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AssigneeGeneral Electric Company
InventorsRoger C. Walker, Scott P. Reese, David L. Joyce, David A. Kastrup
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The invention concerns an active clearance control for controlling clearance between a turbine and a casing in a gas turbine aircraft engine. The invention calculates the instantaneous clearance between a turbine casing and a turbine rotor, based on temperature. Two temperatures are involved. First, a steady state temperature (SSTemp) is computed for the rotor and the casing. SSTemp is a predicted, future temperature, which will be attained when the engine reaches steady state operation. Each SSTemp is computed based on presently occurring engine operating conditions, such as selected temperatures, pressures, and rotational speeds. Changes which occur in the SSTemp's indicate the second temperatures, which are the instantaneous temperatures of the casing and rotor. These changes in SSTemp are caused by changes in the present operating conditions, which occur during engine acceleration and deceleration. The instantaneous temperatures indicate the diameters of the casing and the rotor, and thus the instantaneous clearance between them. In another form of the invention, the computed instantaneous clearance is used to control air which is bled from the fan and ducted onto the casing, in order to attain a desired clearance.
A clearance control for a gas turbine engine, comprising:
A clearance control for a gas turbine engine, comprising:
A clearance control for a gas turbine engine, comprising:
A clearance control for a gas turbine engine, comprising:
A clearance control for a gas turbine engine, comprising:
A clearance control for a gas turbine engine, comprising:
In a clearance control, for controlling clearance between a casing and turbine blades in a gas turbine engine, which controls a valve which applies air to a turbine casing in order to shrink the casing, the improvement comprising:
In a clearance control in a gas turbine engine, in which air is ducted to a turbine casing in order to control the size of the casing by changing temperature of the casing, the improvement comprising
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, which includes a cooling airflow which cools a turbine casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, which includes an airflow which cools a turbine casing, the improvement comprising the step of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, and in which an airflow is ducted to a turbine casing in a duct having a valve, the improvement comprising the steps of:
In a digital active clearance control for a gas turbofan engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a turbine rotor and casing in a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine which contains a turbine rotor which includes a disc and blades, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising the steps of:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
In a digital active clearance control for a gas turbine engine, in which a digital computer controls airflow to a turbine casing, in order to control the size of the casing by adjusting the temperature of the casing, the improvement comprising:
Dependencies are inferred from the claim text.