Accession Number : AD0657772

Title :   AIR AND NITROGEN CONDENSATION IN HYPERSONIC NOZZLE FLOW,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Daum,Fred L. ; Gyarmathy,George

Report Date : MAR 1967

Pagination or Media Count : 67

Abstract : Earlier experimental air condensation results were extended to lower pressures and higher Mach numbers where it was found that air behaves essentially as pure nitrogen and large amounts of supercooling are obtained. A theoretical analysis, based on established drop growth and self-nucleation concepts, supported the experimental findings. A correlation parameter governing the onset of condensation is presented. The analysis indicated that at the higher static pressures, where little or no supercooling is observed experimentally, the seemingly negligible amounts of CO2 and H2O in the wind tunnel air are sufficient to cause O2 and N2 condensation through a seeding action. A new method is presented for determining a conservative value of minimum stagnation temperature for obtaining condensation-free hypersonic flow. (Author)

Descriptors :   (*NOZZLE GAS FLOW, *CONDENSATION), (*AIR, CONDENSATION), (*NITROGEN, CONDENSATION), (*HYPERSONIC FLOW, CONDENSATION), NUCLEATION, HYPERSONIC WIND TUNNELS, SUPERCOOLING, STAGNATION POINT, OXYGEN, CARBON DIOXIDE, WATER

Subject Categories : Aerodynamics
      Physical Chemistry
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE