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Some say it's primarily for reducing noise :
Quote:
Originally Posted by Sayyad
The image I've attached is that of the engine of a 787 Dreamliner. The guy who worked on the sawtooth design wrote that it reduces noise. This means less energy wasted energizing air to produce that noise. I'd guess that there would be small vortices forming at each point on the trailing edge, but that all the vortices combined would take less energy to maintain than a possible single large one trailing from a smooth trailing edge.
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Others say it's just a Batman thing,
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What *is* interesting is that the design has evolved. In the pictures above, it's on the external cowling only. In this picture it is also part of a second cowling closer to the exhaust :
CarloSW2