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Aerodynamic ROM of blade due to upstream wake[J].计算力学学报,2018,35(3):299~303

Aerodynamic ROM of blade due to upstream wake
Aerodynamic ROM of blade due to upstream wake

DOI：10.7511/jslx20170609002

 作者 单位 李立州 中北大学 机电工程学院, 太原 030051 杨明磊 中北大学 机电工程学院, 太原 030051 张珺 太原学院数学系, 太原 030001 罗骁 中北大学 机电工程学院, 太原 030051 原梅妮 中北大学 机电工程学院, 太原 030051

气动力降阶模型是研究叶片气动弹性振动快速高效的新方法。现有气动力降阶模型的研究主要集中在叶片颤振方面，没有涉及更为常见的上游尾流激励的叶片振动问题。本文提出基于Volterra级数的尾流激励叶片气动力降阶模型，为尾流激励下叶片振动和动静叶干涉振动研究提供了新的思路。采用行波法简化尾流的参数个数，用阶跃信号法识别降阶模型的核函数。二维叶片的算例结果表明，本文方法可以较准确地描述尾流激励引起的叶片气动力振荡，而且计算效率极高。

Aerodynamic reduced order model (ROM) is an efficient method to study aeroelastic vibration of turbo-machine blades.Nowadays, the researches on this topic are mainly focused on flutter analysis.There is no discussion about the forced vibration corresponding to incoming wakes, which is more important for turbo-machine design.In this paper, a Volterra ROM is proposed for describing the aerodynamic forces on the blades induced by wake excitation, which aims to provide an effective way for blade-wake or stator-rotor interaction analysis.Traveling wave method is used to simplify the wake inputs in the ROM.Step method is used to identify the kernels of the ROM.A 2D blade example is used to show the accuracy and efficiency of the ROM.The results show that the method can characterise the aerodynamic forces corresponding to the wakes.