 investig separ flow superson subson stream emphasi transit investig separ flow superson subson stream emphasi transit experiment theoret conduct flow separ associ step base compress corner curv surfac shock-wave boundari-layer reflect configur produc lead-edg separ pressur-distribut measur shadow-graph observ high-speed motion pictur oil-film optic maximum scope measur encompass mach number 0 4 3 6 length reynold number 4000 5000000 princip variabl control pressur distribut separ flow locat transit rel reattach separ posit classif separ flow three regim turbul transit upstream separ classificaiton liter steadi flow influenc reynold number regim pure laminar separ theori calcul dead-air pressur advanc agre well subson superson experi theori involv empir explan transit locat rel reattach simpl analysi equat interact boundari-layer extern flow laminar turbul separ indic pressur rise vari squar root wall shear stress interact experi substanti tni variat test condit incident observ stabil separ laminar mix layer increas markedli increas mach number signific observ discuss 