電廠渦輪機動葉片顫振之研究

Turbomachinery Rotor Blade Flutter in Power Plant

許智能 ； 張琳雅 ； 秦祥睿 ； 蔣小偉 ； 蒯光陸 ； 孫仲宏 ； 林信立

《中華民國振動與噪音工程學會論文集》 2010 (2010/06) Pp. 377-384

https://doi.org/10.30028/CSSVANNUAL.201006.0377

摘要

本研究是以分析覆環式動葉片顫振之主要機制，分析電廠渦輪機動葉片於不同操作環境下是否會發生顫振。因此，分析時需先取得葉片之結構特性，包括自然頻率及振動模態。接著計算出葉片表面的流場性質，再計算出結構運動所產生之非穩定氣動力負載。由於覆環式動葉片設計所造成整體轉子呈現系統模態運動，必須採用週期對稱方法，結合顫振分析系統，計算出整個覆環式動葉片系統之氣動力阻尼，以決定其顫振特性。

關鍵字

旋轉機械 ； 覆環式 ； 非穩定氣動力 ； 顫振

並列摘要

All the rotor blades in turbo-machinery, includingturbojet engines and turbo-generators, have vibrationproblems. The blades are damaged because of vibrationscaused by flutter or forced response. Generally, theshrouded design of the turbine blades with tip shroud ormid-span shroud is used to raise the structural dampingand strength of the rotor blades. This research is primarilyfocused on vibration phenomenon of steam turbine’sshrouded rotor blades. A complete system approach willbe set up to study the main mechanism of shrouded rotorblade vibration, and to analyze the flutter boundary ofTaipower steam turbine rotor blades under differentoperating conditions. The research will start with thedynamic structural properties of the blades includingnatural frequencies and mode shapes. These propertiesalong with flow fields, will be used to calculate theunsteady steam load caused by structural movement. Inaddition, because the design of shrouded rotor blades willcause the entire rotor into system mode shapes, it isnecessary to use cyclic symmetry along with the modalflutter analysis system to calculate the aero damping ofthe shrouded dynamic blade system and to determine itsflutter instability.

並列關鍵字

turbomachinery ； shrouded rotor blade ； unsteady dynamics ； flutter