VIBRATIONAL RELAXATION OF NITROGEN IN THE NOL HYPERSONIC TUNNEL NO. 4
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination or Media Count:
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.
- Test Facilities, Equipment and Methods