[Stoves] The time-temperature-turbulence equation

[Crispin Pemberton-Pigott]

Dear Jock

 

>When I read your "In the time-temperature-turbulence equation" lights went
off.  

 

I would rather hear they went on.

 

You are quite correct in your analysis, though be careful about generalising
on the other approach.

 

>I expect this is why my iCans with three washers as deflectors, in contra
distinction to a "concentrator ring", burn cleaner.

 

Correct, with the proviso that the concentrator ring could be better it is
broke the incoming (lateral) flow towards the centre into jets. The point is
to get turbulence while not shortening the residence time 'at temperature'.
The easiest way improve the concentrator ring is not to have one in the
first place, but to create the same effect using hot secondary air jets. The
result is you can drop fuel in without hindrance and there is one less part
to make.

 

If the ring is a necessity, make it using a concertina-forming tool so the
gas flow is divided. Anything to make it not be a smooth flow like water
going down a round hole with a radiused edge.  

 

This is particularly important when the excess air level is low because it
is hard for the H and C to find O2 when it is in short supply without
turbulence.

 

>They are essentially soot free.  Perhaps "soot free" should be a goal?

 

Correct again. 

 

Regards

Crispin

 

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