Random versus ordered combustion temperature

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SUMMARY

The discussion centers on the temperature of molecules in a rocket engine's combustion chamber as they transition from a high state of random motion to a more ordered state upon exiting the nozzle. It is established that the temperature of the molecules increases as they leave the nozzle due to the decrease in pressure within the combustion chamber. This phenomenon is attributed to the relationship between pressure and temperature, where a decrease in pressure correlates with an increase in temperature in this context.

PREREQUISITES
  • Understanding of thermodynamics principles, specifically the relationship between pressure and temperature.
  • Familiarity with rocket propulsion concepts and combustion chamber dynamics.
  • Knowledge of molecular motion and its impact on energy states.
  • Basic grasp of fluid dynamics as it relates to nozzle design and function.
NEXT STEPS
  • Research the principles of thermodynamics, focusing on the ideal gas law and its applications in rocket engines.
  • Explore the effects of pressure changes on temperature in various states of matter.
  • Study the design and function of rocket nozzles, particularly in relation to combustion efficiency.
  • Investigate advanced topics in fluid dynamics, including compressible flow and shock waves in rocket propulsion.
USEFUL FOR

Aerospace engineers, rocket propulsion specialists, and students studying thermodynamics and fluid dynamics will benefit from this discussion.

dymand68
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1. Homework Statement :
Molecules in the combustion chamber of a rocket engine are in a high state of random motion. When the molecules leave through a nozzle in a more ordered state, will their temperature be more, less, or the same as their temperature in the chamber before being exhausted?

Homework Equations

temperature (energy) rises(or falls) as pressure increases (or decreases)

The Attempt at a Solution


temperature is more leaving through the nozzle, in a more ordered state (?)
 
Physics news on Phys.org
The temperature of the molecules will be greater when they leave through the nozzle. This is because as the pressure in the combustion chamber decreases, the temperature of the molecules increases. This increase in pressure is due to the more ordered state of the molecules as they leave through the nozzle.
 

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