I was thinking about stratified charge by high pressure
    air injection as long ago as 1975. I am still waiting
    for Mazda or somebody else with the where with all to
    try it.

    http://www.rotaryeng.net/Strat-charge.html

    Paul Lamar ...No rotor no motor.


Paul,
 This was one of the reasons I have been trying to secure parts for
direct injection. Orbital's system does pretty much the same thing,
using a similar technique. They "pre-stage" the fuel charge using a
standard style injector followed by an air blast assisted secondary
injector. On the Mercury outboard engines the air pump is engine driven
and is also an oil pump for the 2-cycles. This might be a perfect
combination for the rotary, but Orbital only wants to deal with big
OEMs. They suggested several secondary sources, but everything costs
twice as much that way. Their attitude is unfortunate shutting out most
private endeavors. They even built a spark plug/injector combo for GM but
gave up on it. It might be bolted directly into the trailing plug hole
for an instant conversion. Alas they wanted $10K for even a preliminary
collaboration, way to rich for me!
Still trying, but probably through other manufacturers.

Bill Jepson

As I said in a later message. (Keep reading) Piston engines are one thing
the rotary is another. Plenty of people have tried direct
fuel injection and failed to improve the BSFC.

High pressure air only has not been tried as far as I can find.
IMHO that is the most promising approach.
It is not going to be easy as the possible combination are many.
You are going to have to drill a lot of little holes in rotor
and end housings at different angles.

Perhaps the best thing is make a Plexiglass model
of the Wankel and drive it with an electric motor and blow smoke.

Plenty of studies have been done on how the flame front
moves inside the combustion chamber. I think I have a tech paper
at the house where CFD was used. I'll try to find it in
the next couple of days.

The flame propagates forward in the same
direction as the face of the rotor is moving because that
part of the chamber is increasing its volume. Don't forget
this is a rotating combustion chamber engine. The back
part of the combustion chamber never burns so you
need nothing but fresh air back there. Too flat and too cool.

Perhaps several fuel injectors located along the combustion
chamber path each one supplying only part of the fuel needed.
As far as I know nobody has tried that either.

Another possibility
is keep firing the rear plug until the apex seal gets there
with a multi spark capacitor discharge ignition system.

Paul Lamar ...No rotor no motor.

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