盘的受迫振动通过尖端定时系统来测量。利用磁激励和应变仪进行了非线性叶盘接头的真空实验研究。通过用边界条件补充降阶模型，确保了数值结果和实验结果的可比性，这些边界条件特定于已安装的试验装置及其运行条件（叶片根部耦合、离心载荷、流体压力和温度），但迄今为止尚未考虑这些边界条件在模型中。为了能够对几何复杂的枞树根进行有效建模，通过额外的步骤扩展了简化方法，以减少与接触界面相关的自由度数。此外，还研究了不同振型下气动耦合系数对振动频率的依赖性。基于这项研究的结果，开发了一种空气动力学替代模型，用于频率相关空气动力耦合系数的数值有效近似。