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Discuss twin screw vs centrifugal superchargers
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Source：Internet Author：Unknow Pubdate：2010-06-17
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bob8907 (Aerospace)
11 Jun 10 16:11
Have a few different applications but all will be higher rpm (6,000-11,000rpm) units. I really like the throttle response of screw but hear that centrifugal might have an edge for all our HP on top end. Can a properly designed and applied screw system be better than centrifugal?
Design goals are to maximize power potential on pump fuels so obviously inlet temp is a huge consideration. Either charger will mount directly on the engine so that form of heating is irrelevant. Very interested to see if there are better screw designs out there.
TDIMeister (Automotive)
11 Jun 10 23:57
Eaton's latest-generation TV-S Rootes (yes, you are not mistaken) blowers have peak efficiencies of 78%, up there with the best aerodynamic (centrifugal) devices.
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Selection all comes down matching the maps of the available chargers out in the market to the boost pressures and mass flows in which your particular engine will operate. Thermodynamically, the engine does not distinguish the type of charger you choose, but rather the mass flow, pressure and temperature of the discharged air and the mechanical power used to drive it.
Only the unregulated torque curve will look markedly different between a centrifugally-supercharged engine compared to other devices because the flow/RPM characteristic is fundamentally different.
CH5OH (Petroleum)
15 Jun 10 13:08
a centrifugal compressor has only a good efficiency at the design rpm, to operate an engine on different rpm you can use a few turbo's with different design characteristics and bypass valves to cover the full rpm range
a roots blower can deliver an amount of air, depending on the rpm, since it is mechanically coupled.Therefore, the efficiency of motor and supercharger will be in favour of the turbo.
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