The discussion centers on the role of air-fuel mixture compression in various types of engines, including internal combustion engines, turbines, ram jets, and rocket engines. Participants explore whether compression is necessary for achieving higher or more efficient energy output, considering different engine types and their operational mechanics.
Participants express varying views on the necessity and impact of compression across different engine types, indicating that the discussion remains unresolved with multiple competing perspectives on the topic.
Participants have not fully explored the implications of specific engine designs or the mathematical relationships governing energy output and compression, leaving some assumptions and dependencies unaddressed.
Individuals interested in engine mechanics, thermodynamics, and the efficiency of combustion processes may find this discussion relevant.
For piston engines higher compression is better (as long as the octane is high enough to avoid pre-detonation). I'm not sure about turbines, ram and scram jets. Compressing the air first increases the amount of oxygen available to mixs with the fuel in jet engines, so it's more efficient in terms of power versus size and/or weight to compress the air.Dreamer 2008 said:Is the compression of the air fuel mixture required to give a higher or more efficient energy output?
Pretty much, yes. The fuel has a specific amount of energy it can release on a unit mass or volume basis. Therefore, to get more energy, you need to burn more fuel. That more fuel requires a larger mass of air to keep the combustion near the optimal stoichometric air-fuel ratio. Not only that, but the thrust created by an engine is a result of the change in momentum of the air stream. The more air the engine pumps, the greater the momentum change that is possible.Dreamer 2008 said:Is the compression of the air fuel mixture required to give a higher or more efficient energy output?