US Patent 10378446 Thermal management for injectors

An injector for a gas turbine engine includes a feed arm including a primary and a secondary fluid passage. An inlet assembly is fixed at an upstream end of the feed arm having at least one inlet in fluid communication with the primary and the secondary fluid passages. A tip assembly is fixed at a downstream end of the feed arm having a fluid outlet in communication with the primary and secondary fluid passages for issuing a spray of fluid. The primary and secondary fluid passages are monolithically formed within the feed arm. At least one of the primary and secondary fluid passages includes a nonlinear section configured to provide increased residence time for cooling fluid in the first and second fluid passages.