Dear Mr Paul Lamar,
i've seen, that you are interested in ignition systems.
Perhaps the following SAE paper ist nice to read (unfortunately I do not
have this paper ...): No 2015-01-0007 by Alberto Boretti et al, dated
2015-03-10 - quite new ... :-)
Hoping, the little information will help you
Yours sincerely
Frank Herfert
(Germany)
Thanks for the tip.
Paul Lamar
An Abstract is here:
http://profiles.sae.org/79718499737/
Rolf Pfeiffer
This is running on hydrogen. Hydrogen will ignite over a wide range of
fuel air mixtures unlike gasoline. Therefore it is inapplicable to the
real world. Show me results with gasoline. The world is now swimming in oil.
Paul Lamar
Not sure if hydrogen is that inapplicable, but that would be off-topic.
It seems to work with gasoline:
http://www.mahle-powertrain.com/en/mahle-powertrain/mahle-powertrain-projects/turbulent-jet-ignition/
Poul Woefle
Unfortunately that will not work with a rotary as it extends down into
the combustion chamber.
As soon as I get back from Oz Poul I will send you a system. I need a
dwg of the front of your e-shaft to make a new trigger disk.
Paul Lamar
A modified pre-cup that does not extend into the rotor housing to
interfere with the apex seal could work. This is a modification of the
older diesel engine pre-cup injection systems. Emissions concerns
stopped their use. Case and Caterpillar are two I know of that used
this. In the pre-cup enough fuel is injected to initiate a sustainable
flame front which then comes out of the hole or holes into the main
combustion chamber/cylinder pretty much as a plasma.
With modern fuel injection, multiple injections can be made per
combustion event which can extend the duration of the ignition event.
This plasma will start a much too lean mixture in the cylinder
/combustion chamber than could normally be ignited. Stratified charge
system. Could be promising combined Mazda's Sky activ technology.
Caterpillar had to have steel buttons in the piston crown to stop
eroding a hole due to the aluminium getting soft from the heat. Some
times the pistons had heat cracks radiating out from the button. Case
used a different approach in that they fired the injector through a
single hole across the combustion chamber into the pre-cup where it
started the burn.Then the flame came roaring out into the main chamber
not being aimed at the piston.
With a rotary engine with cast iron rotors this could work as the rotor
would not be as prone to damage. Possibly TiAl rotors would work to
assist in higher RPM capability.
Dale Davies
Hey Paul,
no need to design a disc for us. Just send what you have and we'll go
from there.
I agree with Dale Davies that a modified system would indeed work for a
rotary. Obviously more complex than a conventional spark plug, and to be
determined whether it's that much better than a multi-spark, but if they
can burn ultra-lean fuel like this I think the concept is really
interesting.
Poul Woefle
The disk must be at least 3.5 inches in diameter and .062" thick.
The hole circle must be at least
3.25 inches in diameter. The hole size must be .060" +- .010". The holes
must be
at least 5 degrees apart. This is for a one rotor. Max number of holes
is six.
For a two rotor there are other requirements.
The new system does not need a computer to control it.
The spark pattern programming is done by the disk.
You will need a optical trigger device from me and that runs off a 12
volts supply.
The two units are connectged by SMA miniature coax cable.
Paul Lamar
The Rotary Engine News Letter. Powered by Linux.
If you want off the list PLEASE let me know and I will
remove you. ACRE NL web site.
http://www.rotaryeng.net
You Tube
http://tinyurl.com/beqqxas
Copyright 1998-2015 All world wide rights reserved.