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compressor casing
2 Precisely, operative aerofoil from axial compressor
rotor.
compressor casing Fixed casing closely surrounding
compressor rotor.
compressor characteristic Plot of fundamental
compressor performance, P 2 /P 1 (preesure ratio) as ordinate
and WT/ρ (corrected mass flow) as abcissa.
compressor diffuser Passage for working fluid immediately
downstream of compressor wherein pressure is
increased at expense of flow velocity.
compressor efficiency Useful work done in delivering
fluid at higher pressure, in assumed adiabatic operation,
expressed as percentage of power expended in driving
rotor.
compressor map Fundamental graphical plot of
compressor performance showing variation of pressure
ratio (ordinate) against mass flow (abscissa) for each rpm
band.
compressor pressure ratio Ratio of total-head pressure at
delivery to that at inlet (if ratio is 24:1, conveniently
written as 24, for example).
compressor rotor Main moving part in compressor of
rotary form (ie, not reciprocating type).
compressor stator Stationary part of axial compressor
carrying fixed vanes.
compressor vane Stationary blade attached to stator
(case), one row of such vanes preceding each row of rotor
blades.
compromised 1 Classified information known or suspected
to have been disclosed to unauthorised persons.
2 Of serial number or civil registration, one inadvertently
applied to two aircraft.
Compton wavelength Defined as h/m o C = 2.42631 ×
10 -12 m.
Comptuex Composite training unit exercise (USN).
Compu-Scene Add-on visual system for existing simulators
(General Electric).
computational fluid dynamics Representation of a
surface by a fine grid, enabling program to determine fluid
flow over it in terms of velocity, pressure, force, moment,
temperature and possibly other variables. Impossible
before powerful computers.
computed air release point Air position at which first
paratrooper or cargo item is released to land on objective.
computed approach MLS approach to a runway not
aligned with an MLS radial.
computer 1 Machine capable of accepting, storing and
processing information and providing results in usable
form; function may be direct control of one or more operating
systems.
2 Simple mechanical device for solving problems (eg
Dalton *).
computer acceleration control Use of airborne computer
linked to AFCS to limit (close to zero) unwanted flight
accelerations, esp. in vertical plane, on aeroplanes and
helicopters.
computer-assisted approach sequencing Use of one, or
several interlinked, computers in ATC system to solve
problem of feeding arrivals automatically into optimised
trajectories so that each arrives at destination runway at
correct spacing and with minimal delay.
computer board Component part of a computer or
similar device, each being a driver, RAM, EPROM, A/D
converter, video interface or similar self-contained unit
condensation shock
which can be assembled with others on to a bus (eg, backplane)
to form a purpose-designed EDP system.
computer-programmable Capable of being controlled by
digital computer without additional interfacing (typical
item would be microwave signal generator for radar
testing).
computing gunsight Automatically compensates for
most predictable or measurable variables in weapon
aiming.
COMR Civil[ian]-owened, military registered [initially
helicopters] (UK).
comsat See communications satellite.
Comsec Office of Communications Security (US, NSA).
comsnd Commissioned (of facilities on airfield charts).
COMSS Coastal/oceans monitoring satellite system.
CON, Con 1 Consol beacon.
2 Continuous.
3 Console.
4 Control.
Conac Continental Air Command (1 December 1948,
became part of ADC).
Conaero Consorzio Italiano Compagnie Lavoro Aereo
(1).
Conar Continental Norad Region (US).
Conc Concrete surfaced runway (ICAO).
concentrated force, load See point force, load.
concentration ring 1 In balloon, ring, usually rigid,
attached to envelope or (if applicable) surrounding net,
and from which basket is suspended.
2 In airship, ring to which several mooring lines may be
secured (sometimes also helping support car, if this is
suspended below hull).
concentric Having common centre or central axis.
concession 1 Allowable departure from drawing or
other design authority in manufacture of part (eg on
material spec., surface finish or manufacturing tolerance).
2 Allowable non-compliance with certification or other
requirement, esp. in emergency (eg take-off permitted
with one engine or one altimeter inoperative).
concrete cloche HAS1 (colloq., UK).
concurrence Policy adopted for reasons of national
emergency in which most, or all, parts of major system
programme are implemented simultaneously, even
though several large portions may need to be grossly
modified or updated (eg Atlas ICBM hurriedly deployed
above ground, then in surface shelters and finally in silos).
concurrent engineering 1 Consideration of market,
design, manufacture [and tooling], test and life support,
from outset.
2 Automatic storage in every design database for all
parts of new vehicle of each new technique for reducing
RC2 (2).
concurrent forces Acting through common point.
Cond, Conds Condition[s].
condensation Physical change from gaseous or vapour
state to liquid.
condensation level Height at which rising parcel of air
reaches saturation; cools at DALR and reached 100% RH
at ** at intersection of DALR and DPL.
condensation nuclei Minute particles, solid or liquid,
upon which nucleation begins in process of condensation;
most effective ** are hygroscopic.
condensation shock Sudden condensation of supersaturated
air in passage through normal or inclined shock,
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