turbine wheel

turbine wheel
Turbine Tur"bine, n. [L. turbo, -inis, that which spins or whirls round, whirl.] 1. A water wheel, commonly horizontal, variously constructed, but usually having a series of curved floats or buckets, against which the water acts by its impulse or reaction in flowing either outward from a central chamber, inward from an external casing, or from above downward, etc.; -- also called {turbine wheel}. [1913 Webster]

Note: In some turbines, the water is supplied to the wheel from below, instead of above. Turbines in which the water flows in a direction parallel to the axis are called parallel-flow turbines. [1913 Webster]

2. A type of rotary engine with a set of rotating vanes, diagonally inclined and often curved, attached to a central spindle, and obtaining its motive force from the passage of a fluid, as water, steam, or air, over the vanes. Water turbines are frequently used for generating power at hydroelectric power stations, and steam turbines are used for generating power from coal- or oil-fired electric power stations. Turbines are also found in jet engines, and in some automobile engines.

Note: In the 1913 dictionary, the turbine was further decribed thus: ``There are practically only two distinct kinds, and they are typified in the de Laval and the Parsons and Curtis turbines. The

{de Laval turbine} is an impulse turbine, in which steam impinges upon revolving blades from a flared nozzle. The flare of the nozzle causes expansion of the steam, and hence changes its pressure energy into kinetic energy. An enormous velocity (30,000 revolutions per minute in the 5 H. P. size) is requisite for high efficiency, and the machine has therefore to be geared down to be of practical use. Some recent development of this type include turbines formed of several de Laval elements compounded as in the ordinary expansion engine. The Parsons turbine is an impulse-and-reaction turbine, usually of the axial type. The steam is constrained to pass successively through alternate rows of fixed and moving blades, being expanded down to a condenser pressure of about 1 lb. per square inch absolute. The Curtis turbine is somewhat simpler than the Parsons, and consists of elements each of which has at least two rows of moving blades and one row of stationary. The bucket velocity is lowered by fractional velocity reduction. Both the Parsons and Curtis turbines are suitable for driving dynamos and steamships directly. In efficiency, lightness, and bulk for a given power, they compare favorably with reciprocating engines.'' [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • turbine wheel — Water wheel Wa ter wheel 1. Any wheel for propelling machinery or for other purposes, that is made to rotate by the direct action of water; called an {overshot wheel} when the water is applied at the top, an {undershot wheel} when at the bottom,… …   The Collaborative International Dictionary of English

  • turbine wheel — [1] A turbocharger wheel driven by exhaust gases, the turbine wheel spins at speeds up to 160,000 rpm and drives the compressor which is located at the opposite end of the turbine shaft; wheel and shaft are usually inseparable. [2] A driven… …   Dictionary of automotive terms

  • turbine wheel — A wheel or disc equipped with blades or vanes, designed to spin in reaction to a fluid flow passing over or across the vanes …   Aviation dictionary

  • Turbine — Tur bine, n. [L. turbo, inis, that which spins or whirls round, whirl.] 1. A water wheel, commonly horizontal, variously constructed, but usually having a series of curved floats or buckets, against which the water acts by its impulse or reaction …   The Collaborative International Dictionary of English

  • turbine pump — noun A device for raising water by the inverted action of a turbine wheel • • • Main Entry: ↑turbine …   Useful english dictionary

  • turbine — /terr bin, buyn/, n. any of various machines having a rotor, usually with vanes or blades, driven by the pressure, momentum, or reactive thrust of a moving fluid, as steam, water, hot gases, or air, either occurring in the form of free jets or as …   Universalium

  • wheel — A circular device, thin in relation to its face area, usually able to rotate about a central axle or pivot, with a durable but elastic rim or with regular teeth cut on the rim and for lightness often supported by spokes joined to the hub instead… …   Dictionary of automotive terms

  • turbine bucket — The blades of a turbine wheel. See turbine blades …   Aviation dictionary

  • turbine rotor — The complete turbine assembly with all its stages but excluding the stators. Also called a turbine wheel …   Aviation dictionary

  • turbine efficiency — The ratio of actual work performed by the turbine wheel in foot pounds/BTU and the laboratory standard of 778 ft lb of work in 1 BTU (British thermal unit), expressed as a percentage …   Aviation dictionary

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