时间:2011-06-12 10:48来源:蓝天飞行翻译 作者:航空 点击:次
Splines -- teeth in a gear. Stable operation -- condition where no appreciable fluctuation, intentional or unintentional, is occurring to any of the engine's variables such as RPM, temperature, or pressure. Standard day conditions -- 59o F, sea level barometric pressure (29.92 inches of mercury). Static-balanced surface -- surface that is in balance about its hinge axis. Stator -- part of assembly that remains stationary with respect to a rotating part. Stator vanes are a stationary set of airfoils in a compressor. Stress -- resultant condition of strain or pressure.
Tachometer generator -- device that supplies power at a frequency proportional to the driven speed which drives the synchronous motors in the indicator. TBO -- time between overhauls. This is established by the Army and the engine manufacturer. Test cell -- building, usually concrete, that contains both a control room and an engine room, used for testing engines. The test cell is at the manufacturer's; a mobile engine-test unit is used in the field. Thermodynamic cycle -- succession of processes which involve changes in temperature, pressure, and density in which the substance acts as a means of transformation of energy. See Otto and Brayton cycles. Thrust -- a reaction force in pounds.
Thrust, gross -- the thrust developed by the engine, not taking into consideration any presence of initial-air-mass momentum. Thrust, net -- the effective thrust developed by the engine during flight, taking into consideration the initial momentum of the air mass prior to entering the influence of the engine. Thrust, reverser -- a device used to partially reverse the flow of the engine's nozzle discharge gases and thus create a thrust force in the rearward direction. Thrust, specific fuel consumption -- the fuel that the engine must burn per hour to generate 1 pound of thrust. Thrust, static -- same as gross thrust without any initial airmass momentum present due to the engine's static condition. Torque -- a force, multiplied by its lever arm, acting at right angles to an axis. Torquemeter -- hydromechanical torque-measuring device located in the reduction-gear section of the inlet housing. The measurement is read as torque oil pressure in psi. Torquemeter indicating system -- pressure indicator for continuous readings of engine output-shaft torque. Transient conditions -- conditions which may occur briefly while accelerating or decelerating or while passing through a specific range of engine operation. Turbine nozzle -- stationary nozzle which discharges a jet of gas against the blades on the periphery of a turbine wheel. Turbine rotor -- rotating portion of a turbine engine. It is made of specially alloyed steel because of severe centrifugal loads, the result of high rotational speeds. Turbine section -- |