Abstract: A heat exchanger includes a first plate defining a first plurality of undulations that extend along a first axis and a second axis, and a second plate defining a second plurality of undulations. The second plate is spaced apart from and coupled to the first plate to define a first fluid flow passage. A first flow area of the first fluid flow passage is constant from a first inlet to a first outlet. The heat exchanger includes a third plate defining a third plurality of undulations. The third plate is spaced apart from and coupled to the second plate to define a second fluid flow passage. The second fluid flow passage is discrete from the first fluid flow passage. A second flow area of the second fluid flow passage is constant from a second inlet to a second outlet.

Abstract: A surface type air to oil cooler enables oil to flow from an inlet and down a first pass of an oil passageway. A first bypass, before the end of the first pass, allows oil to flow from the first pass to a second pass of the oil passageway. A second bypass may exist toward the end of the second pass to allow the oil to flow from the second pass to an outlet before the end of the second pass.

Abstract: The present invention relates to apparatus and methods for exchanging heat between various fluids. More particularly, the present invention relates to apparatus and methods for exchanging heat between fuel, fan-air, and bleed-air in an integrated heat exchanger. Thereby, a weight and size of the integral heat exchanger are reduced compared to known non-integral heat exchangers. Advantageously, the heat exchanger may heat fuel to improve engine specific fuel consumption (SFC).

Abstract: A surface type air to oil cooler enables oil to flow from an inlet and down a first pass of an oil passageway. A first bypass, before the end of the first pass, allows oil to flow from the first pass to a second pass of the oil passageway. A second bypass may exist toward the end of the second pass to allow the oil to flow from the second pass to an outlet before the end of the second pass.

Abstract: The present invention relates to apparatus and methods for exchanging heat between various fluids. More particularly, the present invention relates to apparatus and methods for exchanging heat between fuel, fan-air, and bleed-air in an integrated heat exchanger. Thereby, a weight and size of the integral heat exchanger are reduced compared to known non-integral heat exchangers. Advantageously, the heat exchanger may heat fuel to improve engine specific fuel consumption (SFC).

Abstract: An improved foil thrust bearing includes a cooling fluid flow turbulence generating disk placed between other foil thrust bearing elements, such as thrust bearing elements and underspring elements. The inventive turbulence generating disk generally provides improved transfer of heat through the foil and into the cooling fluid of foil thrust bearings that may be used for high rotor speed applications. It accomplishes this by improving the transfer of heat through the foil and into the cooling fluid by generating turbulent cooling flow adjacent to the back of the top foil. The turbulent flow is generated primarily by a series of turns or protrusions introduced into the cooling flow stream. Alternate embodiments are disclosed that provide the turbulence generating elements as part of the underside of thrust bearing elements.

Abstract: An improved foil thrust bearing includes a cooling fluid flow turbulence generating disk placed between other foil thrust bearing elements, such as thrust bearing elements and underspring elements. The inventive turbulence generating disk generally provides improved transfer of heat through the foil and into the cooling fluid of foil thrust bearings that may be used for high rotor speed applications. It accomplishes this by improving the transfer of heat through the foil and into the cooling fluid by generating turbulent cooling flow adjacent to the back of the top foil. The turbulent flow is generated primarily by a series of turns or protrusions introduced into the cooling flow stream. Alternate embodiments are disclosed that provide the turbulence generating elements as part of the underside of thrust bearing elements.