抄録
Hydrodynamic tones are radiated from water pumps in some operating condition and the cause of these tone are generated by the self-excited unsteady flow crossing the annular grooves of pump seals. Characteristics of these tone from the annular grooves of seals were experimentally studied by using the test stand for measuring the rotor-dynamics of seals and lubricate bearings with support of the active magnetic bearing. It was made clear that the groove size, the leak flow velocity, the length of seal changed tone frequencies and intensity. The results of study suggest that some acoustic resonance phenomena dominate the generation of the self-excited tone from seal flows. Not only size of groove seal but also the length of annular flow-pass might have some relations to the resonance.
