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Re: Adding water to fuel
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Posted by Bill Jones on July 30, 2002 at 21:29:27 from (67.241.18.248):
In Reply to: Adding water to fuel posted by Sonny Freyholtz on July 30, 2002 at 18:19:22:
Water was added as an ADI (anti dteonation device) the water slowed propegation (spreading ) of the flame front . If the speed of the flame front is slowed,the cylinder pressure can build without the danger of detonation and as the piston goes past TDC the higher effective pressure can do more work on the piston.
This all came about as a solution to poor fuel qualities of that era(low octane). The water wasn't added to cool the cylinder-burning distillate you wanted it hot. In an engine with 8:1 compression and 6.00" stroke and 5.40" bore ( I'm using a Rolls Royce Merlin engine as an example) with the sea level atmospheric pressure at 14.7 psi that would be 270 psi at the top of the compression stroke. On a nice cool day of,say 67 degrees F, the temp jumps to over 752 degrees F at the top of the compression stroke,turning water to steam instantly (flashing) The water in steam form takes up a bit of room too,increasing compression ratio of 8:1 to maybe 9:1.
The water is injected at the right time-AFTER the proper fuel /air mix has been drawn into the cylinder-remember you want the water to flash into steam,NOT take the place of air molecules vital to a proper air fuel ratio. When better fuels were developed (tetraethyl lead) providing more octane ,the water injection became less practical,except in high horsepower warbirds,and then it was only for a short duration-because after you broke the throttle stop safetey wire for Emergency War Power,the engine would need to be rebuilt.
The Germans did develop a complicated Methanol/Water Injection system for their aircraft to boost power.And you can still install a water injection system on your car for high performance
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