From: toby@ccl.umist.ac.uk   
      
   Cameron Dorrough wrote:   
      
      
   >   
      
   > To answer your question, water injection (either straight de-ionised water   
   > or a DI water/alcohol mix (50/50, IIRC) ) is still used occasionally on some   
   > freight/commercial aircraft to increase thrust on take-off.  It is stored in   
   > a separate tank on the aircraft and is injected directly into the combustion   
   > chamber as required.   
      
   Any idea whether this combustion chamber injection is fuel rich or is a   
   lean mixture.   
      
   I imagine the max thrust you could get from this would be when you have   
   just enough water to stop coking and you run very fuel rich to ensure   
   the combustion temperature remains tolerable. this should give the   
   greatest mass flow if your not interested in fuel efficiency.   
      
   Or is that wrong?   
      
   >   
   > With the ever-increasing efficiency of modern turbo-fan engines, the need   
   > for this sort of thust enhancement is waning dramatically, so it would not   
   > surprise me to hear there has been no further research on this subject.   
   >   
      
   It seems to me to be of importance to space applications though.   
      
   > I hope this helps.   
   Yes, thanks.   
      
   Toby   
   >   
   > Cameron:-)   
   >   
   >   
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