A turbulent air assist can make scorch marks worse, not better. 3D-printed nozzle to promote laminar air flow on the left, stock nozzle on the right.

A high Reynolds-number Mach-6 wind-tunnel nozzle has been designed for a new quiet-flow Ludwieg tube. The quiet-flow nozzle is designed to maintain laminar boundary layers on the nozzle walls as far ...

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