im having a little trouble understanding how a simmer ring on a penny alcohol stove is supposed to work. i assumed the idea was to restrict the flow of vapor, reducing the flame. in the past, when ive tried to use a simmer ring, the flames stayed roughly the same, just funneled toward the center, and the simmer ring burned up.

ive also tried reducing the number of jets to make a designated simmer stove, but instead of twelve 1" high flames, i get six 2" or 3" flames.

can any of you helpful folks explain the physics of a simmer ring, or maybe point me in the right direction?

He who makes a beast of himself gets rid of the pain of being a man.
-Samuel Johnson