Abstract: A heat shield for protecting a fuel injection tube of a turbine engine afterburner. The heat shield includes a base adapted for attachment to a duct member, the base having a first mounting surface, a first fastener hole, and a recess in the base. A housing encloses the fuel injection tube. The housing has an internal channel for receiving the fuel injection tube, a second mounting surface, a second fastener hole, and a tab protruding from the housing. The tab is sized and shaped for being received in the recess of the base. The housing may be secured to the base at a mounting position wherein the tab is received in the recess, the mounting surfaces are engaged, and the second fastener hole is positioned in registration with the first fastener hole whereby a fastener may be inserted to secure the housing to the base.

Abstract: A mixer assembly for use in a combustion chamber of a gas turbine engine. The assembly includes a pilot mixer and a main mixer. The pilot mixer includes an annular pilot housing having a hollow interior, a pilot fuel nozzle mounted in the housing adapted for dispensing droplets of fuel to the hollow interior of the pilot housing, and a plurality of concentrically mounted axial swirlers positioned upstream from the pilot fuel nozzle. Each of the swirlers has a plurality of vanes for swirling air traveling through the respective swirler to mix air and the droplets of fuel dispensed by the pilot fuel nozzle. The main mixer includes a main housing surrounding the pilot housing defining an annular cavity, a plurality of fuel injection ports for introducing fuel into the cavity, and a swirler positioned upstream from the plurality of fuel injection ports having a plurality of vanes for swirling air traveling through the swirler to mix air and the droplets of fuel dispensed by the fuel injection ports.

Abstract: A collection apparatus for collecting specimens of a predetermined size floating within a body of water comprises a net and a float connected to the net. The net has a mesh surrounded by a periphery. The float has a sufficient buoyancy to maintain the net in a position above the lower surface of the body of water and in a generally stationary attitude relative to the upper surface of the body of water.