抄録
Diffuser pump instability was studied near the rated condition, in which a positive slope appears slightly in the pump characteristic curve, by analyzing the correlation dimension for unsteady pressure in the pump. As a result of the chaotic analysis, the attractor of pressure data was found to extend spatially at the 80% flow rate more than the one at the design point. Moreover, the correlation dimension took the value of 2.2 to 2.3 for unstable flow, and thus may be utilized as a qualitative measure of instability in diffuser pump.
