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Date: Thu, 20 Dec 2007 11:30:08 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Degrees overlap
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Lehanover@aol.com wrote:
>  
> So rather than making a fuel/air mixture elsewhere and dragging it past the  
> plugs at 100 MPH and complaining about HC problems, let us inject our  burning 
> mixture into the hottest possible compressed air we can make, and do it  
> between the current plug locations. You cannot detonate it when all of the fuel  
> is in one location. And if it cannot detonate how much boost could it  stand?  
> High boost with no inter-cooler?
>
>   
Lynn, I think you are so far above my head that I'm only getting the 
10,000ft view of what's going on.  I've read your post twice, and still 
don't know that I have it.  But tell me if this sound right.

The Carnot cycle, in its simplest form, we have a chamber that ingest 
some air, compresses it, heats it, then extracts energy from the 
resulting expansion.  The heating has traditionally been done by mixing 
some fuel in with the ingested air, and burning it after it is compressed. 

You're suggesting that we replace the fuel/air mixture with a sort of 
blowtorch?  The mixture comes in burning, and if there are any surplus 
HCs left over there is plenty of oxygen floating around in the chamber 
to take care of them while their energy is still useful.  Efficiency 
goes up.  Exhaust temps and noise both drop. 

What would it take, somewhere between 150 and 200 psi on the mixture 
injectors to handle 8:1 or 9:1 compression ratio rotors?