I made two propane injection burners according to the USSR secret books (drawings). Drawings and calculations are attached. You can calculate a garelka of any size and power.
I really enjoyed your thrifty approach to making the burner, especially how you used the knot in the wood to help form the cone. Your set up is very basic but you made a great burner.
Normally the mixing tube's diameter expands as the gas/air mixes and exits a larger bell. I have never seen a return on the bell creating a chamber. This chamber must choke the gas and air to thoroughly mix them. I'm inspired to build one to try out and compare with my existing burners!
A little later, if you need me, I can put a link under the video in the description for a reference book on similar burners with examples of drawings and their calculations of similar burners for blacksmith furnaces and smelters. A 1981 book by a publisher, very rare.
The burner with such a constriction after the mixer has features, when the blowing air is completely open, the flame breaks away from the burner and because of this the burner remains cold. But the burner can only be used for furnaces, then it will work correctly.
I always use this gas burner in my blacksmith furnace, it is very economical and easy to manufacture.
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