Oil cooling system for a gas turbine engine

A fuel delivery and control system for use with a gas turbine engine and a fuel reservoir, said system comprising:

• pump means for drawing fuel from the reservoir and pressurizing means;
• a first heat exchanger in downstream fuel flow communication with said pump means for receiving at least a portion of the pressurized fuel therefrom and further communicating with a source of hot fluid which is maintained in heat exchange relationship with the fuel;
• a fuel control in downstream fuel flow communication with said first heat exchanger for receiving at least a portion of the pressurized fuel therefrom, said fuel control including metering means for scheduling the rate of fuel flow of the engine;
• means for filtering particulate matter from that portion of the pressurized fuel passing through said first heat exchanger;
• by pass valve means responsive to the engine fuel requirements for returning pressurized fuel in excess of engine requirements back to the fuel reservoir whenever the fuel flow upstream of the metering means exceeds the engine requirements;
• and
• divider valve means for receiving the excess pressurized fuel from two locations, one location being upstream of said first heat exchanger and filter means, and the other being downstream of said first heat exchanger and filter means, and for discharging the fuel through the bypass valve means.

A fuel delivery and control system for use with a gas turbine engine and a fuel reservoir, said system comprising:

• pump means communicating with the fuel reservoir for drawing fuel therefrom and pressurizing same;
• a fuel control in downstream flow communication with the pump means for receiving fuel therefrom and including metering means for scheduling the rate of fuel flow to the engine;
• heat exchange means for receiving at least a portion of the pressurized fuel and further communicating with the gas turbine engine for receipt of hot engine oil therefrom, wherein the hot engine oil is maintained in heat exchange relation with the fuel and then returned to the engine at a cooler temperature;
• means for filtering particulate matter from the fuel entering the metering means;
• and
• means for maintaining the temperature of the fuel entering the filter means above a minimum level.

A fuel delivery system comprising:

• a first fuel-oil heat exchanger;
• a second fuel-oil heat exchanger in downstream fuel flow communication with said first heat exchanger;
• a first oil cooling circuit comprising, in sequential oil flow communication, an oil supply, a first oil-lubricated system, said second heat exchanger, and means for returning the oil to said oil supply;
• and
• a second oil cooling circuit comprising, in sequential oil flow communication, said oil supply, said first heat exchanger, a second oil-lubricated system, said second heat exchanger and said return means.

A fuel delivery system comprising:

• a first fuel-oil heat exchanger;
• a second fuel-oil heat exchanger in downstream fuel flow communication with said first heat exchanger;
• a first oil cooling circuit comprising, in sequential oil flow communication, an oil supply, said first heat exchanger, said first oil-lubricated system and means for returning the oil to said oil supply;
• and
• a second oil cooling circuit comprising, in sequential oil flow communication, said oil supply, a second oil-lubricated system, said second heat exchanger and said return means.

A fuel delivery and control system for use with a gas turbine engine and a fuel reservoir, said system comprising:

• pump means communicating with the fuel reservoir for drawing fuel therefrom and pressurizing same;
• a fuel control in downstream flow communication with the pump means for receiving fuel therefrom, said fuel control including metering means for scheduling the rate of fuel flow to the engine;
• a heat exchanger for receiving all of the metered fuel and further communicating with a source of hot fluid which is maintained in heat exchange relation with the fuel;
• and
• means for returning all fuel in excess of engine requirements back to the fuel reservoir.