Gas turbine engine having controllable inlet guide vanes

1. An inlet guide vane assembly, comprising:

an active control feedback system; and

a plurality of inlet guide vanes each variable between a plurality of positions, wherein a rotational position of each of said plurality of inlet guide vanes is individually varied in response to an output of said active control feedback system.

2. The assembly as recited in claim 1 , wherein each of said plurality of inlet guide vanes include a strut airfoil and a flap airfoil.

3. The assembly as recited in claim 2 , wherein a rotational position of each of said flap airfoils is individually pivotally varied in response to said output of said active control feedback system.

4. The assembly as recited in claim 1 , wherein said active control feedback system includes a plurality of sensors, a controller and a plurality of actuators.

5. The assembly as recited in claim 4 , wherein at least one of said plurality of sensors is mounted to each of said plurality of inlet guide vanes.

6. The assembly as recited in claim 4 , wherein said plurality of sensors are mounted on each of an inner diameter and an outer diameter of an inlet section of a gas turbine engine.

7. The assembly as recited in claim 4 , wherein said plurality of sensors include pressure sensors.

8. The assembly as recited in claim 1 , wherein said plurality of inlet guide vanes are positioned in sectors within an assembly.

9. The assembly as recited in claim 1 , comprising additional inlet guide vane assemblies positioned downstream from said inlet guide vane assembly.

10. The assembly as recited in claim 9 , wherein a plurality of inlet guide vanes of said additional inlet guide vane assemblies are positioned in response to said output from said active control feedback system, wherein said output includes pressure readings from a plurality of sensors and an input from each inlet guide vane assembly positioned upstream from a portion of said plurality of inlet guide vanes being positioned.

11. A gas turbine engine, comprising:

an inlet section;

a compressor section, a combustor section, and a turbine section positioned downstream of said inlet section;

a plurality of inlet guide vanes mounted adjacent said inlet section at a position that is

upstream from said compressor section; and

an active control feedback system having a plurality of sensors and a controller, wherein said controller receives pressure readings from said plurality of sensors and commands the positioning of each of said plurality of inlet guide vanes in response to said pressure readings.

12. The gas turbine engine as recited in claim 11 , wherein said inlet section is a non-line of sight serpentine inlet section.

13. The gas turbine engine as recited in claim 11 , wherein said active control feedback system includes an actuator associated with each of said plurality of inlet guide vanes, and said actuators are operable to position each of said plurality of inlet guide vanes in response to said commands.

14. The gas turbine engine as recited in claim 11 , wherein said plurality of sensors are mounted at both inner diameters and outer diameters of said inlet section.

15. The gas turbine engine as recited in claim 11 , wherein a rotational position of each of said plurality of inlet guide vanes is individually varied in response to said pressure readings.

16. The gas turbine engine as recited in claim 11 , wherein said plurality of inlet guide vanes are positioned in sectors in response to said pressure readings.

17. The gas turbine engine as recited in claim 11 , wherein said plurality of inlet guide vanes are positioned in sectors in response to said pressure readings and an input from each of said plurality of inlet guide vanes positioned upstream relative to a portion of said plurality of inlet guide vanes being positioned.

18. The gas turbine engine as recited in claim 11 , wherein said plurality of inlet guide vanes are positioned individually in response to said pressure readings and an input from each of said plurality of inlet guide vanes positioned upstream relative to a portion of said plurality of inlet guide vanes being positioned.

19. A method of actively controlling a plurality of inlet guide vanes of a gas turbine engine, comprising the steps of:

a) receiving an airflow at an inlet section of the gas turbine engine;

b) sensing a pressure of the airflow at the inlet section; and

c) individually varying a rotational position of each of the inlet guide vanes in response to sensing the pressure.

20. The method as recited in claim 19 , comprising the step of:

d) sensing a second, different pressure at the inlet section; and

e) repositioning each of the inlet guide vanes in response to sensing the second, different pressure.

21. The method as recited in claim 19 , wherein said step b) includes the steps of:

mounting a plurality of pressure sensors at the inlet section of the gas turbine engine; and

generating a distortion map of the airflow at the inlet section based upon the pressure sensed at said step b).

22. The method as recited in claim 21 , wherein said step c) includes one of the steps of:

individually positioning each of the inlet guide vanes in response to analysis of the distortion map; and

positioning the inlet guide vanes in sectors.

23. The method as recited in claim 19 , wherein a first portion of the inlet guide vanes are mounted upstream from a fan section of the gas turbine engine and a second portion of the inlet guide vanes are mounted downstream from the fan section, and said step c) includes

positioning the first portion of the inlet guide vanes in response to the pressure sensed at said step b); and

positioning the second portion of inlet guide vanes in response to at least one of the pressure sensed at said step b) and a positioning of the first portion of the inlet guide vanes.

24. The method as recited in claim 19 , comprising the steps of:

d) sensing a positioning of a plurality of upstream inlet guide vanes that are positioned upstream from the inlet guide vanes to be positioned in said step c); and

e) positioning the inlet guide vanes in response to both the information sensed at said step d) and the pressure sensed at said step b).

25. An inlet guide vane assembly, comprising:

an active control feedback system; and

a plurality of inlet guide vanes each variable between a plurality of positions, wherein each of said plurality of inlet guide vanes is positioned in response to an output of said active control feedback system, each of said plurality of inlet guide vanes including a strut airfoil and a flap airfoil, and wherein a rotational position of each of said flap airfoils is individually pivotally varied in response to said output of said active control feedback system.

26. An inlet guide vane assembly, comprising:

an active control feedback system that includes a plurality of pressure sensors, a controller and a plurality of actuators; and

a plurality of inlet guide vanes each variable between a plurality of positions, wherein each of said plurality of inlet guide vanes is positioned in response to an output of said active control feedback system.

27. A gas turbine engine, comprising:

an inlet section;

a compressor section, a combustor section, and a turbine section positioned downstream of said inlet section;

a plurality of inlet guide vanes mounted adjacent said inlet section; and

an active control feedback system having a plurality of sensors and a controller, wherein said controller receives pressure readings from said plurality of sensors and commands the positioning of each of said plurality of inlet guide vanes in response to said pressure readings, wherein a rotational position of each of said plurality of inlet guide vanes is individually varied in response to said pressure readings.

28. A method of actively controlling a plurality of inlet guide vanes of a gas turbine engine, comprising the steps of:

a) receiving an airflow at an inlet section of the gas turbine engine;

b) sensing a pressure of the airflow at the inlet section;

c) positioning each of the inlet guide vanes in response to sensing the pressure;

f) sensing a second, different pressure at the inlet section; and

g) repositioning each of the inlet guide vanes in response to sensing the second, different pressure.