時間：2011-03-11 23:11來源：藍(lán)天飛行翻譯 作者：admin 點擊：次
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The amount of current flowing in a thermocouple is determined by the difference in the temperature of the two junctions: the cold, or reference, junction, and the hot, or measuring, junction. cold light. Light that has little or no radiation in the infrared range. Cold light produces almost no heat. cold-rolled steel. Low-carbon steel that has been passed through rollers while it was cold. Cold rolling reduces the thickness of the steel, makes it both harder and stronger, and gives it a smooth surface. cold section (gas turbine engine). The portion of a gas turbine engine ahead of the combustion section. The cold section includes the inlet duct or ducts, compressor, and diffuser. cold-solder joint (electrical wiring). A soldered connection in electrical wiring in which the wires were moved before the solder solidified. A cold-solder joint has a granular appearance, little physical strength, and a high electrical resistance. Cold-solder joints are undesirable and must be reheated to melt the solder. The solder must then be allowed to solidify completely before the joint is moved. cold spark plug. A spark plug with a short path for the heat to travel between the nose core insulator and the shell. A cold spark plug carries the heat away from the nose core, so it can operate in a high-compression engine without the nose core becoming too hot. Too hot a nose core can cause preignition in the cylinder. cold stream (gas turbine engine). The British term for the fan discharge in a turbofan engine. cold-tank lubrication system (gas turbine engine lubrication system). A turbine engine lubricating system in which the oil cooler is in the scavenge subsystem. The oil leaves the engine, passes through the cooler, and then goes into the supply tank. cold weld. Fusion between two pieces of metal obtained by pressure without the application of external heat. cold working (metalworking). A method of increasing the strength and hardness of metal without the use of external heat. Cold working is done by hammering the metal, bending it back and forth, or pulling it through dies. coleopter. A concept of a flying machine in which the wing is built in the form of a venturi tube. The engine and propeller are mounted inside the tube-shaped wing. collar. A ring, or round flange, made as a part of a shaft or installed on it to either restrain movement or hold something in place. collective pitch control (helicopters). The flight control of a helicopter that changes the pitch of all the rotor blades at the same time. Movement of the collective control increases or decreases the lift produced by the entire rotor disk. collector (transistor electrode). The electrode in a bipolar transistor from which conventional current leaves the transistor. The collector is the electrode in the transistor symbol on the same side of the base line as the emitter, but it does not have the arrowhead. collector ring (electrical equipment). Rings mounted on the rotor shaft of an electrical machine to carry current into and out of the rotating winding. |
