Check out http://www.booleansoup.com and hit their message boards. There's a Fenix board, and they're VERY helpful with such questions.
You can also grab the source code for my game, Primitive Nightmare, at http://www.fusekigames.com. There are blocks of code that deal with explosion animations that might be able to help you (look for the expl() and pl_expl() processes).
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