I know there have been rotary diesels made that were
self-supercharging, but I was wondering if the same could be done
with a 13B style engine. I was thinking along these lines:
The front rotor would have a custom housing with a mirrored p-port
setup such that it created an intake and compression event on both
sides of the housing. This compressed air would be ducted together
and then to the intake of the rear rotor giving you an nearly 2:1 PR
supercharge (there would be some losses). When compressed at ~9:1
in the rear, the total CR would be around 18:1, which would be
sufficient for compression ignition. The leading plug could be
replaced by a direct injection nozzle, and the trailing plug could be
a glow plug.
There would be some things to work out with sealing, housing
thickness, etc, to handle compression ignition, but I think it's
doable.
A quick guesstimation showed that this should produce around
100-120hp at 7500 rpm counting the power needed for the compressor
section. Combined with a turbo, you could probably push it to
150-175... turbocompound would be even better.
Any thoughts?
Josh
Diesel exhaust is hazardous to your health according to WHO ....AKA
World Health Organization. A diesel rotary may not run at 7500 RPM
because of burn rate issues.
Paul Lamar
Hi!: Rolls-Royce, I don't remember well if it was RR or Mercedes who
discovered the nickasil coverage for trochoid surface,
worked in a two-stage Diesel Rotary Combustion Wankel Engine for
military purposes, it had a big lower section rotor that acted as
a compressor, and an smaller upper high pressure section rotor where
combustion took place, the author was David W Garside,
and a report about it exists in a technical publication of the British
Society of Automobile Engineers proceedings.
The inherent problem in compression ignition Wankel RCEs would be that
the nature of Wankel engine makes impossible because of
geometrical reasons obtaining in a single rotor compression ratios high
enough for the Diesel range, there is at least a SAE paper
about a low compression ratio Diesel Wankel RCE, but the images of the
chimney they used to evacuate exhaust gases show a very
thick smoke column.
There are some patents on other two-stage arrangements for Wankel RCE
Diesel engines where the big and the small rotors are placed in line,
not one over the other as in the Garside design, but I'm not aware of
any practical unit using the concept, you can access the
patents by entering ESPACENET, and then, in advanced search mode,
writing the key words -Diesel or -Compression Ignition -Rotary Engine
Should you have news, please let us know.
I'd say the concept in the video of the link below is somehow close
to a 'Turbo-compound'
Does somebody have an experience or references about it?
Thanks, have a good week. Best regards. Salut †
http://www.vandynesuperturbo.com/video.html
Jose Gros-Aymerich; Madrid, Spain
Turbo compound for truck engines are selling well. Look up DD15.
Paul Lamar
The hazard of diesel exhaust is grossly exaggerated by the tree-huggers
because they want to ban them and every other internal combustion engine
out
there, including rotaries. There is no problem as long as you're not
sucking on the exhaust pipe.
Steve Brazil
I don't think it is the tree huggers. They all seem to like diesel.
It is the WHO.
Quote
(CNN) -- Exhaust from diesel engines can cause cancer, a prominent
global cancer group that's part of the World Health Organization said
Tuesday.
While the International Agency For Research On Cancer (IARC) has no
power to set or enforce rules, many governments look to it for guidance
and the decision could put pressure on those governments to introduce
stricter limits on emissions, especially to protect workers who are
exposed to diesel exhaust while on the job.
The IARC has for more than two decades classified diesel engine exhaust
as a "probable" carcinogen -- a cancer-causing agent -- but until
recently there was no clear evidence linking it to higher cancer rates.
This winter, however, two studies were published based on research
involving more than 12,000 mine workers done by the National Cancer
Institute and the National Institute for Occupational Safety and Health,
known as the Diesel Exhaust in Miners Study, or DEMS.
Together, the two new papers found an increase in lung cancer rates
among workers exposed to diesel exhaust underground, with greater
exposure linked to steadily higher cancer rates. In workers with the
highest exposure, deaths from lung cancer tripled in one study, and
increased five-fold in the other.
End Quote
http://www.cnn.com/2012/06/12/health/diesel-fumes-cancer/
Paul Lamar
I don't see a reference to a control group in the article. I'm not
planning on keeping company with a running diesel engine under ground
any time soon. You don't suppose that breathing coal dust would have any
effect on the outcome of the investigation would you?
Mark LaPierre
The underground study was not the only study. In France 60% of the
cars are diesel. Most without pig piss. If you can smell a diesel
you are breathing it.
Paul Lamar
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