时间:2011-06-12 10:48来源:蓝天飞行翻译 作者:航空 点击:次
Convergent exhaust duct -- duct used on fixed-wing aircraft; formed by tapering toward the rear of the duct. Convex -- suction side of an airfoil. Crossover tube -- duct carrying flame to the individual cylindrical liners of the can-annular combustion chamber.
Diffuser -- aft structural member of an engine. It receives high velocity air from the centrifugal impeller and decreases velocity and increases air pressure. In the combustor, a diffuser forms a divergent flow path for the exhaust gases. Diffusion -- process by which gases intermingle as the result of their spontaneous movement caused by thermal agitation. Directional references -- specific definitions of terms referring to gas turbine engines to identify front and rear, right and left, bottom and top. Divergent area -- place where air flows from a smaller into a larger area. Divergent exhaust duct -- used on helicopter. Device to diffuse the exhaust gases rearward and to eliminate thrust. Drag parasite -- drag caused by any member or structure which does not contribute to lift, such as engine cowlings. Drag profile -- friction resistance produced by a member moving through the air; in simple terms, the "stickness" of air against the surface of an airfoil. Dry-cleaning solvent --
cleaning compound that maybe used for all metal parts. Dry-sump engine -- one in which the oil is stored separate from the engine. Dual compressor -- see centrifugal-flow, axial-flow compressor. Duplex nozzle -- dual-orifice channel through which highly atomized and accurately shaped sprays of fuel go into the combustion chamber. Dynamic load -- load on an aircraft due to a dynamic force.
Effective angle of attack -- that part of a given angle of attack that lies between the chord of an airfoil and a line representing the resultant velocity of the disturber airflow. End play -- longitudinal back-and-forth play of a shaft. Engine airflow path -- route of the airflow through the engine. Engine oil pressure indicating system -- device that gives continuous readings of engine oil pump pressure in psi. Engine oil temperature indicating system -- device electrically connected to the 28 VDC system which transmits temperature readings to the indicator in degrees centigrade. Engine speed notation -- the capital letter N, which represents the rotational speed of the engine. When a number is placed after the N (as in "N1"), it indicates a specific system on the engine. Engine stations -- specific locations on the engine designating temperature or pressure-measuring locations. For example, T3 means the third temperature pickup on the engine. |