Modulating surge prevention control for a variable geometry diffuser
A method is described for preventing surge of a gas turbine engine compressor having a variable geometry diffuser that is positionable between a maximum open setting and minimum open setting, comprising the steps of: receiving a plurality of signals representative of the engine's inlet temperature, inlet pressure, compressor discharge pressure and the diffuser position respectively; preselecting a compressor pressure ratio representative of minimum permissible surge margin with the diffuser in the maximum open setting; calculating a first maximum compressor discharge pressure from the inlet temperature and pressure signals and the preselected pressure ratio and generating a signal thereof, combining the calculated discharge pressure signal with the discharge pressure signal to form an error signal; preselecting a maximum open setting for the diffuser and adjusting the maximum setting for variations in inlet pressure, and generating a command signal thereof; combining the command signal with the error signal and the diffuser position signal to form a second command signal; receiving the second command signal and generating a control signal for the diffuser; and repeating the previous steps until the error signal is substantially zero.
- Assignee:
- Allied-Signal Inc., Morris Township, NJ (United States)
- Patent Number(s):
- US 5222356; A
- Application Number:
- PPN: US 7-806565
- OSTI ID:
- 6466036
- Resource Relation:
- Patent File Date: 12 Dec 1991
- Country of Publication:
- United States
- Language:
- English
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