Warning before pump limit or in case of blade failure on a...

Details Warning before pump limit or in case of blade failure on a... Warning before pump limit or in case of blade failure on a...

2006-09-19

2006-09-19

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S017000, C415S047000, C415S118000

Reexamination Certificate

active

07108477

ABSTRACT:
In a method for determination of a surge limit warning (W) for a turbocompressor, or a warning of blade damage, at least two measurement signals (p1, p2; {tilde over (p)}1, {tilde over (p)}2), are determined, a periodicity value (W1; {tilde over (W)}1) is calculated from at least one of the measurement signals (p1, p2; {tilde over (p)}1, {tilde over (p)}2), indicating a measure for the occurrence of periodic signal level changes in the at least one measurement signal (p1, p2; {tilde over (p)}1, {tilde over (p)}2) for a predetermined first time offset (t1), a correlation value (W2; {tilde over (W)}2) is calculated from the at least two measurement signals (p1, p2; {tilde over (p)}1, {tilde over (p)}2), indicating a measure for the similarity of the at least two measurement signals (p1, p2; {tilde over (p)}1, {tilde over (p)}2) to one another for a predetermined second time offset (t2), and the surge limit warning (W) or the warning of blade damage (W) is determined from the periodicity value (W1; {tilde over (W)}1) and the correlation value (W2; {tilde over (W)}2). A method for operation of a gas turbine or of a turbomachine as well as a turbocompressor and a gas turbine have corresponding features.

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He, Computational Study of Rotating-Stall Inception in Axial Compressors, Journal of Propulsion and Power, vol. 13, No. 1, Jan.-Feb. 1997, pp. 31-38.

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