snips....
The stuff presented here is up to date Joe. This is from the latest info
available. The Heisler book was published in 1995. By technical book
standards that is up to date. As I said there have been no major
breakthroughs
in 50 years since the turbo compound. I don't consider electronic injections
systems and high rear axle ratios major break throughs. This goes for all
kinds of
IC engines.
Except perhaps the wankel. The electric assisted turbo charger IMHO is
perhaps going to be a major breakthrough. I think you might see some
reduction
in the displacement of economy car engines further improving the city
mileage.
As far as a diesel wankel is concerned the wankel geometry is incapable of
maintaining a useful combustion chamber shape and still reach the
compression
ratios necessary for true diesel operation. That is not to say they won't
run on diesel fuel however. They will but you won't get the diesel BSFCs.
snips....
Paul Lamar
snips....
I question your premise about the rotary Paul. Do you have any pictures of
the rotor Wankel used on there diesel? I believe the combustion chamber
shape was not optimum for a modern diesel. Have you seen a TDI piston? I
imagine something similar would work for the Wankel.
snips...
All you need to do is look at the wankel geometry. The current Mazda
is about as good as you can get for an acceptable combustion chamber
shape. Probably ANY deviation to raise the compression ratio will
destroy what little is left of the combustion chamber. There is no
room in the rotor for any kind of spherical combustion chamber.
Find a used copy of R.F. Ansdale's book "The Wankel RC Engine". He will
explain the hundreds of configuration Felix went through before he came
up with the current configuration. Prior to ISBN. Library of congress
card number 69-18692. A.S. Barnes and Company.
Juergen Bax president of Wankel Gmbh gave me
an original technical paper in color and large format that Felix
presented to the German engineering society outlining hundreds of these
configurations.
Paul Lamar
Paul,
So trying to run the rotary on diesel most efficiently we are basically
looking at exploring optimum boost levels, eliminating turbo lag and
confirming timing sequence. Probably a different choice or new design of
injectors is called for. Ditto spark plugs. All of these aforementioned
areas would benefit enormously by having a diesel guru. I am still
searching for him or her.
When the student is ready the teacher appears huh? :)
Possibly the injector position might have to be in the direct 11:30 position
that the new engines reserve for hydrogen use as the volatility of diesel is
different than gasoline. This can be found out trial and error. Lots of
variables. Time to start narrowing them down. As I understand it turbo
compounding would be an additionally merit to enhance the BSFC in the 3K to
4K rpm cruise range. Francois feel free to jump into this conversation at
any time now:)
Thanks
Doug
Turbo lag is not a problem if it is aircraft you are interested in.
TC at 3k to 4K would be for car use. For AC use you want 5K to 6K.
Contact Bosch and get a catalog of diesel injectors.
I think common rail is what Wankel Gmbh used. Either that or unit pump.
http://www.kraftfahrzeugtechnik-heute.de/k/en/start/product.jsp?mfacKey=ds_22_comrail_allg
http://www.kraftfahrzeugtechnik-heute.de/k/en/start/product.jsp?mfacKey=ds_24_comrail_injk
Unfortunately all that info and data that Wankel Gmbh acquired
at great expense appears to be lost forever. The company was for sale
for awhile but I don't know the current status.
Maybe Bosch will recommend a flow spray pattern for the Wankel.
Paul Lamar
Does not look cheap or easy. Could take a lot of trial and error
with a dyno. I know Wankel Gmbh and Curtiss Wright worked on it for years.
How are you doing Francois?
Paul Lamar
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