Gas turbine engine thermal management system

Abstract

A thermal management system according to an exemplary aspect of the present disclosure includes, among other things, a first fluid circuit that selectively communicates a first portion of a first conditioned fluid having a first temperature to a first gas turbine engine system and a second portion of the first conditioned fluid having a second temperature to a second gas turbine engine system. The second temperature is a greater temperature than the first temperature. A second fluid circuit circulates a second conditioned fluid that is different from the first conditioned fluid to a third gas turbine engine system.

What is claimed is: 
     
         1 . A thermal management system, comprising:
 a first fluid circuit that selectively communicates a first portion of a first conditioned fluid having a first temperature to a first gas turbine engine system and a second portion of said first conditioned fluid having a second temperature to a second gas turbine engine system, wherein said second temperature is a greater temperature than said first temperature; and   a second fluid circuit that circulates a second conditioned fluid that is different from said first conditioned fluid to a third gas turbine engine system.   
     
     
         2 . The system as recited in  claim 1 , wherein said first fluid circuit circulates oil and said second fluid circuit circulates fuel. 
     
     
         3 . The system as recited in  claim 1 , wherein said first gas turbine engine system is a first portion of a geared architecture of a fan section, said second gas turbine engine system is a second, different portion of said geared architecture, and said third gas turbine engine system is a combustor. 
     
     
         4 . The system as recited in  claim 1 , wherein said first fluid circuit incorporates a first heat exchanger, a second heat exchanger and a third heat exchanger and said second fluid circuit incorporates said second heat exchanger. 
     
     
         5 . The system as recited in  claim 4 , comprising a bypass passage extending between said first heat exchanger and said second engine system. 
     
     
         6 . The system as recited in  claim 4 , comprising a sensor that senses a temperature of said second conditioned fluid and a controller in communication with said sensor and operable to modulate a valve when said temperature of said second conditioned fluid exceeds a predefined threshold, wherein a portion of said first conditioned fluid is communicated to said third heat exchanger only in response to said second conditioned fluid exceeding said predefined threshold. 
     
     
         7 . The system as recited in  claim 1 , wherein said first conditioned fluid is a mixed conditioned fluid that combines a second conditioned fluid and a third conditioned fluid from separate heat exchangers incorporated into said first fluid circuit. 
     
     
         8 . The system as recited in  claim 1 , wherein said first fluid circuit includes a first heat exchanger and a second heat exchanger, wherein said first heat exchanger exchanges heat between said first conditioned fluid and said second conditioned fluid and said second heat exchanger exchanges heat between said first conditioned fluid and another fluid. 
     
     
         9 . The system as recited in  claim 1 , wherein said first fluid circuit includes a first heat exchanger, a second heat exchanger and a third heat exchanger, said first fluid circuit configured so that:
 a conditioned fluid exits said first heat exchanger;   a first portion of said conditioned fluid from said first heat exchanger selectively enters said second heat exchanger; and   a second portion of said conditioned fluid from said first heat exchanger selectively enters said third heat exchanger.   
     
     
         10 . The system as recited in  claim 9 , wherein fluid exiting said second and third heat exchangers combine to form said first conditioned fluid. 
     
     
         11 . A thermal management system, comprising:
 a first fluid circuit that selectively communicates a first portion of a conditioned oil having a first temperature to a first portion of a geared architecture of a fan section of a gas turbine engine and a mixture including a second portion of said conditioned oil and said first portion of said conditioned oil or another fluid that includes a second temperature to a second, different portion of said geared architecture, wherein said second temperature is a greater temperature than said first temperature; and   a second fluid circuit that circulates a conditioned fuel to a combustor of said gas turbine engine, wherein said conditioned fuel exchanges heat with said conditioned oil prior to communication to said combustor.   
     
     
         12 . The system as recited in  claim 11 , wherein said mixture includes said second portion of said conditioned oil and said another fluid. 
     
     
         13 . The system as recited in  claim 11 , wherein said first fluid circuit includes a first heat exchanger, a second heat exchanger and a third heat exchanger, said first fluid circuit configured so that:
 a conditioned fluid exits said first heat exchanger;   a first portion of said conditioned fluid from said first heat exchanger selectively enters said second heat exchanger; and   a second portion of said conditioned fluid from said first heat exchanger selectively enters said third heat exchanger.   
     
     
         14 . The system as recited in  claim 13 , wherein fluid exiting said second and third heat exchangers combine to form said conditioned oil. 
     
     
         15 . The system as recited in  claim 13 , wherein said second heat exchanger is incorporated into said second fluid circuit such that said first portion of said conditioned fluid from said first heat exchanger that enters said second heat exchanger exchanges heat with a fuel to provide said conditioned fuel.