 mix free axial-symmetr jet mach number 1 40 mix free axial-symmetr jet mach number 1 40 axial-symmetr superson fulli-expand jet diamet 0 75 mach number 1 40 issu atmospher rest investig schlieren shadow photographi pressur travers develop jet depend critic strength shock wave core jet nozzl exit strong shock wave jet spread rapidli unsteadi jet case break larg eddi size diamet jet disturb core jet spread gradual jet slight unsteadi turbul mix region jet strong shock wave investig detail pitot tube inch correspond two-dimension half-jet veloc profil well repres error integr rate spread half low-speed flow integr mix region entrain loss kinet energi determin quantiti agre well valu estim assum error-integr veloc profil 