DSR3 Core Clearance in Bell

[foxtatic]

I am finalizing a brick bell design powered by a 6" DSR3 core. One constraint I have is the depth of the bell (distance front to back.)  Bell would be 60 inches long inside, as close to 24 inches deep as possible, and height would adapt to ISA requirements.

Core would go in the long face of the bell. There would be lots of space on both sides, above, and below the core... but not much room BEHIND the core. The would be the one restricted point. So assuming at least 12 inches of clearance on all sides except behind, how close can the back of the core be to the back wall of the bell? 

[peterberg]

Good question. I checked the 5" development model which is still in one piece. At the back there's about 7" space, but I'd think 2" would be OK as well since there's lots of space left and right. The hot gases will move upwards with high velocity immediatly above the core. Meeeting the ceiling, the stream is directed to the front and down after that. If you get the picture, the spacing at the rear isn't important, since the overall space you mentioned is plenty. One effect of this arrangement is that the front will warm up quickest although the difference won't be enormous.

[foxtatic]

Thanks Peter, great to know! Now if I can find the time to build the thing before winter sets in... 

[skywalker]

We’ve build several DSR3’s and almost none of them have space behind the core. We just build the back wall of the stove straight away against the core. There is only 25 mm ceramic fibre between back of the burning chamber and outside wall.