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Sorry, just read the scarbsf1 link. It's not right. A diffuser IS named appropriately, does NOT actively scavenge airflow and does NOT reduce boundary layer thickness. That last point is the exact opposite of what actually happens - the adverse pressure gradient in the diffuser causes the boundary layers to thicken and is ultimately the limiting factor on how steep you can go. They've made a good effort but the information is misleading.
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