specific impulse

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specific impulse

n.
A performance measure for rocket propellants that is equal to units of thrust per unit weight of propellant consumed per unit time. Also called specific thrust.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

specific impulse

n
(Astronautics) the ratio of the thrust produced by a rocket engine to the rate of fuel consumption: it has units of time and is the length of time that unit weight of propellant would last if used to produce one unit of thrust continuously
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

specif′ic im′pulse


n.
a measure of how efficiently a rocket engine burns its fuel.
[1945–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations
impulsion spécifique
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References in periodicals archive ?
Exhaust velocity of 8, 10 and 12 m/s (1,575, 1,968 and 2,362 fpm) were selected.
Cumulative soot mass, mass flow rate, flux and concentration are all related via exhaust velocity, pipe cross-sectional area and time.
The resulting inlet exhaust velocity is 70m/s, which is beyond regular EGR operating conditions.
In their study they have observed that Model 5 was the optimum design having 0.845 bar back pressure and 12.5 m/s exhaust velocity. Model 5 is seen to have the same convergent and divergent length.
William Gerstler (2002) notes the following: "Commercial kitchen design professionals were concerned that the minimum exhaust air duct velocity of 7.62 m/s (1500 fpm)," which was an NFPA requirement, "was too restrictive." The completed research work addresses "the relationship between grease deposits and exhaust velocity....
Where [[rho].sub.0] is the air density, [[rho].sub.5.II.E1,2] is the gas density, [a.sub.0] is the speed of sound, [C.sub.5.II.E1,2] is the exhaust velocity and [M.sub.a,g.E1,2] is the flow.
Electric propulsion doesn't produce very much thrust because the engine is not expelling a lot of propellant, but the exhaust velocity is very high--up to 90,000 mph with NEXT.
The first generation of subsonic jetliners was very noisy because of the high exhaust velocity of their engines.
Although these rockets do their job well but they have fundamental energy limits, which restrict them to a maximum exhaust velocity that is too low for most piloted missions with destinations beyond moon.
Keeping a high value of the exhaust velocity ensures a corresponding convective heat transfer coefficient.
For example, when the exhaust velocity is high, the excess energy could be stored in a battery for later use during low-exhaust cycles.