SUMMARY
When a combustible gas mixture, such as O2 and H2, is combusted while in motion, the existing velocity of the gas adds to the velocity achieved from combustion. For instance, if the gas is moving at 150 feet per second, this velocity combines with the combustion velocity, which can reach several kilometers per second. The principle of momentum conservation dictates that the center of mass of the gas cloud retains its motion, allowing for continued thrust from a rocket motor even when exceeding the exhaust velocity of the fuel. This phenomenon illustrates that there is no "free lunch" in propulsion, as all propellant must be accelerated prior to combustion.
PREREQUISITES
- Understanding of basic combustion chemistry, specifically the reaction of O2 and H2 to form H2O.
- Knowledge of classical mechanics, particularly the concept of momentum conservation.
- Familiarity with rocket propulsion principles and exhaust velocity.
- Basic grasp of thermodynamics, especially regarding energy transfer during combustion.
NEXT STEPS
- Research the principles of momentum conservation in fluid dynamics.
- Explore the mechanics of rocket propulsion and thrust generation.
- Study the thermodynamics of combustion reactions, focusing on energy release and velocity calculations.
- Investigate the effects of gas velocity on combustion efficiency and performance in aerospace applications.
USEFUL FOR
Engineers, physicists, and students in aerospace and mechanical engineering fields who are interested in combustion dynamics and propulsion systems.