[Stoves] ***SPAM*** burning wood gas

[Harris, Kirk]

Daniel,


Thank you for your response and question.


Currently I am experimenting with various configurations for the bluff 
body.  A trailing edge is one possibility to try.  The flat top bluff 
body causes vortexes directly above it.  The vortexes do not seem to 
help or hurt in the overall performance.  A trailing edge might 
eliminate most of these, and perhaps could reduce flow resistance.  
Using descending tubes from the bluff body (as I described in an earlier 
contribution) to let air enter the interior of the flame above the bluff 
body seems to reduce the vortexes and feed air to the interior of the 
flame as well.  This helps with both high and low power levels.

Attached are photos of some of the bluff body designs I have tried.  
They are upside down in the photos.  The ones with "petals" are intended 
to create rounded lobes of flame, and the partial tubes create a narrow 
open space between the lobes of flame.  This may (I don't know yet) 
allow air into the interior without the tubes.  Both tubes and partial 
tubes seem to perform similarly, and help enable the very high and very 
low power levels.


Were you thinking of a cone shape for the trailing edge?


Kirk H.



On 7/16/2021 8:03 PM, Daniel Pidgeon wrote:
> I love your work, Kirk!
>
> I quite liked the details I saw in the spec sheet of the three hour 
> TLUD you put out a while back, and am looking forward to putting a few 
> concepts from there into a build, when I can get to finishing it.
>
> Since childhood I have admired the impact a wing shape has on the air 
> around it and been interested in flight, and was intrigued by "the 
> Venturi effect" that you talk about which I had never heard of before 
> reading your work, but it only just struck me today that the two are 
> very connected. Just spitballing as I go, would there be merit to your 
> "bluff body" having a "trailing edge" like a wing does, rather than 
> just a flat top? I have nothing to go on asking this, and no 
> suggestions, just a thought that occurred. I don't know how much 
> harder this would be to make.
>
> Daniel
> ------------------------------------------------------------------------
> *From:* Stoves <stoves-bounces at lists.bioenergylists.org> on behalf of 
> Harris, Kirk <gkharris316 at comcast.net>
> *Sent:* Saturday, 17 July 2021 5:50 AM
> *To:* Discussion of biomass cooking stoves 
> <stoves at lists.bioenergylists.org>
> *Subject:* [Stoves] ***SPAM*** burning wood gas
> All,
>
> I have been working on a document on a subject which is quite
> fascinating to me.  I thought I would share it with you even though it
> is unfinished.  It probably will never be finished as I find that each
> idea leads to more ideas.  I might as well share where I am now.  As I
> proceed, there will be more drawings and photos of the test stoves and
> components.  I hope there will be questions because questions make me
> look at things I have not paid attention to before.  Dean Still's
> questioning has been very helpful.
>
> I hope you enjoy it,
>
> Kirk H.
>
>
>
> -- 
> This email has been checked for viruses by AVG.
> https://www.avg.com <https://www.avg.com>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://stoves.bioenergylists.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20210717/43a9b0f3/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: burning wood gas bluff bodies.docx
Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
Size: 190223 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20210717/43a9b0f3/attachment.docx>