Not yet but we are getting closer.
http://www.rotaryeng.net/sum-turbo-comp.html
http://www.rotaryeng.net/Oxford-640-4802.wmv
http://www.rotaryeng.net/turbo-compound.html We are getting closer to
installing a DD15 truck engine turbo compound system on a 3 rotor engine.
"At the rated engine speed of the DD15, the turbine reaches a rotation speed
of more than 40,000 rpm. Power is transferred to the gear drive, and
therefore to the crankshaft, via a shaft and a hydrodynamic coupling. This
arrangement produces a uniform and smooth crankshaft rotation despite the
higher torque, according to the company; additionally, fuel consumption is
reduced by up to 5 percent compared with a similarly [UTF-8?]specâd
Series 60." I found a local Detroit Diesel repair shop and actually saw the
real thing. The shop is called "Big T's" 805 983 2408
<
http://www.bigtsftln.com/default.htm They kindly gave me some part numbers
with prices.
These engines are lasting up to a million miles so used parts
are in short supply. If you are lucky you might be able to find one out of
a truck wreck if the engine itself was damaged. If the engine was OK I am
sure somebody would pay big bucks for it. Word is out. These engines are
in high demand. We just need the waste power turbine and gear box. Any
Mazda 20B turbo charger will work. Maybe even the stock sequential turbo
version which I have in the hangar will work. All we need do is demonstrate
a 5% or 10% improvement in BSFC and the world will beat a path to the Wankel
rotary door.
I'll kidnap the Mazda engineers here in SoCal and force them
to look :) 30% better BSFC is theoretically possible due to the lack of
exhaust valves in the rotary and that would be a revolution in internal
combustion engines. This thing would easily replace a 600 HP turbo prop and
have half the fuel burn.
Paul Lamar
Paul, What if you could add the
turbo-compounding without the extra turbine weight and reduction gearbox.
What if it also acted like a muffler? Got your attention yet? Another new
fuel saving and power enhancing scheme for diesels and the new generation
gas engines is the use of cooled-EGR. With an existing turbo you cool a
portion of the exhaust gases via the wastegate/boost controller and reinjest
the mixture into the engine. The throttle must be opened more to acquire
the necessary oxygen (dropping pumping losses) and boost can go up but heat
produced goes down. The rotor has become the the mechanism for the
compounding power. You would run 20psi boost on 10psi fuel maps. Ideally
we could run throttle-less. Here is an interesting GM study.
https://docs.google.com/file/d/0B_jE2-IDoVTfb1RiWEs0ZmJCaDQ/edit?usp=sharing
Barry Bordes
Dave Leonard flies a turbo II 13b without a muffler. All
diesels run with wide open air throttle. There is no air throttle.
Paul Lamar
Paul, let me try this from another angle. Instead of thinking of a
rotary engine with a turbo.... think of it as*Turbine Engine *using the
rotary engine as the power turbine section with gear reduction. This new
turbine engine eliminates the expensive fuel control, burner section, and
gear reduction normally needed for turboprops. The historic problem has
been the rotary's high EGT which limits output. This now can be mitigated
using Cool-EGR like a compressed inert gas helping to spin the rotor for
free. More HP than a three rotor, plus less weight, plus half the BSFC.
Barry Bordes
I see only an increase in the size of the best BSFC island.
Any amount of torque is available with the right gearing and an infinitely
variable gear ratio. Not mentioned in the pdf. Cars accelerate on HP and
not torque. All and all a narrow minded paper based on a bunch of incorrect
assumptions . Also I see no charts where EGT is a parameter. All this is
political based on the sky is falling erroneous assumptions that we are
going to run out of oil. I was around in 1973 when the water melons were
saying we were going to run out of oil in 1990. Now we are swimming in oil
partially due to Fracking except the stupid water melons won't let us build
a pipeline. The answer is eliminate the moron water melons that want to
burn food for fuel.
Paul Lamar
I was working as an apprentice mechanic at a Caterpillar dealer during
that
time. A lot of people were discussing the water melons scare tactic. I said
then that there is lots of oil. Eventually we will run out, just when! New
technology improves the reserve stocks. In this area there is a lot of
activity in "tight oil". This is drilling into a geologic area that does not
allow the oil and gas to flow well. Fracing opens up the structure and
allows
flow. Multi stage fracs of up to 23 fracs per well allows flow rates of 200
to 300 barrels per day with some gas that flashes off when the pressure is
reduced. One company is planning a 32 well pad, with directional drilling
going 1-2Km's.
Dale Davies
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