3 ms·
It's easier if you imagine identical fans for the compressor and turbine but gearing so the turbine can spin faster. Of course the gasses will take the easy wa
by benlivengood 6y ago
It's easier if you imagine identical fans for the compressor and turbine but gearing so the turbine can spin faster. Of course the gasses will take the easy way out the turbine. At some speed, air stops going out the compressor and comes in instead. Burning fuel keeps the gas expanding so there's still a lot more volume to go through the turbine. Then adjust blade angles and turbine diameters to get rid of the gearing.
- mrfusion 6y agoThat’s an interesting way to look at it. I can kind of see that. Thanks!
- tim333 6y agoOr another way. If the thing was symmetrical the pressure would push both ways and it wouldn't move so the designers have to make it asymmetrical so it's easier to get out the exhaust. I think in practice the compressor blades are closer to perpendicular to the flow than the exhaust turbine ones. It's also important that there is a larger volume of gas leaving the engine than going in as it expands when the fuel heats it. So while the pressure is the same the energy is greater on the turbine side due to the greater volume so it has power to run the compressor as well as fly the plane.