Exhaust Velocity Calculator:
Enter the values of Thrust force F(Newton), Exit pressure pe(N/m2), Atmospheric pressure pa(N/m2), Exhaust Area A(m2) & Mass flow rate mdot(kg/s) to determine the value of Exhaust Velocity V(m/s) .
Exhaust Velocity Formula:
The Exhaust Velocity V(m/s) in meter per second is equal to the Thrust force F(Newton) in Newton to subtracted by the Exit pressure pe(N/m2) in Newton per meter square and subtracted to the Atmospheric pressure pa(N/m2) in Newton per meter square and multiply the Exhaust Area A(m2) in meter square is Divided by the Mass flow rate mdot(kg/s) in kilogram per second.
The Equation of Exhaust Velocity can be writtern as,
V(m/s) = ( F(Newton) – ( pe(N/m2) – pa(N/m2) ) * A(m2) ) / mdot(kg/s)
Here,
V(m/s) = Exhaust Velocity in meter per second
F(Newton) = Thrust force in Newton
pe(N/m2) = Exit pressure in Newton per meter square
pa(N/m2) = Atmospheric pressure in Newton per meter square
A(m2) = Exhaust Area in meter square
mdot(kg/s) = Mass flow rate in kilogram per second
Example Problems for Exhaust Velocity :
1)Determine the Exhaust Velocity and given for Thrust force = 4500N , Exit pressure = 80N/m2 , Atmospheric pressure = 20N/m2 , Exhaust Area = 2m2 , Mass flow rate = 400kg/s.
Answer
V = ( F – ( pe – pa ) * A ) / mdot
V = ( 4500 – ( 80 – 20 ) * 2 ) / 400
V = 10.95m/s.
2)Determine the Mass flow rate and given for Thrust force = 4500N , Exit pressure = 80N/m2 , Atmospheric pressure = 20N/m2 , Exhaust Area = 2m2 , Exhaust Velocity = 10.95m/s.
Answer
V = ( F – ( pe – pa ) * A ) / mdot
10.95 = ( 4500 – ( 80 – 20 ) * 2 ) / mdot
mdot = 400kg/s.