How Can I Calculate Rocket Exhaust Temperature?

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SUMMARY

This discussion focuses on calculating the exhaust temperature of a rocket, specifically under conditions of 1.4 atmospheres inlet gas pressure at 300 degrees Celsius, and an exit velocity of 325 m/s. The user utilized principles of compressible flow and the idealized rocket exhaust formula, factoring in mass flow, temperature, molecular weight, inlet pressure, and isentropic expansion. They referenced the de Laval nozzle and sought clarification on the computation of exhaust temperature, indicating a need for deeper understanding of thermodynamic principles beyond simple adiabatic expansion.

PREREQUISITES
  • Understanding of compressible flow dynamics
  • Familiarity with thermodynamic principles, particularly isentropic processes
  • Knowledge of rocket propulsion concepts
  • Basic physics training related to gas properties and behavior
NEXT STEPS
  • Research the principles of isentropic expansion in compressible fluids
  • Study the de Laval nozzle design and its impact on exhaust temperature
  • Learn about the calculations involved in determining exhaust velocity and temperature for rocket propulsion
  • Explore the technical details of gas dynamics in applications such as CO2 lasers
USEFUL FOR

Aerospace engineers, rocket propulsion researchers, and students interested in the thermodynamics of rocket exhaust systems will benefit from this discussion.

Jedi_Sawyer
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Does anybody know how or where I can find a way to figure the Exhaust Temperature of a Rocket. I am considering a problem where I assigned 1.4 atmospheres to the Inlet gas pressure at 300 degrees C.
That it exited into 1 Atmosphere at exit velocity of 325 M per second.
 
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How familiar are you with compressible flows, and how did you determine the exhaust velocity?
 
I'm not terribly familiar with compressible fluids but I do have college physics trining.
I'm writing something not for school and I wanted subsonic rocket exhaust, and I need to know the velocity of the exhaust and it's temperature I got the formula for some idealized rocket exhaust, Ve, as a function of a lot of things such as mass flow, Temperature, molecular weight, Inlet Pressure, and Isentropic Expansion. I looked up everything for dry air, 29KG/kmol. Starting with Inlet Pressure at 1.4 Atmospheres and and outlet pressure at 1 Atm. with the inlet gas at 596 degress K, I computed 325 m/s for the exhaust speed. The Wiki article for the de Laval nozzel has an example that uses dry air and it specifies the exhaust temp but I have no idea how they computed it. It doesn't seem to be a simple adiabatic expansion thing. So that is my story.
 
One place you might look is do a search on "Gas Dynamic CO2 laser" If you can fine a good technical description, it will have a lot of info related to the energy in exhaust.
 

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