Thrust and Specific Impulse for Rockets
Figure 14.1: Schematic of rocket nozzle and combustion chamber |
The steady flow energy equation
then with no heat transfer or shaft work,
which can be written as
and manipulated to obtain
using
Then considering the relationship we derived for thrust,
and
Rearranging,
Thus the specific impulse can be directly related to the exhaust velocity leaving the rocket,
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