From: henry@spsystems.net   
      
   In article ,   
   toby   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.   
      
   Turbojet/turbofan engines invariably run lean, to keep turbine temperatures   
   within the bounds of the turbine-blade materials.  That's why afterburners   
   are useful, because there's unused oxygen in the exhaust.   
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   MOST launched 30 June; science observations running     |   Henry Spencer   
   since Oct; first surprises seen; papers pending.        | henry@spsystems.net   
      
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