 downstream influenc mass transfer nose slender cone downstream influenc mass transfer nose slender cone influenc local mass transfer nose slender cone hyperson flow condit studi experiment theoret gaseou coolant nitrogen helium inject porou plug subtend half angl 30 mass transfer shock shape pressur distribut heat transfer transit investig experiment work involv test mach-number-8 0 tunnel pibal theoret analysi involv studi mass transfer shock stand-off distanc lead inviscid-flow paramet permit experiment determin shock shape pressur distribut extrapol test condit coolant gase maximum paramet alter pressur distribut cone defin flow boundari-layer-type similar appli reduct heat transfer inject small amount helium inject peak heat occur downstream cone order magnitud occur stagnat point mass transfer nitrogen earli transit occur local heat rate increas prevail reynold number inject 