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Date: Sat, 05 May 2001 01:38:28 GMT
From: devil <devilnopsamlobal.net>
Subject: Re: Water Injection


Jean Luc Monette wrote: > > "John Griffin" <johnnopsamfinphoto.u-net.com> a Ècrit dans le message news: > B718B1C4.79FD%johnnopsamfinphoto.u-net.com... > > in article 3AF22B14.BCD2D8FEnopsamlobal.net, devil at devilnopsamlobal.net > > wrote on 5/4/01 5:08 AM: > > > > > John Davies wrote: > > >> > > >> On Wed, 2 May 2001 23:14:54 -0400, "Jean Luc Monette" > > >> <jlmonettenopsamotron.ca> wrote: > > >> > > >>> Hi all! > > >>> > > >>> Actually, water-methanol injection has been used on turbine aircraft > engine > > >>> for a very long time. What it does? > > >>> lowers inner turbine temperature, increases air density since water is > less > > >>> compressible than air, thus permitting to produce more power at less > > >>> temperature inside the engine. Mind you that this is done in a > controlled > > >>> fashion, as far as water in a puddle is concerned, I wouldn't want > that to > > >>> get in my saab's turbo!!! > > >> > > >> My thoughts on water injection: the performance increase is due to the > > >> dramatic cooling of the incoming air by the rapid evaporation of the > > >> water droplets. Not because water is "less compressible" than air. > > >> There is no liquid water by the time the airflow has reached the > > >> critical parts of the engine. > > > > > > Actually, it's because with the water in, the mass of the cycle fluid is > > > increased. > > > > Please explain exactly how increasing the mass of the 'cycle fluid'( and > > explain this term) can produce more power or cool the in cylinder > > temperature? > > > > The conversion of water from it's liquid form to steam in the cylinder > uses > > up the heat of the intake charge. > > BTW methanol was added to the water in aircraft engines only as an > > antifreeze which is very necessary at altitude. > > > > Actually John, water-methanol is used on aircrafts which have problems > achieving their maximum torque when the outside air temperature becomes very > warm causing them to be temperature limited as opposed to torque limited in > the wintertime... re: Swearingen Metroliners, Hawker Sideley's 748 and so > on. I'm very disappointed to tell you that the only way to de-ice or > anti-ice an aircraft turbine engine in altitude or on the ground is through > engine bleed air being routed to the engine's intake lip (jet or turbine > engine) but we're very far from the subject this newsgroup is about: Saabs It's all the same idea anyway. Lowering the temperature, you get more mixture through. But yes it's particularly tough on jet engines in hot/high conditions.

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