2017.03.08

Hello Paul + Jose,

related to the use of glow plugs please have a look at the enclosed SAE
paper (2002-32-1791) - looks like a "compilation" of 2001-01-1894 + the old
941028.

If you're interested, you can search for the following patents by Pratt +
Whitney:
 EP 2551448
 EP 2811135
 US 2014/0360456
 US 2015/0337726

I don't know, whether P+W is already testing (or producing ?) any RE -
perhaps for military use only ...

c/o Jose ...
If there are any diagrams or tables embedded in your SAE paper (930680) -
perhaps you can send some screenshots of it ? Would be nice to see some more
details ... ;-)

It's true, what you've said about temperature + HC. One of the main
challenges with Wankel rotary engines ...

Of course, with homogeneous charge there's a limit, how "hot" a part (e.g.
the rotor flank) is allowed to be - we don't want any preignition ...

When working with direct fuel ignition, there's a chance to use a rearly hot
isolated insert in the rotor flank, that could help to vaporize the fuel
spray droplets ...

As well, with DFI you can stratify the charge - e.g. you can apply only air
in the trailing section, because the S/V ratio on the trailing side is
pretty bad until you've reached may be 90 deg aTC. But then the chamber
volume is extended so much, that the "after burn" is rather useless -
perhaps good for lowering the emissions ... - so, air only at "T" is a good
idea ... ;-)

There's an (old) idea by Paul for supplying additional air on his web site,
see "History of stratified charged rotaries" ...

And you can search for the thesis
"CFD Investigations of Mixture Formation, Flow + Combustion for Multi-Fuel
Rotary Engine" (2009, Izweik, 6,32 MB) + the related patent US 7500461 ...


Ok, that's enough "small talk" today ... ;-)

With kindest regards + "Salut"

Franky / Frank Herfert


"History of stratified charged rotaries" . What is the title of that paper Frank?
I can't find it on my own web site :-)


Paul Lamar

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