860616 R. Kamo, R. M. Kakwani, W. Hady ABSTRACT A new generation of
Wankel rotary engines that can offer multifuel capability, increased
fuel economy, and improved performance and reliability could have a
profound influence on the design of future power plants for
aircraft, automotive and other applications. ...The recent advances
in adiabatic diesel engine technology have potential to improve the
Wankel rotary engine. In this paper, the potential benefits of
adiabatic Wankel engine and advanced concepts like- advanced
turbochargers, high compression ratio, faster combustion, and
reduced leakage have been assessed. ...In this paper, the potential
benefits of adiabatic Wankel engine and advanced concepts like-
advanced turbochargers, high compression ratio, faster combustion,
and reduced leakage have been assessed. A Wankel simulation model was
used to predict performance of the adiabatic Wankel engine with
these advanced concepts- predicting an overall improvement of 25.5%
in BSFC and 34.5% in power output.

Jose Gros-Aymerich

Madrid, Spain


"an overall improvement of 25.5% in BSFC and 34.5% in power output"

Pure BS!!!!  ROFL

A 5% improvement would be a monumental achievement!

Paul Lamar


This document on adiabatics?

Steve Carlisle

Wrong Authors.  860616 looks like an SAE number.

This one is a NASA paper.

The problem with coatings is they tend to come off.

Now if we had a solid silicon nitride rotor that would really be
something :-)

Paul Lamar


Silicon oxynitrate die-cast will work as a rotor face if held in a 2
piece hub. Some newer options are alloyed with metals to subdue the
brittleness. Not cost effective yet. Also can be bought as plate
stock, works as inserts in the side housings held in carbon fiber.

Under heat the carbon shrinks almost none and the si is very stable.
I expect it will hold together nicely. We shall see...

-------------------------------------------------------------

3D printed ceramic latice.May not be keeping heat in but it sure
tells it where its not to go. Serious air cooling. The printers are
now under well $1000. And desk top size.

michael Nash

How long would it take to 3D print a Mazda rotor out of this stuff?

What would be the tribology situation  between this stuff and the
silicon nitride seals apex seals ?

What are the mechanical properties at 700 F ?

Paul Lamar

they talk about Silicon Carbide at this link,

http://gizmodo.com/new-3d-printing-method-creates-ceramic-strcutures-that-1750877894,



could the process od 3D printing this to side housings, and then be
ground ?

Steve Carlisle

That is good sign Steve :-)

Maybe a silicon carbide rotor is not out of the question. Hughes
Research Labs are in my neck of the woods.

I'll see if I can find more information.

Paul Lamar


How about this approach for rotor manufacture?  It's pretty well proven in
turbochargers.
https://www.jsae.or.jp/autotech/data_e/12-5e.html#top

Gary Knutson



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