Stability analysis of a turbine rotor system with Alford forces

摘要: Structural vibration limits the performance of turbomachinery in various applications (e.g., power generation equipment and rocket engine turbopumps). Vibration structure can be divided into forced self-excited vibrations, depending on energy source. In latter kind, vibratory motion itself extracts from sources wind, steam, etc.), leading to instability. Inability predict these instabilities during design stage leads costly delays shutdowns after installation. Many vibrations rotor systems asymmetric bearing stiffness non-axisymmetric clearance labyrinth seals) have been identified extensively analyzed by investigators such as Childs [1], Benckert Wachter [2], Millsaps [3]. However, rotordynamic forces due turbines compressors received relatively little attention. Recently, elementary models for aerodynamic which arise with tip (i.e., Alford force ) developed Song Martinez-Sanchez [4, 5]. Furthermore, it is important investigate effects structural response a system. Therefore, fluid–structure interaction analyses aeroelasticity aircraft structures [6]) are needed. effort regard instability has scarce. this paper, model system integrated turbine flow examine stability The scope paper limited force, analytical/numerical methods chosen investigation.