water injection

nacelp nacelp at bright.net
Tue Feb 1 03:36:45 GMT 2000


Pre turbo with just relatively small amounts.
The water in healthy does, erodes the wheel, badly.
All the compressor wheel does then is sling the water to the walls of the
housing outlet.  Think Centrifigall force
Bruce


> >>With care, some before the turbo can be very effective and perhaps the
> >>simplest--
> >
> >True, since you don't need a manifold-referenced regulator.
> >In fact, can't you use the boost pressure to build up
> >pressure in the water tank and thus have automatic rising
> >injection rate?
> >
> >I have seen discussion of this subject before and there was
> >some concern over water droplets causing erosion of the
> >compressor blades when it's wound up to 100,000 rpm or so.
> >Any comments?
>
> I think very fine atomization is the key to avoiding this as well, that
> plus only putting enough water in pre-turbo so as not to go past
saturation
> (with respect to water) at the turbo outlet volume flow/temp conditions.
> And, remember--the pre-turbo water will lower the turbo compressoor outlet
> temp considerably. How much water to use here can be calculated.
>
> For fine atomization of pre-turbo water, enough pressure is going to be
> necessary to make "boost referencing" it, or using boost pressure to boost
> the pump about irrelevant. You will likely need at least 250--300 psi
water
> pressure, or else compressed air atomization at the nozzle, to get it as
> fine as it ought to be.
>
> Greg
> >
> >-Charles
> >'81 BMW 745i currently knock-limited to 15 psi boost
>
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