飞机发动机术语英文解释.pdfVIP

飞机发动机术语英文解释（A-B） Acceleration lag -- in the turbine engine, delay between the time instant power is requested and when power is available. The time it takes the engine to accelerate and give the required power increase. Aerodynamic drag -- force which thrust must overcome to move an aircraft forward. Design can lesson aerodynamic drag through streamlining. Drag increases with increased speed. Airbleed actuator -- device that operates the interstage bleed system, to improve compressor acceleration characteristics by unloading small amounts of compressed air. Air density-- total mass of air per given volume, the weight of a given volume of air. Air is denser at lower altitude, at lower temperature, and lower humidity. Airfoil profile -- outline of an airfoil section. Airfoil section -- cross section of an airfoil parallel to a specific reference plane. Air-fuel ratio -- Ideal mixture of 15 parts of air to 1 part of fuel by weight; the mixture to be burned in the combustion chamber. Air inlet -- large, smooth aluminum or magnesium duct at mouth of engine which conducts air into the compressor with minimum turbulence and restriction. Aluminum alloy -- any of a variety of alloys formed by combining commercially pure aluminum with other metals or materials such as copper, silicon, manganese, magnesium, and zinc. These alloying agents maybe added singly or in combination to produce a metal with desired characteristics or strength, heat resistance, corrosion resistance, and the like. Both wrought-and cast-aluminum alloys are widely used in the manufacture of rotor blades and aircraft propellers. Ambient -- condition of atmosphere existing around the engine, such as ambient pressure or temperature. Annular combustion chamber -- two-part combustion chamber made up of an annular liner and a housing assembly. The compressed air goes into a ring-shaped space formed by the annular liner around the turbine shaft rather than into individual