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Location:
Perth
Registered:
May 2003
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Re: Mehanical engineers or other informed people - supercharger questions
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Mon, 13 December 2004 11:34
 
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Like everything there is good and bad points for twincharging.
A good example, Lancia S4 Group B rally car 
As Stewart said, the positive displacement supercharger compresses air externally, by forcing more air into a confined space (the intake manifold).
My understanding of it is, in essence the air is being accelerated through the supercharger so that the mass flow of air coming out of the supercharger is greater than than the rate at which the mass flow of air is being consumed by the engine.
In the case where the turbocharger is before the supercharger, once the turbo spools up such that it can maintain or exceed the mass flow rate of the supercharger, there is little need to keep the supercharger operating since the turbocharger is more efficient at compressing the air. The supercharger is only a power drag on the engine (in relation to the overall gain).
With a correctly sized single stage turbo pretty high boost can be reached.
In which case using a roots blower to increase low down torque until the turbo spools up, and then bypassing the supercharger is the way to go (my opinion).
Although an ideal roots blower doesnt add heat to the intake charge, due friction within the supercharger, some heat will be generated.
The other type of positive displacement blower refered to above has the screw type rotors or helix rotors. These are still not as efficient as turbochargers, but an improvement on the straight rotors.
Well there are some of my thoughts on the subject.
EDIT: Clarified some text.
[Updated on: Mon, 13 December 2004 14:11]
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| | Subject | Poster | Date |
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Mehanical engineers or other informed people - supercharger questions
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JAZE | Sun, 12 December 2004 12:31 |
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Re: Mehanical engineers or other informed people - supercharger questions
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oldcorollas | Sun, 12 December 2004 13:52 |
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Re: Mehanical engineers or other informed people - supercharger questions
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b1gb3n | Sun, 12 December 2004 14:09 |
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Re: Mehanical engineers or other informed people - supercharger questions
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JAZE | Sun, 12 December 2004 14:10 |
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Re: Mehanical engineers or other informed people - supercharger questions
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oldcorollas | Mon, 13 December 2004 03:49 |
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Re: Mehanical engineers or other informed people - supercharger questions
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earlyrolla | Mon, 13 December 2004 11:34 |
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Re: Mehanical engineers or other informed people - supercharger questions
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SupraPete | Mon, 13 December 2004 00:37 |
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Re: Mehanical engineers or other informed people - supercharger questions
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JAZE | Mon, 13 December 2004 14:31 |
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Re: Mehanical engineers or other informed people - supercharger questions
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earlyrolla | Tue, 14 December 2004 11:31 |
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Re: Mehanical engineers or other informed people - supercharger questions
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Norbie | Tue, 14 December 2004 12:05 |
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Re: Mehanical engineers or other informed people - supercharger questions
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JAZE | Tue, 14 December 2004 12:56 |
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Re: Mehanical engineers or other informed people - supercharger questions
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oldcorollas | Tue, 14 December 2004 13:47 |
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Re: Mehanical engineers or other informed people - supercharger questions
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M.W.P. | Tue, 14 December 2004 16:54 |
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Re: Mehanical engineers or other informed people - supercharger questions
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JAZE | Tue, 14 December 2004 17:02 |
