초록 ▼

The invention is a method for controlling blade tip clearance in a turbine engine having a flowpath extending therethrough, and a system for carrying out the method. The method includes acquiring a first nonpulsating pressure signal PC representative of tip clearance, sensing a second pressure PB su

The invention is a method for controlling blade tip clearance in a turbine engine having a flowpath extending therethrough, and a system for carrying out the method. The method includes acquiring a first nonpulsating pressure signal PC representative of tip clearance, sensing a second pressure PB substantially unaffected by tip clearance, forming an actual ratio of the acquired pressure and the sensed pressure, determining an error E having an actual component and a desired component, the actual component being a function of the actual ratio; and commanding a clearance control system to reduce the error.

대표청구항 ▼

I claim: 1. A method for controlling blade tip clearance in a turbine engine, the engine having a flowpath extending therethrough, the method comprising acquiring a nonpulsating pressure signal representative of tip clearance; sensing a pressure substantially unaffected by tip clearance; forming an

I claim: 1. A method for controlling blade tip clearance in a turbine engine, the engine having a flowpath extending therethrough, the method comprising acquiring a nonpulsating pressure signal representative of tip clearance; sensing a pressure substantially unaffected by tip clearance; forming an actual ratio of the acquired pressure signal and the sensed pressure; determining an error having an actual component and a desired component, the actual component being a function of the actual ratio; and commanding a clearance control system to reduce the error. 2. The method of claim 1 wherein the acquired pressure signal is acquired from a non-flowpath site. 3. The method of claim 1 wherein the actual component of the error is a ratio of the acquired pressure signal and the sensed pressure, and the desired component of the error is a desired ratio of an acquired pressure and a sensed pressure. 4. The method of claim 1 wherein the actual component of the error is an estimated actual clearance and the desired component of the error is a desired clearance. 5. The method of claim 1 wherein the acquired pressure signal is acquired from a cavity inboard of a turbine flowpath and the sensed pressure is burner pressure. 6. A system for controlling blade tip clearance in the turbine of a turbine engine having a flowpath extending therethrough, the system comprising: a first sensor responsive to a nonpulsating first pressure signal representative of tip clearance; a second sensor responsive to a second pressure signal substantially unaffected by tip clearance; a controller for a) forming an actual ratio of the first and second pressure signals; b) determining an error having an actual component and a desired component, the actual component being a function of the actual ratio; c) reducing the error by issuing commands to change the first pressure signal; and wherein the actual component of the error is an estimated actual clearance and the desired component of the error is a desired clearance. 7. The method of claim 6 wherein the first pressure signal is acquired from a cavity inboard of a turbine flowpath and the second pressure signal is sensed in an engine burner.