Abstract
Axial vibration characteristics of centrifugal turbopumps are extremely complex. In the balance piston system, the axial vibration due to flow passing through the balance orifice occurs in some cases. Normally, the swirl flow may suppress the axial self-excited vibrations. But the mechanism is unclear. Therefore, in this study, we manufactured an experimental apparatus including a partial model of the balance piston in the centrifugal turbopump, and the effects of swirl flow on the vibration performance of the balance piston in the centrifugal turbopump are investigated. As a result, it is noted that the peak value on displacement from FFT at 120Hz decreases as the swirl flow increases.
