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An apparatus includes a thermoelectric (TE) device, a gas flow conduit proximate to one side of the thermoelectric device, a plurality of flexible tubes proximate to a second side of the thermoelectric device, and a spring to control contact force between the flexible tubes and the thermoelectric de

An apparatus includes a thermoelectric (TE) device, a gas flow conduit proximate to one side of the thermoelectric device, a plurality of flexible tubes proximate to a second side of the thermoelectric device, and a spring to control contact force between the flexible tubes and the thermoelectric device. The spring comprises a coil spring at least partially circumscribing the gas flow conduit. The thermoelectric device converts a temperature differential between the flexible tubes and the gas flow conduit into electrical energy.

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1. An apparatus comprising: a thermoelectric (TE) device;a combustion gas flow conduit proximate to one side of the thermoelectric device;a plurality of flexible tubes proximate to a second side of the thermoelectric device; anda spring to control contact force between the flexible tubes and the the

1. An apparatus comprising: a thermoelectric (TE) device;a combustion gas flow conduit proximate to one side of the thermoelectric device;a plurality of flexible tubes proximate to a second side of the thermoelectric device; anda spring to control contact force between the flexible tubes and the thermoelectric device, wherein the spring comprises a coil spring circumscribing the combustion gas flow conduit;wherein the thermoelectric device converts a temperature differential between the flexible tubes and the combustion gas flow conduit into electrical energy. 2. The apparatus of claim 1 wherein a fuel flows through the flexible tubes and thereby cools the flexible tubes. 3. The apparatus of claim 1 wherein the combustion gas flow conduit further comprises a ceramic matrix composite. 4. The apparatus of claim 1, wherein the combustion gas flow conduit is formed in a generally annular shape; andwherein the coil spring is arranged substantially circumferentially with respect to the combustion gas flow conduit. 5. The apparatus of claim 4, wherein each of the flexible tubes extends between a first and a second end of the combustion gas flow conduit; andwherein at least one of the first and the second ends of each of the flexible tubes is connected to an annular manifold configured to carry a fluid. 6. The apparatus of claim 1, wherein the combustion gas flow conduit is formed in a generally rectangular cross-sectional shape, andwherein the spring substantially surrounds the flexible fuel-cooled tubes. 7. The apparatus of claim 1, wherein each of the flexible tubes extends between a first and a second end of the combustion gas flow conduit; andwherein at least one of the first and the second ends of each of the flexible tubes is connected to a manifold configured to carry a fluid. 8. The apparatus of claim 1, wherein the spring is configured to apply a load on the TE device of approximately 140 to 350 kPa (20 to 50 psi). 9. The apparatus of claim 1, wherein the spring is a canted coil spring. 10. A ramjet comprising: a conduit assembly surrounding a gas flow path of the ramjet, the conduit assembly comprising: a gas flow conduit arranged adjacent the gas flow path;a plurality of flexible tubes configured to be cooled by a fuel flowable therethrough;a thermoelectric (TE) device, for converting a thermal energy differential into electrical energy, arranged between the gas flow conduit and the flexible tubes; anda coil spring configured to bias the TE device into contact with the gas flow conduit and the flexible tubes, wherein the coil spring at least partially circumscribes the gas flow path;a combustor arranged aftward of the conduit assembly; andan outlet conduit arranged aftward of the combustor. 11. The ramjet of claim 10, wherein the gas flow conduit, the TE device, and the flexible tubes are formed in a generally annular shape in a direction substantially perpendicular to the gas flow path; andwherein the coil spring is arranged substantially circumferentially with respect to the gas flow path. 12. The ramjet of claim 10, wherein each of the flexible tubes extends between a first and a second end of the conduit; andwherein one or both of the first and the second ends of each of the flexible tubes is connected to an annular manifold configured to carry the fuel. 13. The ramjet of claim 10, wherein the gas flow conduit comprises a ceramic matrix composite material. 14. The ramjet of claim 13, wherein the gas flow conduit, the TE device, and the flexible tubes are formed in a generally rectangular cross-sectional shape in a direction substantially perpendicular to the gas flow path;wherein the coil spring substantially surrounds the flexible tubes;wherein each of the flexible tubes extends between a first and a second end of the conduit; andwherein one or both of the first and the second ends of each of the flexible tubes is connected to a manifold configured to carry the fuel. 15. The ramjet of claim 10, wherein the coil spring is configured to apply a load on the TE device of approximately 140 to 350 kPa (20 to 50 psi). 16. The ramjet of claim 10, wherein the coil spring is a canted coil spring. 17. The ramjet of claim 10 and further comprising one or more additional coil springs spaced apart from one another. 18. A vehicle comprising: a fuselage; andan engine connected to the fuselage and comprising a conduit assembly surrounding a gas flow path of the engine, wherein the conduit assembly comprises: a gas flow conduit arranged adjacent the gas flow path;a plurality of flexible tubes configured to be cooled by a fuel flowable therethrough;a manifold connected in fluid communication with each of the plurality of flexible tubes;a thermoelectric (TE) device configured to convert a thermal differential into electrical energy and arranged between the gas flow conduit and the flexible tubes; anda canted coil spring configured to circumscribe the gas flow path and bias the TE device into contact with the gas flow conduit and the flexible tubes. 19. The vehicle of claim 18, wherein the gas flow conduit comprises a ceramic matrix composite material. 20. The vehicle of claim 18, wherein each of the flexible tubes extends between a first and a second end of the pas flow conduit; andwherein the manifold is annular in shape. 21. The vehicle of claim 18, wherein the gas flow conduit, the TE device, and the flexible fuel-cooled tubes are formed in a generally rectangular cross-sectional shape in a direction substantially perpendicular to the gas flow path. 22. The vehicle of claim 18, wherein the canted coil spring is configured to apply a load on the TE device of approximately 140 to 350 kPa (20 to 50 psi). 23. The vehicle of claim 18 and further comprising one or more additional canted coil springs axially spaced from one another.