The Jet reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Jet

See also jet (lignite), JET (Japanese English Teacher and Jet, a rock band from Melbourne, Australia.

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A jet is a stream of fluid produced by discharge through an orifice into free space.

Since gases are compressible fluids, the velocity attained by a jet of gas cannot be determined by Bernoulli's principle. Instead, if one uses adiabatic expansion from P₁ to P₂ in a properly shaped nozzle, the ideal velocity of a gas jet is:

where R and z are characteristics of the gas, R being the common gas constant and z being (c_p − c_v)/c_p, where the cs are the specific heat at constant pressure and constant volume, respectively. z = 0.286 for air under 500 °C. z = 0.23 to 0.28 for most combustion products of fuels. T₁ is the absolute temperature at pressure P₁.

See jet engine and jet aircraft.

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