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


Hello Paul, I think of Austro Engine because at the end of the first paragraph of the Introduction the Austro Engine Company is called the research partner of the Technical University of Vienna ... If you have a look at table 2, the Vc is 404 cc - exactly the volume, Austro engine has given in the description of 2009 - please see the enclosed screenshot. It must be an existing engine, because they have it run on a test bed ... But the 407 cc engine from the Wankel AG has a width of 6,5 cm, not 7,44 cm. So I've guessed, that it's the AE75R prototype ;-) Perhaps there is yet another engine of this size - of course I do not know all RE in the world today ;-)

But I think, that it's not very important, which engine they've analysed in Vienna.
Their work is rearly serious - without "pink glasses".

It's a good base for further development ...


I have a "strange" idea related to the trailing section problem - perhaps I will try to explain it with Paint, although I think, the mechanics will not work / will not be feasible ... ;-)

Yours very truly - I wish you a perfect start into the new year

 Franky / Frank Herfert

I was at the Austro engines factory in 2001.
Here are some pictures.

Paul Lamar


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