High fidelity integrated heat transfer and clearance in component-level dynamic turbine system control
First Claim
1. A system comprising:
- a rotary apparatus comprising a rotor and a housing, the rotor and the housing forming a gas path therebetween;
a control law for controlling flow along the gas path; and
a processor for generating an output to direct the control law, the processor comprising;
an output module for generating the output as a function of a plurality of rotor and housing temperatures defined along the gas path;
a plurality of temperature modules for determining time derivatives of the rotor and housing temperatures;
a thermodynamic module for modeling boundary conditions along the gas path, based on the rotor and housing temperatures;
a comparator for determining errors in the boundary conditions; and
an estimator for estimating the rotor and housing temperatures based on the time derivatives, such that the errors are minimized and the flow is controlled along the gas path;
wherein the output comprises a heat transfer signal based on heat transfer from the flow to the rotary apparatus, and wherein the control law controls the flow along the gas path by controlling fuel flow to the rotary apparatus based on the heat transfer signal.
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Accused Products
Abstract
A system comprises a rotary apparatus, a control law and a processor. The rotary apparatus comprises a rotor and a housing forming a gas path therebetween, and the control law controls flow along the gas path. The processor comprises an output module, a plurality of temperature modules, a thermodynamic module, a comparator and an estimator. The output module generates an output signal as a function of a plurality of rotor and housing temperatures defined along the gas path, and the temperature modules determine time derivatives of the rotor and housing temperatures. The thermodynamic module models boundary conditions for the gas path, and the comparator determines errors in the boundary conditions. The estimator estimates the rotor and housing temperatures based on the time derivatives, such that the errors are minimized and the flow is controlled.
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Citations
20 Claims
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1. A system comprising:
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a rotary apparatus comprising a rotor and a housing, the rotor and the housing forming a gas path therebetween; a control law for controlling flow along the gas path; and a processor for generating an output to direct the control law, the processor comprising; an output module for generating the output as a function of a plurality of rotor and housing temperatures defined along the gas path; a plurality of temperature modules for determining time derivatives of the rotor and housing temperatures; a thermodynamic module for modeling boundary conditions along the gas path, based on the rotor and housing temperatures; a comparator for determining errors in the boundary conditions; and an estimator for estimating the rotor and housing temperatures based on the time derivatives, such that the errors are minimized and the flow is controlled along the gas path; wherein the output comprises a heat transfer signal based on heat transfer from the flow to the rotary apparatus, and wherein the control law controls the flow along the gas path by controlling fuel flow to the rotary apparatus based on the heat transfer signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling flow along a gas path between a rotor and a housing, the method comprising:
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modeling boundary conditions along the gas path, wherein the boundary conditions comprise an inlet temperature, and inlet pressure, an exit temperature and an exit pressure; determining errors in the boundary conditions, based on thermodynamic constraints along the flow path; modeling material temperatures for a plurality of rotor and housing materials along the gas path, based on the inlet temperature; generating a control signal based on the material temperatures and on coefficients of thermal expansion of the rotor and housing materials; determining time rates of change of the material temperatures, based on heat transfer along the gas path; controlling the flow based on the control signal, such that the boundary conditions are maintained within an operational range; and updating the material temperatures based on the time rates of change, such that the errors in the boundary conditions are minimized. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A turbine comprising:
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a rotor having a plurality of rotor blades extending radially therefrom; a casing positioned about the rotor blades, such that a gas path is formed between the rotor and the casing; a valve actuator for maintaining clearance along the gas path by regulating cooling fluid flow onto the casing; and a controller for directing the valve actuator based on a control signal, the controller comprising; a control module for generating the control signal as a function of a plurality of rotor and casing temperatures defined along the gas path; a plurality of temperature modules for determining time derivatives of the rotor and casing temperatures; a thermodynamic module for modeling boundary conditions for the gas path, based on the rotor and casing temperatures; a comparator for determining errors in the boundary conditions, based on thermodynamic flow constraints; and an estimator for estimating the rotor and casing temperatures based on the time derivatives, such that the errors in the boundary conditions are minimized and the clearance is maintained. - View Dependent Claims (17, 18, 19)
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20. A system comprising:
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a rotary apparatus comprising a rotor and a housing, the rotor and the housing forming a gas path therebetween; a control law for controlling flow along the gas path; and a processor for generating an output to direct the control law, the processor comprising; an output module for generating the output as a function of a plurality of rotor and housing temperatures defined along the gas path; a plurality of temperature modules for determining time derivatives of the rotor and housing temperatures; a thermodynamic module for modeling boundary conditions along the gas path, based on the rotor and housing temperatures; a comparator for determining errors in the boundary conditions; and an estimator for estimating the rotor and housing temperatures based on the time derivatives, such that the errors are minimized and the flow is controlled along the gas path; wherein the output comprises a clearance signal and the control law controls the flow by controlling clearance along the gas path, based on the clearance signal; wherein the function of the rotor and housing temperatures is also a function of a rotational speed of the rotor, such that the output module generates the clearance signal based on the rotor and housing temperatures and a spool speed of the rotary apparatus; and wherein the housing comprises a plurality of stator vanes and the function of the temperature states comprises a coefficient of thermal expansion of the rotor, such that the control signal is based on spacing between the stator vanes and the rotor.
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Specification