When I was reading an article about scalloped and lobed mixers in turbofan engines nozzle, I faced with this sentence that was comparing lobed and scalloped cases: "impingement location for the scalloped mixer is further downstream than that of the lobed mixer". I searched for the mean of impingement and impingement location but I couldn't know what does it mean exactly for Streamwise vortices in a lobed or scalloped mixer. enter image description here

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