Quote:
Originally Posted by teoman
Warm air can also cause combustion of the fuel before the spark, this is not good at all beacuse the piston tries to move against the other pistons and something breaks.
|
Air temperature might be already more than "warm" once it starts leading to pre-ignition.
Quote:
|
Water gas has a much better expansion rate when they receive energy, this way they can generate more usable mechanical power from the combustion heat.
|
Not sure if the expansion rate of steam would improve the conversion of the energy contained in the fuel to heat so much at all, since it ends up decreasing the dynamic compression.
Quote:
|
The presence of water in the cylinder prevents detonation (or retards it). It also slows down the burn speed. The first thing is an advantage as mentioned previously, you can use lower quality or more energetic fuels, or increase compression to gain efficiency. The second part may not be so good as fuel may not have enough time to burn before exiting the piston. This has to be controlled or monitored so in my opinion a cylinder pressure monitoring system is interesting.
|
Ethanol has a lower energy content than gasoline, but it does have a greater resistence to detonation. So, would you consider it to be of a lower quality?
Anyway, since a lower amount of both the fuel and the supplementary water injection takes less latent heat from the intake stream, it doesn't sound so impossible at all to keep the temperature at a reasonable level in order to not disturb the flame spread
Quote:
|
Steam injection. Not sure what to think of this. It will take more volume than water droplet injection that is for sure. It carries a lot of energy. When steam encounter cooler fuel, it will transfer its heat to fuel helping it vaporize. What will it do to detonation? No idea...
|
Steam carries a lot of energy that had already been turned into heat. But it might be beneficial only as long as both the temperature and air relative humidity are low Otherwise it would be more of a trouble.