How Can I Calculate Rocket Exhaust Temperature?

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Discussion Overview

The discussion revolves around calculating the exhaust temperature of a rocket, particularly focusing on the parameters involved in compressible flow and the application of idealized rocket exhaust formulas. Participants explore the conditions of inlet gas pressure, temperature, and exit velocity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant seeks methods to calculate the exhaust temperature given specific inlet conditions (1.4 atmospheres, 300 degrees C) and exit velocity (325 m/s).
  • Another participant questions the familiarity with compressible flows and the method used to determine exhaust velocity.
  • A participant shares their background in college physics and describes their approach to calculating exhaust velocity and temperature using various parameters, including mass flow and isentropic expansion.
  • One suggestion is to explore resources related to "Gas Dynamic CO2 laser" for insights on energy in exhaust.
  • A reference to "Rocket Propulsion Elements" is provided as a potential resource for general rocket propulsion information.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants express varying levels of familiarity with the topic and different approaches to the calculations involved.

Contextual Notes

Participants mention specific conditions and parameters but do not resolve the complexities of the calculations or the assumptions involved in the idealized models they reference.

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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