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An apparatus for controlling a fluid flow is disclosed herein. The apparatus includes first and second spaced walls defining opposite sides of a first fluid passageway extending along a first axis. At least one of the first and second walls is cantilevered along the first axis and includes a distal

An apparatus for controlling a fluid flow is disclosed herein. The apparatus includes first and second spaced walls defining opposite sides of a first fluid passageway extending along a first axis. At least one of the first and second walls is cantilevered along the first axis and includes a distal end moveable relative to the first axis. The distal end of the at least one wall is moveable in response to changes in the flow temperature to passively vary a size of the first fluid passageway.

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1. An apparatus for controlling a fluid flow comprising: first and second spaced walls defining opposite sides of a first fluid passageway extending along a first axis, wherein at least one of said first and second walls is cantilevered along said first axis and includes a distal end moveable relati

1. An apparatus for controlling a fluid flow comprising: first and second spaced walls defining opposite sides of a first fluid passageway extending along a first axis, wherein at least one of said first and second walls is cantilevered along said first axis and includes a distal end moveable relative to said first axis in response to changes in the flow temperature to passively vary a size of said first fluid passageway; andat least one slot defined in said distal end, said at least one slot extending along a slot axis being transverse to and spaced from said first axis. 2. The apparatus of claim 1 wherein both of said first and second walls are arcuate in a plane containing said first axis and said first fluid passageway is at least partially annular. 3. The apparatus of claim 1 wherein both of said first and second walls are cantilevered with respective first and second distal ends that are individually moveable relative to said first axis in response to changes in the flow temperature to vary a size of said first fluid passageway. 4. The apparatus of claim 3 wherein said first and second distal ends move closer to one another in response to increasing flow temperature. 5. The apparatus of claim 1 wherein said at least one of said first and second walls further comprises: a first layer having a first coefficient of thermal expansion; anda second layer bonded to said first layer and having a second coefficient of thermal expansion greater than the first coefficient of thermal expansion. 6. The apparatus of claim 5 wherein said second layer is positioned outside of said first fluid passageway. 7. The apparatus of claim 5 wherein both of said first and second walls include respective first and second layers. 8. The apparatus of claim 7 wherein said second layer of said first wall and said second layer of said second wall are positioned outside of said first fluid passageway. 9. The apparatus of claim 1 wherein said first fluid passageway defines a flow area that is linearly related to the flow temperature. 10. The apparatus of claim 1 further comprising: a third wall spaced from both of said first and second walls such that said third wall and one of said first and second walls define opposite sides of a second fluid passageway extending along a second axis. 11. The apparatus of claim 10 wherein said second wall is cantilevered and wherein said second and third walls define opposite sides of said second fluid passageway, said distal end of said second wall moveable relative to both of said first and second axes in response to changes in the flow temperature to inversely vary sizes of both of said first and second fluid passageways. 12. The apparatus of claim 1 further comprising: a structure operable to extract energy from the flow of fluid in said first fluid passageway, wherein said at least one of said first and second walls is moveable relative to said first axis in response to changes in the flow temperature to seal against said structure. 13. A method for controlling a fluid flow comprising the steps of: defining opposite sides of a first fluid passageway extending along an first axis with first and second spaced walls;extending at least one of the first and second walls to be cantilevered along the first axis, wherein the at least one cantilevered wall includes a distal end moveable relative to the first axis in response to changes in the flow temperature to passively vary a size of the first fluid passageway; anddiverting more fluid flow into a second fluid passageway by passively and inversely adjusting the respective back pressures in the first and second fluid passageways. 14. The method of claim 13 further comprising the steps of: forming the at least one cantilevered wall from a plurality of materials having different coefficients of thermal expansion such that the at least one cantilevered wall bends in response to changes in the temperature. 15. The method of claim 13 further comprising the steps of: defining at least part of a second fluid passageway with the at least one cantilevered wall such that variations in the size of the first fluid passageway inversely vary the size of the second fluid passageway. 16. A turbine engine comprising: first and second spaced walls defining opposite sides of a first fluid passageway extending along a first axis, wherein at least one of said first and second walls is cantilevered along said first axis and includes a distal end moveable relative to said first axis in response to changes in the flow temperature to passively vary a size of said first fluid passageway; anda structure operable to extract energy from the flow of fluid in said first fluid passageway, wherein said at least one of said first and second walls is moveable relative to said first axis in response to changes in the flow temperature to seal against said structure. 17. The turbine engine of clam 16 further comprising: a third wall radially spaced from said first and second walls relative to said centerline axis, wherein a second fluid passageway adjacent to said first fluid passageway is defined in part between said first and third walls.