Flow rates for nozzles

[Barry E. King]

Cool.  That helps.  After seeing it, I do recall that formula from some
previous lifetime.

With my scheme I had planned on using volume flow of water proportional to
fuel flow factored by the density.  Presuming linear delivery of an injector
(more or less) across the IDC, that would eliminate the need to perform the
mass flow rate calculation and just use a simple proportion.  I know most
injectors are not toally linear but since the water/alcohol injector is only
really going to be put to use in the mid to upper range of IDC I think it is
reasonably safe to assume linearity.  I will perform some tests to see just
how far off base that presumption actually is.


Regards,

Barry

> -----Original Message-----
> From: owner-diy_efi at efi332.eng.ohio-state.edu
> [mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Greg
> Hermann
> Sent: Thursday, December 17, 1998 7:42 PM
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Flow rates for nozzles
>
>
>
> >>
> >>So, I need to know how to calculate flow for currently available
> >>conventional nozzles
>
> A pretty close approximation  is that an injector which would flow 30
> lbs./hour of (typical) gasoline at a given delta p will flow 34.9
> lbs./hour
> of water at the same delta p. This same ratio would apply pretty much
> regardless of flow units or injector size when going from gasoline flow to
> water flow.  Different story if a particular is actually rated in terms of
> mass flow of alky (and ethanol different from methanol).
>
> Ignoring viscosity considerations, relationship is as follows: Mass flow
> rate 2 = Mass flow rate 1 times square root of ( density 2 divided by
> density 1). {At any given constant delta pressure, and assuming a
> non-compressible fluid.} (Density of water is 8.33 lbs./gallon; Density of
> typical gasoline blend is 6.16 lbs./gallon; Density of methanol is 6.60
> lbs./gallon; Density of ethanol is 6.54 lbs./gallon.) (All figured using
> U.S., 230.4 cubic inch gallons.)
>
> Regards, Greg
>
>