5 ms·
15 pounds? Not gonna store much energy. Many cars already have several pound turbo impellers spinning at 50k+ rpm. (And remember force will be proportional to r
by TylerE 4y ago
15 pounds? Not gonna store much energy. Many cars already have several pound turbo impellers spinning at 50k+ rpm. (And remember force will be proportional to rpm^2)
- bagels 4y agoI don't think there are many turbo impellers that heavy, are there? The ones I've disassembled we're not very heavy from what I can recall.
- dtgriscom 4y agoThe energy also depends on the diameter; presumably the flywheel would be larger than a turbo rotor.
- dredmorbius 4y agoTurbos are small and lightweight. The goal is for them to respond quickly to changes in requested power, with minimal lag (already a problem). So small and light, with effective (air) pumping power. If your turboimpeller is doubling as kinetic energy storage, you're doing it wrong.
- winrid 4y agoI think parent comment's point is that they already have a dangerous spinning object. Not that I think this is a good counter argument...
- mrguyorama 4y agoIt's not accurate. Turbo impellers should not be heavy enough to store significant energy, except maybe in large diesel engines, and are also naturally housed in a large, often cast iron, housing that will easily contain any shrapnel.
- dredmorbius 4y agoTurbos also run periodically and reasonably infrequently, at least for street vehicles. They're invoked generally under high-acceleration or load, not when cruising at constant speed. A flywheel would typically be spinning not only far more often but at great speed and load.
- winrid 4y agoThat's why I said it wasn't a good counter argument. I agree they don't have enough mass to be a safety issue in most cases.