Symbols

c effective exhaust velocity, m/sec (ft/sec)

cp specific heat at constant pressure, J/kg-K (Btu/lbm-R)

cs specific heat of solid, J/kg-K (Btu/lbm-R)

cv specific heat at constant volume, J/kg-K (Btu/lbm-R)

c* characteristic velocity, m/sec (ft/sec)

CF thrust coefficient

d total derivative

e energy conversion efficiency

go standard sea level gravitational acceleration, 9.8066 m/sec2

h enthalpy per unit mass, J/kg (Btu/lbm)

Is specific impulse, sec or N-sec3/kg-m (Ibf-sec/lbm)

J mechanical equivalent of heat; J = 4.186 J/cal in SI units or 1 Btu

= 777.9 ft-lbf k specific heat ratio

m mass flow rate, kg/sec (Ibm/sec)

M mach number

931 molecular mass, kg/kg-mol (or molecular weight, lbm/lb-mol)

m, molar fraction of species i p pressure, N/m2 (Ibf /ft2 or lbf/in.2)

R gas constant per unit weight, J/kg-K (ft-lbf/lbm-R) (R = R'/ffl)

R' universal gas constant, 8314.3 J/kg mol-K (1544 ft-lb/lb mol-R)

T absolute temperature, K (R)

V specific volume, m3/kg (ft3/lbm)

w propellant weight flow rate, N/sec (lbf/sec)

Greek Letters a half angle of divergent conical nozzle section

P mass fraction of solid particles e area ratio A2/A, ¡;d discharge correction factor t;F thrust correction factor velocity correction factor A. divergence angle correction factor for conical nozzle exit

Subscripts

a

actual

g

gas

i

ideal, or a particular species in a mixture

max

maximum

opt

optimum nozzle expansion

s

solid

sep

point of separation

t

throat

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Project Management Made Easy

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