Abstract: A noise attenuation device for testing a jet engine.

Abstract: A noise attenuation device for use in a jet engine test cell for testing a jet engine comprising a carbon steel pipe which is aligned axially with direction of exhaust from the jet engine. The carbon steel pipe is positioned within an augmenter within the test cell. Cold air enters the front end of the carbon-steel pipe. Adding three times the mass of cold air to that of the hot jet exhaust allows the hot jet exhaust to mix with the cold air forming an engine exhaust-cool air mixture. When the engine exhaust-cool air mixture reaches the outlet end of the carbon steel pipe, its temperature is reduced from 3800° F. to less than 1200° F., which substantially reduces noise generated by the jet exhaust. Located in proximity to the rear end of the carbon steel pipe is an annular region which is formed between perforated side plates within the carbon steel pipe and the inner wall of the augmenter. The flow is diffused as the flow area expands in the annular region.

Abstract: Reaction turbine and pump apparatus includes:(a) a first nozzle or nozzles to receive heated fluid for expansion therein to form a two-phase discharge of gas and liquid,(b) a separator rotor having an axis and a rotating surface located in the path of said discharge for supporting a layer of separated liquid on said surface,(c) the rotor having a reaction nozzle or nozzles to communicate with said layer to receive liquid therefrom for discharge in a direction or directions developing torque acting to rotate the rotor,(d) and a pump associated with and driven by the rotor, the pump including an annular rim surface to receive impingement of liquid to be pumped, the liquid collecting as a rotating ring on the rim surface.In addition, the rim surface may be integral with the separator rotor; and the heated fluid may consist of a low vapor pressure fluid component which remains liquid and a high vapor pressure fluid component which at least partially vaporizes in the first nozzle or nozzles.