Implementation of a Rotary Engine (Wankel Engine) in a CFD Simulation
Tool with Special Emphasis on Combustion and Flow Phenomena
2015-01-0382  Published 04/14/2015

IMHO This is the best technical paper on the Wankel so far.

Frank Herfert  found it. Thanks Frank.

"In summary, the loss analysis shows that the main losses of the
Wankel engine result from the protracted and retarded combustion.
Consequently, the wall heat losses are lower than expected. "

" The mechanical losses, as well as the gas exchange losses, are
lower than comparable conventional spark ignition reciprocating
engines. The comparison between the investigated Wankel engine and a
normally aspirated, throttle-controlled gasoline engine with port
fuel injection under full load and high revolutions, is illustrated
in Figure 37."


"The largest deficits of the Wankel engine can be found in the area
of combustion (implementation loss due to incomplete implementation
of the fuel and combustion loss ) and leakage loss. The lower wall
heat release loss , compared to the conventional gasoline engine,
results from the late and delayed combustion. The lower mechanical
losses and charge exchange losses arise from the port control and
consequently, absence of the valve train."

What they did not investigate was multiple sparks  on the same spark
plugs or more spark plugs. In effect, unlike a piston engine, the
combustion travels past the spark plugs. In a piston engine the
combustion moves away from the spark plugs some what.

That is where my new high speed CD ignition system comes in to play.
It is capable of firing the plugs six  times.....five  degrees apart
at 8000 RPM. Patent is still pending.

It can be tested now, on a dyno, using multiple MSD capacitor
discharge ignition systems fired by a high speed computer 5 degrees
apart at 6 to 8K RPM.

I do not have a dyno to test this but I can supply the control
computer. Simon Saba has a rotary engine dyno in northern
California. Please Simon, see if you can get the money to try this.

Paul Lamar


Hi!: as discussed, I requested Kevin Landers, from
RotaryResurrection, to implement the Fujikawa, Kawasaki, combustion
promoting improvement plug hole triangular extension, pointing to the
trailing side of working chamber (Patent 3848574, of 1974), but it
took over one year for the tuned 1987 13B NA the engine to arrive
from NJ to Barcelona, and it's still pending to be installed in my
1976 AMC Pacer Sedan, along with a Mazda RX-7 four speed plus reverse
automatic transmission, if the project is concluded, I'll try making
a comparative test with an ordinary 6-L 4.2 liter AMC Pacer, and let
you know results.

Thanks, have a nice 2017, best regards, + Salut †

Jose Gros-Aymerich

E-28033 Madrid, Spain

I don't think you will learn much Jose.

The best BSFC islands are in entirely different places for the Pacer and the RX7.
The Pacer has much more frontal area and the drag coefficient is much higher
than the RX7.

Paul Lamar


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