Subject: Chemical energy in the exhaust.
From: Rotary Engine
Date: 7/19/2006, 9:34 PM
To: AA-me


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Bill, what do you think of cooling the exhaust gas to the
point where the water and hydrocarbons condense out to a liquid
and then separate the unburned  gasoline from the water
and recycle the gasoline to the fuel tank? The water can then be
fed back and used to help cool the exhaust gas upstream from the
condenser.

Seems like there is not much heat in the exhaust and a lot of
waste chemical energy when a car is going only 80 km/hr.

Paul Lamar ...No rotor no motor.
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There is very little unburned gasoline in the exhaust of any reasonably
tuned engine. The chemical energy in your chart, is mostly partially
oxidized hydrocarbons, (CO, aldehydes, etc. ) that are going to be hard to
recover, certainly cannot recover them by condensation -- the heat
exchanger
would be huge, and most of them are gases or low boiling point compounds.

The catalytic converter is getting rid of *trace* amounts of hydrocarbons
by
oxidizing them, if you had very much, it would overheat and/or coke up
with
carbon deposits (i.e. running super rich is not good for the converter).

Bill Schertz
KIS Cruiser # 4045


Thanks Bill. What exactly the waste chemicals energies were in the exhaust
was a question in the back of my mind. I incorrectly assumed, for
the moment, they were usable gasoline. I suppose you could say
the combustion chamber works as a cracking system.
-- 
Paul Lamar ...No rotor no motor.

Bill, do you think there is a higher percentage of usable
hydrocarbons in the exhaust of the rotary due to the poor
surface to volume ratio of the combustion chamber and the
rotating combustion chamber itself cooling the fire?
-- 
Paul Lamar ...No rotor no motor.

------------------------
There are probably more non-completely burned hydrocarbons in the rotary
exhaust, leading to a slightly lower BSFC, however, to call them 'usable' is
a stretch, since the concentrations are low. The only thing that appeals to
me is secondary air injection after the exhaust port, to oxidize the
unburned HC, and then extract energy from that stream with your
turbo-compound device.

By the way, I think some of that 'chemical energy' in the exhaust is
molecules at an 'excited state' that release energy back into the exhaust as
they decay down to a more stable state. Hard to make use of in a practical
system.

Bill Schertz
KIS Cruiser # 4045


OK Bill
Thanks

Paul Lamar

Bill

For a P-ported 13B do you have any idea of the flow and pressure the
injected air would need to be at?  I am considering it as an addition to the
Inconel spin muffler.

DougFir


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