Systems and methods for adjusting a modulation characteristic of a bleed-off valve of a gas turbine engine

Patent metadata

Field	Value
Publication number	US-12313010-B2
Application number	US-202318130514-A
Country	US
Kind code	B2
Filing date	Apr 4, 2023
Priority date	Apr 4, 2023
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

Methods and systems for adjusting a modulation characteristic of a bleed-off valve of a gas turbine engine are described. The method comprises obtaining a first setpoint configuration associated with a first modulation characteristic of the bleed-off valve, obtaining operating conditions of the gas turbine engine, determining an adjustment factor based on the first setpoint configuration and the operating conditions of the gas turbine engine, and adjusting the bleed-off valve to a second setpoint configuration associated with a second modulation characteristic based on the first setpoint configuration and the adjustment factor, the second modulation characteristic being different from the first modulation characteristic.

First claim

The invention claimed is:

1. A method for adjusting a modulation characteristic of a bleed-off valve of a gas turbine engine, the method comprising:
obtaining a first setpoint configuration associated with a first modulation characteristic of the bleed-off valve;
obtaining operating conditions of the gas turbine engine;
determining an adjustment factor based on the first setpoint configuration and the operating conditions of the gas turbine engine; and
adjusting the bleed-off valve to a second setpoint configuration associated with a second modulation characteristic based on the first setpoint configuration and the adjustment factor, the second modulation characteristic being different from the first modulation characteristic.

2. The method of claim 1 , wherein the adjusting to the second setpoint configuration of the bleed-off valve includes adjusting an adjustment device of the bleed-off valve.

3. The method of claim 2 , wherein the adjusting of the adjustment device includes at least one of: changing an orifice class of the bleed-off valve, changing a seat class of the bleed-off valve, turning an adjustment screw on the bleed-off valve, changing a classified baffle of the bleed-off valve, and changing a spring stiffness of the bleed-off valve.

4. The method of claim 1 , wherein the obtaining the first setpoint configuration and the obtaining of the operating conditions of the gas turbine engine includes testing the gas turbine engine in a test cell.

5. The method of claim 1 , further comprising outputting the second setpoint configuration associated with the second modulation characteristic.

6. The method of claim 1 , wherein the bleed-off valve is positioned in a compressor section of the gas turbine engine, and is configured for removing excess air pressure from the compressor section.

7. The method of claim 1 , wherein the determining of the adjustment factor includes using a plurality of multi-dimensional maps associated with the operating conditions of the gas turbine engine, the plurality of multi-dimensional maps defining the adjustment factor as a function of the operating conditions of the gas turbine engine.

8. The method of claim 7 , wherein each multi-dimensional map of the plurality of multi-dimensional maps is associated with a set of the operating conditions of the gas turbine engine.

9. The method of claim 7 , wherein each multi-dimensional map of the plurality of multi-dimensional maps is a two-dimensional map including a plurality of response surfaces, each response surface of the plurality of response surfaces associated with one corresponding adjustment factor.

10. The method of claim 1 , wherein the operating conditions of the gas turbine engine comprise engine inlet pressure, engine inlet temperature, and rotational engine speed.

11. The method of claim 1 , wherein the determining of the adjustment factor comprises:
obtaining an adjustment target;
determining an estimated adjustment increment based on the first setpoint configuration and the operating conditions of gas turbine engine;
comparing the estimated adjustment increment to the adjustment target to obtain a correction factor;
when a condition associated with the estimated adjustment increment is not satisfied:
adjusting the estimated adjustment increment based on the correction factor to produce a modified estimated adjustment increment, and
updating the correction factor based on the modified estimated adjustment increment; and

when the condition associated with the estimated adjustment increment is satisfied, issuing a signal indicative of the adjustment factor.

12. The method of claim 11 , wherein the adjustment target is determined based on the operating conditions of the gas turbine engine.

13. The method of claim 1 , further comprising:
obtaining an adjustment target;
comparing the first setpoint configuration to the adjustment target; and
when a condition associated with the first setpoint configuration is not satisfied, issuing a warning signal to a controller associated with the gas turbine engine.

Assignees

• Pratt & Whitney Canada

Inventors

• Duranleau-Hendrickx Louis
• Coutu Daniel

Classifications

• F05D2270/802

  Calibration thereof · CPC title

• F05D2270/71

  synthesized, i.e. parameter computed by a mathematical model · CPC title

• F05D2270/304

  Spool rotational speed · CPC title

• F05D2270/301

  Pressure · CPC title

• F05D2260/83

  Testing, e.g. methods, components or tools therefor · CPC title