System and method for synthesizing engine output power

Patent metadata

Field	Value
Publication number	US-11739696-B2
Application number	US-202117548786-A
Country	US
Kind code	B2
Filing date	Dec 13, 2021
Priority date	Dec 13, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A method and a system for synthesizing output power provided by an engine are provided. The engine comprising a compressor section, a combustor, and a turbine section in serial fluid flow communication. The engine is operated and, during the operating of the engine, a pressure of fluid at an exit of the compressor section, a temperature upstream of the exit of the compressor section, and a fuel flow rate to the engine are determined. A synthesized value of output power provided by the engine is determined based on a product of at least a first factor, a second factor, and a third factor, the first factor being a function of the pressure, the second factor being a function of the temperature, and the third factor being a function of the fuel flow rate. The synthesized value of output power provided by the engine is output.

First claim

The invention claimed is:

1. A method for synthesizing output power provided by an engine, the engine comprising a compressor section, a combustor, and a turbine section in serial fluid flow communication, the method comprising:
operating the engine;
determining, during the operating of the engine, a pressure of fluid at an exit of the compressor section, a temperature upstream of the exit of the compressor section, and a fuel flow rate to the engine;
determining a synthesized value of output power provided by the engine based on a product of at least a first factor determined as a first mathematical function of the pressure and a first constant, a second factor determined as a second mathematical function of the temperature and a second constant, and a third factor determined as a third mathematical function of the fuel flow rate and a third constant; and
outputting the synthesized value of output power provided by the engine.

2. The method of claim 1 , wherein the determining the synthesized value of output power provided by the engine comprises computing the product of the first factor, the second factor, the third factor, and a fourth constant.

3. The method of claim 2 , wherein values of the first constant, the second constant, the third constant, and the fourth constant are determined for bringing a difference between the synthesized value of output power provided by the engine and an actual output power provided by the engine within a predetermined threshold, with the synthesized value of output power provided by the engine being lower than the actual output power provided by the engine.

4. The method of claim 1 , wherein each of the first mathematical function, the second mathematical function, and the third mathematical function is one of an exponential function, a quadratic function, and a logarithmic function.

5. The method of claim 1 , further comprising dividing the pressure by a reference pressure to obtain a normalized pressure and dividing the temperature by a reference temperature to obtain a normalized temperature, the first factor determined as the first mathematical function of the normalized pressure and the first constant, and the second factor determined as the second mathematical function of the normalized temperature and the second constant.

6. The method of claim 1 , wherein the compressor section comprises at least one low compressor stage positioned upstream of at least one high pressure compressor stage, further wherein the determining the pressure of fluid at the exit of the compressor section comprises obtaining at least one pressure measurement from at least one pressure sensor located at an outlet of the at least one high pressure compressor stage.

7. The method of claim 1 , wherein the determining the pressure of fluid at the exit of the compressor section comprises obtaining at least one pressure measurement from at least one pressure sensor located at an inlet of the combustor.

8. The method of claim 1 , further comprising determining the pressure of fluid at the exit of the compressor section from the fuel flow rate.

9. The method of claim 1 , wherein the pressure of fluid at the exit of the compressor section is a first pressure, the method further comprising determining a second pressure of fluid at a location upstream of the exit of the compressor section and computing a ratio of the first pressure to the second pressure, the first factor determined as the first mathematical function of the ratio and the first constant.

10. The method of claim 9 , wherein the compressor section comprises at least one low pressure compressor stage positioned upstream of at least one high pressure compressor stage, further wherein the determining the second pressure comprises obtaining at least one pressure measurement from at least one pressure sensor located at an inlet of the at least one high pressure compressor stage.

11. The method of claim 9 , wherein the determining the second pressure comprises obtaining at least one pressure measurement from at least one pressure sensor located at an inlet of the engine.

12. A system for synthesizing output power provided by an engine, the engine comprising a compressor section, a combustor, and a turbine section in serial fluid flow communication, the system comprising:
a processing unit; and
a non-transitory computer-readable medium having stored thereon instructions executable by the processing unit for:
operating the engine;
determining, during the operating of the engine, a pressure of fluid at an exit of the compressor section, a temperature upstream of the exit of the compressor section, and a fuel flow rate to the engine;
determining a synthesized value of output power provided by the engine based on a product of at least a first factor determined as a first mathematical function of the pressure and a first constant, a second factor determined as a second mathematical function of the temperature and a second constant, and a third factor determined as a third mathematical function of the fuel flow rate and a third constant; and
outputting the synthesized value of output power provided by the engine.

13. The system of claim 12 , wherein the instructions are executable by the processing unit for determining the synthesized value of output power provided by the engine comprising computing the product of the first factor, the second factor, the third factor, and a fourth constant.

14. The system of claim 13 , wherein the instructions are executable by the processing unit for determining values of the first constant, the second constant, the third constant, and the fourth constant for bringing a difference between the synthesized value of output power provided by the engine and an actual output power provided by the engine within a predetermined threshold, with the synthesized value of output power provided by the engine being lower than the actual output power provided by the engine.

15. The system of claim 12 , wherein each of the first mathematical function, the second mathematical function, and the third mathematical function is one of an exponential function, a quadratic function, and a logarithmic function.

16. The system of claim 12 , wherein the instructions are executable by the processing unit for dividing the pressure by a reference pressure to obtain a normalized pressure and dividing the temperature by a reference temperature to obtain a normalized temperature, the first factor determined as the first mathematical function of the normalized pressure and the first constant, and the second factor determined as the second mathematical function of the normalized temperature and the second constant.

17. The system of claim 12 , wherein the compressor section comprises at least one low compressor stage positioned upstream of at least one high pressure compressor stage, further wherein the instructions are executable by the processing unit for determining the pressure of fluid at the exit of the compressor section comprising obtaining at least one pressure measurement from at least one pressure sensor located at one of an outlet of the at least one high pressure compressor stage and an inlet of the combustor.

18. The system of claim 12 , wherein the pressure of fluid at the exit of the compressor section is a first pressure, the instructions executable by the processing unit for determining a second pressure of fluid at a location upstream of the exit of the compressor section and computing a ratio of the first pressure to the second pressure, the first factor determined as the first mathema

Assignees

• Pratt & Whitney Canada

Inventors

• Labrecque Michel
• Nguyen Kevin
• Joshi Ninad

Classifications

• F02C9/16 Primary

  Control of working fluid flow (F02C9/48 takes precedence; control of air-intake flow F02C7/057) · CPC title

• F02C3/04

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title

• F05D2220/30

  in turbines · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title

• F05D2270/053

  Explicitly mentioned power · CPC title