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.

“用空气动力耦合II误会”项目旨在提供实验验证的仿真方法，用于在涡轮机械中对误后刀片振动的数值预测。在先前项目中开发的降低订单模型（ROM）通过各种BladedDisk组件的实验振动测量值验证。开发的程序ROMI（减少了丢失的涡轮机叶片的订单模型）允许考虑通过裹尸布和下台减震器考虑空气动力学和非线性耦合的数值振动模拟。在真空中旋转的非线性刀片根耦合（燕尾尾关节）的肛门动力学耦合压缩机和带有非线性叶片根耦合的压缩机转子被用作实验示威者。通过流体流动和声音扬声器激发激发的闪电的强制振动是通过尖端正时系统测量的。非线性刀片盘接头的实验无效仪器是用磁激发和应变测量表进行的。数值和实验结果的可比性可以通过与已安装的测试钻机及其操作条件（叶片根耦合，离心机加载，流体压力和温度）的边界条件相互补充，并在模型中尚未考虑。为了实现几何复杂的Fir-Tree根的有效建模，还要通过额外的步骤扩展了还原方法，以减少与接触接口相关的自由度的数量。另外，研究了不同模式形状的空气动力耦合系数对振动频率的依赖性。基于这项研究的结果，开发了空气动力学替代模型，以便在频率依赖性空气动力学偶联系数的当时有效近似。