diesel rotary engine - the engine of the future?
Max Kallio
In the (near) future, could a rotary engine (wankel) with diesel turbo
charged direct injection be the ideal engine, at least for
applications where power to weight ratio is critical (like
light/ultralight aeroplanes, small boats and possibly sledges ie.
snowmobiles)?
This is kinda poll ;-)
Michael Culley
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Michael Culley
"Max Kallio" <maxx...@yahoo.com> wrote in message news:16bcd44c.04022...@posting.google.com...
Dale Peterson
to supercharger the two outside rotors. That would probably generate enough
compression to run diesel.
dp
"Max Kallio" <maxx...@yahoo.com> wrote in message
news:16bcd44c.04022...@posting.google.com...
Erik Litchy
> Heard it was possible to build a 3 rotor engine then use the middle rotor
> to supercharger the two outside rotors. That would probably generate enough
> compression to run diesel.
>
> dp
>
rolls royce made one like that
The Raven
Well, as the basic Wankel design can go up into the 20+ to 1 compression
ratios it's theoretically possible. The problem becomes, at these
compression ratios, an general increase in loading on the apex seals.
I believe there have been several deisel wankels.............who was that
industrial engine mob (scoresby or somesuch) that was producing the very
engine you describe. Engines came in one to six rotor versions, various
housing dimensions, and NA or Turbo'd.
The concept of lightweight and powerful has been investigated long ago by
the US DOD for mobile gensets.
So, to answer your question, they are feasible but whether they would be
significantly cheaper/practical than existing technologies is an unknown.
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The Raven
news:c1e55b$1h91n9$1...@ID-180780.news.uni-berlin.de...
> I believe rotaries have trouble running deisel due to compression ratio
limits.
I believe the wankel physical compression ratio limit is in the mid 20's
(Norbye covers it as does Felix Wankels book). Other wankel like designs
with different rotor and housing shapes can go much higher but the sealing
becomes a nightmare.
The Raven
news:103la95...@corp.supernews.com...
> Heard it was possible to build a 3 rotor engine then use the middle rotor
> to supercharger the two outside rotors. That would probably generate
enough
> compression to run diesel.
Or the Rolls Royce method mentioned in Norbyes book (IIRC). One large rotary
compressor pumps into a smaller rotary engine. You even get some benefit
with the exhaust pulse (if memory serves me right) but it defeats the
purpose to have a compressor larger than the actual engines. May as well use
the compressor as a larger engine.
do...@dieselxrot.usenet.us.com
> I believe there have been several deisel wankels.............who was that
> industrial engine mob (scoresby or somesuch) that was producing the very
> engine you describe. Engines came in one to six rotor versions, various
> housing dimensions, and NA or Turbo'd.
http://www.boatingnews.com/rotarymarine.htm
http://www.der-wankelmotor.de/Motoren/Motoren_RPI/motoren_rpi.html
I remember a Continental Diesel Rotary Generator, but I can't find a web
reference to it. I also remember a John Deere tractor with a rotary
diesel, but like some of the Evinrude outboard motors, I don't think they
ever got past the consumer shows.
--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8-122.5
do...@dieselxrot.usenet.us.com
Michael Culley
> I believe the wankel physical compression ratio limit is in the mid 20's
It's been a while since I read what I read on this but I think the problem was to get the high compression ratio you had to get rid
of the cut-out in the rotor face which effectively split the combustion chamber into 2.
--
Michael Culley
Felix Miata
> So, to answer your question, they are feasible but whether they would be
> significantly cheaper/practical than existing technologies is an unknown.
Theoretically possible, probably. Feasible, no way. To get a diesel
compression ratio would require eliminating any depression in the rotor,
squeezing all the intake charge into a very long, wide, very shallow
space, which with the attendant very high surface to volume ratio would
have awful combustion characteristics, if it had any at all.
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Littlefish
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The Raven
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> John Deer made diesel rotaries too.
And didn't they sell all that off to someone else? I'd have to look up
through a zillion references to find the two page article on it.
do...@dieselxrot.usenet.us.com
> "Littlefish" <little...@yahoo.com> wrote in message
> news:%BK6c.111283$Wa.3...@news-server.bigpond.net.au...
>> John Deer made diesel rotaries too.
> And didn't they sell all that off to someone else? I'd have to look up
> through a zillion references to find the two page article on it.
http://cp_www.tripod.com/rotary/