Fuel Pressure

[Derrick Early]

> >	I'm sure this was discussed before but I couldn't find it.
> >	As fuel pressure is increased, injection volume increases.
> >	Is the increase linear with injection duration?
> 
> As fuel pressure increases, the volume of flow increases as a function
> of the square root of the ratio of the pressures.
> Example: 
> 
> 	 --------------			   -------
> 	 | new pressure			   | 60psi
> 	 | ------------  = vol increase =  | -----  = 1.22 times old flow
> 	\| old pressure			  \| 40psi
> 
> The volume delivered is linear with injection duration.

What about choked flow?  Maybe an orifice area term is needed for 
really big changes in pressure.

Yours,
--
Derrick Early
early at finite.nrl.navy.mil