Air turbine with power controller having operation independent of temperature

A fluid driven turbine for use in generating power by driving a load with a fluid stream intercepting blades of the turbine and the turbine applying power to the load during rotation of the blades comprising:

• a variable displacement hydraulic pump which is driven by rotation of the blades, including a displacement control having an element which is responsive to a hydraulic control signal for varying the displacement of the variable displacement hydraulic pump for rotational velocities of the blades for producing a pressurized hydraulic fluid output;
• and
• a hydraulic control valve which generates the control signal in response to a hydraulic signal which is a function of speed changes of the blades and a pressure dropping orifice, responsive to the hydraulic signal which is a function of speed changes of the blades which bleeds the hydraulic signal to a lower pressure, the orifice producing a coefficient of discharge of liquid independent of viscosity thereof;
• and wherein
• the control signal causes the element to vary displacement of the variable displacement pump as a function of to speed changes of the blades.

A RAM air turbine for use in generating power in an airplane by driving a load with a RAM airstream intercepting blades of the turbine with the turbine and the turbine applying power to the load during rotation of the blades comprising:

• a variable displacement hydraulic pump which is driven by rotation of the blades, including a displacement control having an element which is responsive to a hydraulic control signal for varying the displacement of the variable displacement hydraulic pump for rotational velocities of the blades, for producing a pressurized hydraulic fluid output to drive a hydraulic load;
• and
• a hydraulic control valve which generates the control signal in response to a hydraulic signal which is a function of speed changes of the blades and a pressure dropping orifice, responsive to the hydraulic signal which is a function of speed changes of the blades which bleeds the hydraulic signal to a lower pressure, the orifice producing a coefficient of discharge of liquid independent of viscosity thereof;
• and wherein
• the control signal causes the element to vary displacement of the variable displacement pump which is a function of speed changes of the blades.