Study of seals influence to high speed rotor oscillations
Results of a calculation analysis of the influence of flowpath seals’ parameters on the dynamic characteristics of high - speed turbomachine rotors are presented. It is shown that the following factors cause decrease in amplitude of oscillations of a rotor when going through the resonance: increase in density of the working fluid, increase in pressure drop across the seal, reduction of the radial sealing gap, and increase in axial length of the seal. These same factors lead to a multidirectional change in the value of the critical rotor speed compared to the critical rotor speed determined without taking into account the seals.