Hi Ebajoy 
I created a simple little “flame” object , much like a “Splat” made of an cross of two shaped vertex planes (see pic)
I also created a couple of Morphs to vary the shape, and use the “noise” tweener to make it more random during the animation.
that makes the basic flame / jet thing, but I also added a particle emitter, to create the “bit’s” that fly out and fade.
Hope it helps 