| 摘要 |
A fuel injector for a gas turbine engine includes an elongated primary fuel tube residing within an elongated secondary fuel tube. The primary fuel tube is brazed or otherwise metallurgically joined to the injector housing proximate opposite end regions of the primary fuel tube. Between the end regions, the primary fuel tube includes a spiral configuration or profile that engages the inner wall of the secondary fuel tube in line-to-line interference contact along a sufficient portion of the lengths of the primary and secondary fuel tubes effective to reduce thermal and vibration stresses on the primary fuel tube and essentially eliminate fatigue failure at the brazed end regions and to increase its axial compliance, thereby lowering internal stresses imparted by a given thermal strain caused by rigid attachment of the relatively cool primary tube to the relatively hot support housing.
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