B-20 流体構造連成解析による翼の共振評価および試験との比較(構造・空力・翼振動,一般講演)

概要

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Nozzle-wake resonance of a low-speed axial fan blade is numerically analyzed, and compared with the test. The numerical method is fluid-structure interaction (FSI) calculation, which combines unsteady structural FEM and unsteady CFD. Advantage of this method is that it can include the effects of real geometry, blade/vane arrangement, aerodynamic damping, added mass etc. In this study commercial codes are used for both CFD and FEM. On the other hand, the authors have built a test rig of low-speed two-stage axial fan, specially designed for this study. The 2nd rotor blades are intentionally designed to have a resonance of 1st bending mode near design speed. "Vibratory stress, amplitude, and unsteady surface pressure of 2R blades were measured. Comparison of measurement and calculation revealed the potential of FSI method. Though there were some discrepancies between prediction and measurement, the blade response was reasonably explained by lift fluctuation estimated from blade surface pressure.
2009-10-21