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Date: Fri, 4 May 2001 21:22:38 -0400
From: "Jean Luc Monette" <jlmonettenopsamotron.ca>
Subject: Re: Water Injection


"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

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