Nozzle Design (C-D)
Estimate an ideal choked C-D nozzle expansion using perfect-gas isentropic relations and the momentum plus pressure thrust equation.
Total thrust
52.10 kN
Isp 255.6 s
Mass flow
20.78 kg/s
Ve 2,581 m/s
Area ratio
6.339
Ae 0.0634 m2
Exit state
77.1 kPa
1,708.5 K, overexpanded
C-D nozzle expansion
A choked throat fixes mass flow, then the diverging section turns chamber pressure into exit velocity.
M exit 3.00
Pressure match
p_e/p_a 0.76
exit pressure below ambient
Area ratio
A_e/A_t 6.339
sets the supersonic branch
Mass flow
20.78 kg/s
fixed at the choked throat
Thrust
52.10 kN
momentum plus pressure term, exit pressure below ambient
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