DETERMINING AND CONTROLLING A WEIGHT FLOW IN AN ENVIRONMENTAL CONTROL SYSTEM
First Claim
1. A method comprising:
- sensing a turbine inlet temperature of air flow at an inlet of a turbine;
sensing a turbine inlet pressure of the air flow at the inlet of the turbine;
sensing a turbine outlet pressure of the air flow at an outlet of the turbine;
sensing a rotational speed of a rotor of the turbine;
receiving, by a controller including processing circuitry and computer-readable memory, the sensed turbine inlet temperature, the sensed turbine inlet pressure, the sensed turbine outlet pressure, and the sensed rotational shaft speed;
determining, by the controller, a flow coefficient using the turbine inlet pressure, the turbine outlet pressure, the rotational speed, and a turbine flow coefficient map;
determining, by the controller, a weight flow through the turbine using the flow coefficient, the turbine inlet temperature, a turbine inlet nozzle area, and the turbine inlet pressure; and
providing, by the controller, an output signal based on the weight flow.
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Abstract
A method of determining and controlling a weight flow in an environmental control system includes sensing, using a turbine inlet temperature sensor, a turbine inlet temperature. A turbine inlet pressure is sensed using a turbine inlet pressure sensor. A turbine outlet pressure is sensed using a turbine outlet pressure sensor. A rotational shaft speed of a shaft is sensed using a rotational shaft speed sensor. The sensed turbine inlet temperature, the sensed turbine inlet pressure, the sensed turbine outlet pressure, and the sensed rotational shaft speed are received by a controller. A flow coefficient is determined by the controller using the turbine inlet pressure, the turbine outlet pressure, the shaft speed, and a Turbine Flow Coefficient Map. A weight flow through the turbine is determined by the controller using the flow coefficient, the turbine inlet temperature, a nozzle area, and the turbine inlet pressure.
11 Citations
19 Claims
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1. A method comprising:
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sensing a turbine inlet temperature of air flow at an inlet of a turbine; sensing a turbine inlet pressure of the air flow at the inlet of the turbine; sensing a turbine outlet pressure of the air flow at an outlet of the turbine; sensing a rotational speed of a rotor of the turbine; receiving, by a controller including processing circuitry and computer-readable memory, the sensed turbine inlet temperature, the sensed turbine inlet pressure, the sensed turbine outlet pressure, and the sensed rotational shaft speed; determining, by the controller, a flow coefficient using the turbine inlet pressure, the turbine outlet pressure, the rotational speed, and a turbine flow coefficient map; determining, by the controller, a weight flow through the turbine using the flow coefficient, the turbine inlet temperature, a turbine inlet nozzle area, and the turbine inlet pressure; and providing, by the controller, an output signal based on the weight flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An environmental control system comprising:
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a turbine that includes a turbine inlet, a turbine outlet, and a rotor; a turbine inlet temperature sensor located upstream of the turbine, which provides a signal representative of turbine inlet temperature; a turbine inlet pressure sensor located upstream of the turbine, which provides a signal representative of turbine inlet pressure; a turbine outlet pressure sensor located downstream of the turbine, which provides a signal representative of turbine outlet pressure; a rotational speed sensor, which provides a signal representative of rotational speed of the rotor; and a controller that determines weight flow through the turbine as a function of a flow coefficient, a turbine inlet nozzle area, the turbine inlet pressure, and the turbine inlet temperature, according to the following equation; - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification