BED TESTING TURBOJET ENGINE WITH ROTARY AXIALLY SYMMETRIC THRUST NOZZLE Russian patent published in 2000 - IPC

FIELD: testing of turbojet engines. SUBSTANCE: given bed is designed to test turbojet engines with rotary axially symmetric thrust nozzle. It allows nozzle to be turned in one or all possible orientation planes in space. Bed includes device to anchor tested turbojet engine and exhaust device with ejector mounted on frame installed across outlet. Wall of internal duct of ejector in area of its vertical plane is provided with cooling ducts directed along longitudinal axis of ejector. Cross- section of circuit of internal duct of ejector is elliptical with its minor axis being located in area of horizontal plane. Wall of internal duct of ejector and its cooling ducts are formed in area of vertical plane by two rows of longitudinal tubes as minimum. In cross-section both rows of tubes are positioned along elliptical circuit of internal duct of ejector. In this case tubes of second row contact tubes of internal row and are circularly displaced by half-pitch relative to them. Cooling ends of tubes are connected to water source. Such design of bed makes it feasible to ensure its high operational reliability under all conditions of operation of turbojet engine with thrust vector variable in space, especially if afterburner functions without any restrictions both in time and in angles of turn of thrust nozzle. EFFECT: high operational reliability of bed. 4 cl, 12 dwg