Turbocharger tricks.

[zenji]

Lets say you have a turbo for a class of racing, the rules state the shaft holding both the turbine and compressor must be fixed.
In between the those two wheels an electro mechanical means of harvesting energy is allowed.

Now, with that in mind you can have electric motors which can both harvest from and drive that shaft.
See where I'm going?
You harvest a bit, pump a bit back and by these means you can scavenge the exhaust, compress more air.

Surely somebody does this trick?

[Lycoming]

Does your class of racing have a boost pressure limitation?

[Tim.Wright]

Lets say you have a turbo for a class of racing, the rules state the shaft holding both the turbine and compressor must be fixed.
In between the those two wheels an electro mechanical means of harvesting energy is allowed.

Now, with that in mind you can have electric motors which can both harvest from and drive that shaft.
See where I'm going?
You harvest a bit, pump a bit back and by these means you can scavenge the exhaust, compress more air.

Surely somebody does this trick?

Sound to me that if the regulations are allowing an electro-mechanical means of harvesting energy on that shaft then they are expecting that you will use it to scagenge and compress more intelligently...

[trinidefender]

Lets say you have a turbo for a class of racing, the rules state the shaft holding both the turbine and compressor must be fixed.
In between the those two wheels an electro mechanical means of harvesting energy is allowed.

Now, with that in mind you can have electric motors which can both harvest from and drive that shaft.
See where I'm going?
You harvest a bit, pump a bit back and by these means you can scavenge the exhaust, compress more air.

Surely somebody does this trick?

Unless I am not understanding your idea properly, teams already do this thorough the use of the MGU-H

[riff_raff]

Not as easy as you make it sound. If you are extracting energy from the exhaust gas flow by using the turbocharger turbine to drive a generator, then you will be creating a flow restriction across the engine. This will not improve exhaust scavenge of the engine core. But it should provide a net gain if there is excess energy in the exhaust gas flow.

However, if you use the electric motor to add energy to the turbocharger, this will result in a net input of energy to the engine. One difficulty with the design of conventional turbochargers is finding a compressor and turbine that provide an optimum performance level over the full range of engine speed/load. The turbocharger is basically a free turbine design that only responds to changes in the balance of pressure and mass flows between the intake and exhaust.

An electric motor/generator attached to the turbo spool makes things much easier by providing a way to actively regulate the speed of the turbo compressor and turbine.

[zenji]

'Does your class of racing have a boost pressure limitation?'
I don't believe so.
'An electric motor/generator attached to the turbo spool makes things much easier'
My thoughts too, I would love to see the Mercedes turbo apart; such a long shaft leaves plenty of room for an engineer to package something like a sizeable inrunner on there (the shaft).
Surely all that length isn't just to keep the compressor wheel cool.
'teams already do this thorough the use of the MGU-H'
To what length each engine builder does must surely be a trade secret.

[trinidefender]

'Does your class of racing have a boost pressure limitation?'
I don't believe so.
'An electric motor/generator attached to the turbo spool makes things much easier'
My thoughts too, I would love to see the Mercedes turbo apart; such a long shaft leaves plenty of room for an engineer to package something like a sizeable inrunner on there (the shaft).
Surely all that length isn't just to keep the compressor wheel cool.
'teams already do this thorough the use of the MGU-H'
To what length each engine builder does must surely be a trade secret.

Can you explain your idea better? Maybe draw a diagram? The mgu-h takes energy from the the turbine when there is excess exhaust flow and pressure differential for the required compressor speed and required mass flow to the engine. When they want to turn the compressor faster they simply make the mgu-h spool up the compressor.

[momal12]

'Does your class of racing have a boost pressure limitation?'