System and method of determining centrifugal turbomachinery...

Details System and method of determining centrifugal turbomachinery... System and method of determining centrifugal turbomachinery...

2005-04-12

2008-11-11

Nguyen, Ninh H (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Method of operation

C416S039000, C416S044000, C416S061000

Reexamination Certificate

active

07448853

ABSTRACT:
A centrifugal turbomachine includes an impeller and a speed sensor arranged to detect a speed associated with an impeller speed. A temperature sensor is arranged to detect a temperature associated with an impeller exit temperature. A controls system has impeller parameters, which includes the impeller speed and exit temperature. A calculation methodology is used to mathematically manipulate the impeller parameters to determine a remaining life of the impeller. A program response, such as a warning indication, is triggered by the control system in response to the remaining life reaching a threshold. The controls system monitors the speed and temperature of the impeller. The controls system internally calculates the remaining life based upon the speed and the temperature. In one example, a change in remaining life is calculated in response to a change in speed that results in an impeller stress that exceeds an endurance strength for the impeller.

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