VIBRATIONAL RELAXATION OF NITROGEN IN THE NOL HYPERSONIC TUNNEL NO. 4

Abstract

The problem of vibrational relaxation of nitrogen was analyzed for supply conditions of 3600R, 3960R, 5400R, and pressures of 80 and 100 atmospheres. A comparison between equilibrium, relaxing, and frozen flows was made for flow in the nozzle and around a pitot probe placed in the flow. The results are shown as plots of static pressure, static temperature, free stream velocity, and stagnation pressure ratio versus nozzle area ratio. It was found that the flow freezes at very short distances downstream of the throat. When plotted versus nozzle area ratio, the ratio of impact to stagnation pressure gives identical results in the relaxing and frozen flow cases.

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Document Details

Document Type
Technical Report
Publication Date
Apr 17, 1964
Accession Number
AD0601590

Entities

People

  • E. L. Harris
  • Lorenzo M. Albacete

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Equations
  • Flow
  • Free Stream
  • Hypersonic Nozzles
  • Lepidoptera
  • Mach Number
  • Munitions
  • Nozzle Area Ratio
  • Nozzles
  • Ordnance Laboratories
  • Relaxation Time
  • Shock Waves
  • Stagnation Pressure
  • Static Pressure
  • Test Facilities
  • United States
  • Vibrational Relaxation

Readers

  • Fluid Dynamics.
  • Industrial Economics
  • Spectroscopy.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flight
  • Hypersonics - Hypersonic Flow