C.P. No. 1294 PROCUREMENT EXECUTIVE, MINISTRY OF DEFENCE AERONAUTICAL RESEARCH COUNCIL CURRENT PAPERS SLR Temperature Measurements in the Supersonic Expansion of Nitrogen in a Shock-Tunnel bY
نویسنده
چکیده
SUMMARY Temperature measurements, using the SLR method, are presented for the expansion of nitrogen in nozzles attached to a shock-tube. The measurements were made at an area ratio of 8.5 in a two-dimensional nozzle and at an area ratio of 152 in a conical nozzle. Initial conditions were such that at the entrance to the nozzles the temperature ranged between about 2500 K and 5300 K and the pressure between 1 atmosphere and 30 atmospheres. Temporal variations of temperature were found in the nozzle flow which are similar to those previously measured at the nozzle entrance. The apparent de-excitation rate of the nitrogen vibrational mode is up to 100 times faster than shock excitation data suggest.
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