長いシールがポンプ回転体の安定性に及ぼす影響

抄録

The influence of dynamic fluid reaction forces and moments of a long seal on the stability of fluid machinery was investigated. The stability analysis was carried out using a submerged motor pump in a boiler circulate, in order to explain the effect of the long seal. In the stability analysis, the individual contribution of the fluid forces and moments due to rotor conical and cylindrical whirl movements were evaluated according to logarithmic decrements. As a result, the individual contributions depend on the mode shapes of the vibration. The fluid forces acting on the long seal to conical and cylindrical whirl movements should not be ignored because they play an important role in the stability.