cranfield0007

effect control three dimension rough boundari layer transit superson speed experi perform superson wind tunnel jet propuls laboratori california institut technolog investig effect three dimension rough element sphere boundari layer transit tain local mach number vari trip size posit space reynold number per inch result indic transit laminar turbul flow induc three dimension rough element begin doubl row spiral vortic trail element contamin break surround field vortic transit appear rather suddenli becom violent increas rough height rel boundari layer thick breakdown vortic field strength spiral vortic may still persist sublay ensu turbul flow later space rough element littl effect upon initi breakdown contamin laminar flow trip reynold number veloc kinemat viscos outer edg boundari layer rough height transit occur rough posit vari posit reynold number one fourth power viz trip posit