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航空术语词典Dictionary of Aeronautical Terms 下

时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:


triode electron tube. An electron tube with three active electrodes: the cathode, the control grid, and the anode, or plate. Triode electron tubes are used as amplifiers. A small change in voltage between the cathode and the control grid controls a large flow of electrons between the cathode and the anode. Triode electron tubes have, to a large extent, been replaced by the much smaller and more efficient bipolar transistors.
trip-free circuit breaker (electrical component). A circuit breaker that opens a circuit any time an excessive amount of current flows, regardless of the position of the circuit breaker’s operating handle. A trip-free circuit breaker cannot be closed into an active electrical fault.
triphibian (aircraft type). An aircraft with a landing gear that allows it to operate from dry ground, snow or ice, or water.
triplane (type of airplane). An airplane with three main supporting wings. Triplanes were used during World War I because they were strong and lightweight, and their short wing span made them highly maneuverable. The additional expense and the drag produced by the third wing caused them to lose in popularity to the biplane and later to the monoplane.
triple-slotted flap (airplane secondary control). A type of trailing-edge wing flap used on some of the larger, high-performance airplanes. Triple-slotted flaps extend from the trailing edge of a wing in three sections. The trailing edge of one section forms a duct with the leading edge of the section behind it to force air down over the top of the flap. Triple-slotted flaps prevent the airflow from separating from the surface of the flap when they are fully extended.

triple-spool engine (gas turbine engine). A type of turbofan engine in which the fan is the first stage of compression, or N1. The normal low-pressure compressor is N2, and the high-pressure compressor is N3. Each stage of compressor is driven by its own turbine, and the N3 compressor is the only one whose speed is governed by the fuel control. The N1 and N2 compressors rotate at their own best speed.
triple thread. A multiple screw thread in which three threads are cut parallel to each other. The starting point of each thread is 120° from the starting point of the others. The lead, or the distance the screw moves forward in one revolution, is three times the pitch (the distance between the threads adjacent to each other).
tritium. An isotope of hydrogen with an atomic weight of three. The nucleus of an isotope of tritium has two neutrons as well as the proton. A normal atom of hydrogen has only one proton and no neutrons in its nucleus.
trivalent element. A chemical element with three electrons in its valence, or outer, shell. Boron, aluminum, gallium, and indium are trivalent elements.
tropical air (meteorology). An air mass with characteristics developed over the low latitudes. Maritime tropical (mT) air, the principal type, is produced over the tropical and subtropical seas and is very warm and humid. Continental tropical (cT) air is produced over subtropical arid regions and is hot and very dry.

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