Boss --  raised rim around a hole; e.g., axle hole in a wheel. Circular projection on a casting, usually serving as the seat for a bolt head or nut.   Brayton cycle --  constant pressure cycle, with four basic operations which it accomplishes simultaneously and continuously for an uninterrupted flow of power. The turbine engine operates on this cycle. 
 

 
 
飛機發(fā)動機術語英文解釋（C）
 

Camber --  the curvature of an airfoil's surfaces from the chord line. It maybe positive, negative, or zero.   Can-annular combustion chamber --  one with characteristics of both the annular types. It has an outer shell and a number of individual cylindrical liners.   Can combustion chamber --  one made up of individual combustion chambers in which the air from the compressor enters each individual chamber through the adapter.   Center of pressure --  aerodynamic center of an airfoil; the point where all forces act.   Centrifugal axial-flow compressor --  combination of the centrifugal-flow and the axial-flow compressor. It usually consists of a five-or seven-stage axial-flow compressor and one centrifugal-flow compressor. Also called the dual compressor.   Centrifugal-flow compressor --  one with an impeller (rotor), stator, and compressor manifold. The rotor revolves at high speed drawing air into the blades. Centrifugal force accelerates the air, and it moves through the stator and through the manifold.   Centrifugal twisting movement --  force that tends to streamline rotating blades with the plane of rotation.   Choked nozzle --  a nozzle whose flow rate has reached the speed of sound.  
 

Chord line --  imaginary line drawn between the leading and trailing edges of an airfoil.   Combustion --  process of burning the fuel-air mixture in a gas turbine engine.   Combustion chamber --  part of a turbine engine in which the propulsive power is developed by combustion of the injected fuel and the expansive force of the resulting gases.   Combustion chamber liner --  engine part usually constructed of welded high-nickel steel, subjected to flame of extremely high temperature. It is behind the compressor and receives the compressed air which is mixed with fuel and ignited. The combustor is where the combustion takes place.   Compressibility effects --  the phenomenon encountered at extremely high speeds (near the speed of sound) when air ceases to flow smoothly over the wings (or blade) and piles up against the leading edge, causing extreme buffeting and other effects.   Compressor --  that section of an engine that produces an increase in air pressure. It is made up of rotating and stationary vane assemblies. It is the gas producer, or it may be thought of as an air pump.   Compressor rotor --  impeller, may be thought of as an air pump. It accelerates the air rearward into the first stage vane assemblies.   Compressor stall --  separation of the airflow from the suction surface of the freed or rotating blades of a compressor. Any degree of stall reduces airflow.   Concave --  pressure side of an airfoil.   Conduction --  transfer of heat through material by communication of kinetic energy from particle to particle rather than by a flow of heated material.   Convergent area --  place where the cross-sectional area of a duct becomes smaller.