Fw: Fw: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...

[Strasser]

Mike:

Yes, I agree ...research project

Timing water phase change requires work.  We all know that the rate of
evaporation of a liquid dropplet suspended in a gas phase is a function of
the following variables:  local turbulence, local temperature gradients,
local pressure surfaces, and dropplet size.  Vaporization is driven by
fugacities of the gas phase versus the liquid phase.  Experimentation would
have to be done with both dropplet size and injection temperature.

Wayne Strasser
Chemical Engineer
EFI Patent Pending

-----Original Message-----
From: Mike Dillon <mdill at lsil.com>
To: diy_efi at EFI332.eng.ohio-state.edu <diy_efi at EFI332.eng.ohio-state.edu>
Date: Friday, May 01, 1998 1:38 PM
Subject: Re: Fw: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...


I am not sure that you want or would be able to get water into the cylinder
"wet" in liquid form. Then once there how are you going to keep it from
vaporizing prior to TDC and just incressing the negative work needed to
compress it ? Maybe with a direct injection set up like a diesel fuel
injection
set to inject sometime just before TDC It might yeild some return, It might
just go though a lot of water also) Lets see bump the comp. ratio for better
efficincy add some water-alcohol (Need to  alcohol so the water won't freeze
in winter)
so it does not ping, then just before TDC inject more water and how will
this
effect the flame front ? It sounds like a good research project enayone want
to
fund me ?

Mike D.

> From diy_efi-owner at esl.eng.ohio-state.edu Thu Apr 30 23:09 CDT 1998
> Return-Path: <diy_efi-owner at esl.eng.ohio-state.edu>
> From: Strasser <strasser at mci2000.com>
>
> I too am considering this as a mileage enhancement.  I would have to
discuss
> the potential gains for increasing the water input rate above that which
is
> required for stopping detonation.  Since the engine utilizes such a small
> fraction of usable mechanical energy from the combustion of fuel, alot
> escapes the exhaust (among other places...)  By injecting more water, the
> normally-wasted heat energy is utilized to induce a phase change in the
> water from liquid to vapor, which obviously raises combustion chamber
> pressures since water (at STP) expands by a factor of ~ 1400 when
> evaporated.  Obviously, there is some optimum point here, since the
> existence of water molecules in the chamber impedes radical electron
> transfer processes and drops temperatures (hence the impact on
detonation).
> not sure where that optimum is....comments from all?
>
>
> Wayne Strasser
> Chemical Engineer
> EFI Patent Pending
>
> -----Original Message-----
> From: Bruce Plecan <nacelp at bright.net>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Thursday, April 30, 1998 4:15 PM
> Subject: Re: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...
>
>
> From: Danny Barrett <danny_tb at postoffice.utas.edu.au>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Subject: RE: Holden Commodore, Aerodynamics. AND NOW: WATER INJECTION...
>
>
> >I hope you didn't bite while you were writing this... Your tongue was
> >obviously firmly planted in your cheek. As for what it has to do with
> >injection... Nothing, except for the original email message (this is
about
> a
> >fifth or sixth generation reply, and the stuff about EFI have gradually
> been removed as
>
> >build a simple "home made" water injection system, and how much water
> should
> >I use? Can I simply splice another injector into an injector control line
> >(in parallel), and use another fuel pump to pressurise the water?
> >
> >Danny Barrett.
> >
> >
> I beleive Sir Harry Ricard used 30-50% of fuel volume as a norm.
> (this figure may have been primarily for turbo/supercharged appl).
> Lots of folks have used a windshield washer tank/motor as a
> dispenser (use a check valve so low manifold vacuum doesn't
> draw it out).  Also anything more than just enough to get rid of the
> detonation is a waste of fluid.  No real gains past that.  Might
> be more info in archives, about this.  ie injector types methods.
> Cheers
> Bruce
>
>
>
>