|
Post by pinhead on Mar 10, 2016 5:52:54 GMT -8
This pic shows what happens if you don't shift the riser rearward slightly in relation to the port. The red lines show airflow. The green line shows how the riser will need to be rotated/shifted rearward to alleviate the situation. BASICALLY, you want the "back" of the riser to be perpendicular to the airflow.
|
|
|
Post by peterberg on Mar 10, 2016 7:04:12 GMT -8
Hmmm... I don't agree with you Pinhead, although it is just a minor difference. Yes, one side of the vortex will be stronger but not in the way you think it would be. This uneven situation will provide less thorough mixing as was clearly showed by the Testo gas analyzer. Experiments in Israel last November showed something different with a symmetrical riser/port setup. In this same situation, there still was a double vortex but the right hand part happened to be stronger all the time although there was no sign of a single vortex. Apparently, the flames on the right hand side of the firebox wouldn't cross over to the left hand side of the riser. A solution was obtained by placing the port in such a way that it was slightly off-center to the front, just a quarter of an inch. By doing this the right hand side of the riser became smaller and provided more space at the left hand side. This minor change made the vortex symmetrical again. Shifting the riser to the back and shifting the port to the front is basically the same thing. As you can see, it's the same solution although the problem is mirrored.
|
|
mudder
Junior Member
Posts: 50
|
Post by mudder on Mar 10, 2016 8:08:55 GMT -8
would a vertical tripwire beside the port even out the horn? what about a thicker/deeper port configuration?
|
|
|
Post by peterberg on Mar 10, 2016 11:36:27 GMT -8
Maybe a trip wire could do something, the same goes for a deeper port. But that need to be tested whether it is doing anything, positive or negative. At the same time: why making things complicated when there's a simple solution available, free of charge and proved to work?
|
|
|
Post by esbjornaneer on Mar 16, 2016 5:25:18 GMT -8
The reason for my questions is that I am needing to redesign the stove I build last year. I have space constraints (already in place when designing it) and now I was wondering if I would get away without needing to move the base of the FB. I have taken up tiles in the floor to get insulation under it and would have to take other tiles up to move the FB direction to get the HR where I think I needs to be to heat all aspects that I would like on my stove... I guess I should have listened to people saying that the stoves should be build to make one thing at the time. One for a hob, one for an oven and another for space heating.
|
|
|
Post by pinhead on Dec 23, 2016 8:25:15 GMT -8
I just uploaded this to Youtube so I thought I'd bump this thread and show off the stove a bit since everyone likes to watch fire burn. youtu.be/pWJGUREkT1M
|
|
|
Post by satamax on Dec 23, 2016 8:47:16 GMT -8
Pin, not working, it's a private vidéo.
|
|
|
Post by pinhead on Dec 23, 2016 9:56:58 GMT -8
Pin, not working, it's a private vidéo. Hmm I have it listed as public and I can see it on my Linux box... How about now?
|
|
|
Post by satamax on Dec 23, 2016 11:18:24 GMT -8
Working now.
|
|
|
Post by matthewwalker on Dec 23, 2016 12:35:47 GMT -8
That's hot, 600 on the face...she's doing just fine! I like that build Pin, nice little system there.
|
|
|
Post by pinhead on Dec 23, 2016 12:44:39 GMT -8
That's hot, 600 on the face...she's doing just fine! I like that build Pin, nice little system there. Thanks, it sure heats the space really well once it's up and running. Cold start can be a bit tough, is all - I should've built a bell bypass. Luckily it's in the shop so a little smoke out of the firebox doesn't hurt much. What kind of temperatures do you expect to see on the face of the barrel with a batch box running full-out?
|
|
|
Post by matthewwalker on Dec 23, 2016 14:51:36 GMT -8
What kind of temperatures do you expect to see on the face of the barrel with a batch box running full-out? Right about there is what I expect to see on one of those magnetic dealies when the stove is burning well.
|
|
|
Post by byronc on Dec 24, 2016 3:09:11 GMT -8
Pinhead, sounds like your stove is working similar to my 6" brick batch-box. The maximum I've measured on my barrel (IR'd at the same area as your magnetic thermometer) is 675° F., and 725° F. on the top/horizontal surface, at the peak of the burn. That's after running the stove to warm up the thermal mass bench.
|
|
|
Post by pinhead on Jan 6, 2017 10:51:23 GMT -8
I've pegged that meter before, burning well-seasoned hedge splits. The top third of the barrel was glowing red which could be seen with the lights out...
|
|
|
Post by gugaiz on Jan 12, 2017 20:20:03 GMT -8
Hi, great thread! Does anybody know if a barrel will last long enough as primary bell (i.e. on top of the riser)? peterberg says that anything above the riser's lever should be refractory and I was wondering how long will last a bare metal barrel, as I have seen in many configurations.
|
|