Profile of an Anisentropic Nitrogen Nozzle Expansion
Abstract
Hypersonic N2 flow fields were produced using a conical nozzle of 1. 04-mm throat diameter and an exit plane area ratio of 13.4. The reservoir pressure was varied over the range of from 1.87 to 13.6 atm at the reservoir temperature of 285 K, and the reservoir conditions were such that both isentropic and anisentropic conditions existed within the axial region investigated. Axial and radial profiles of N2 number density and rotational temperature were measured using laser Raman scattering, and comparisons are presented with the method of characteristics isentropic prediction. The onset of condensation and subsequent cluster growth were observed using laser Rayleigh scattering and depolarization measurements as well as photographic recording. The Rayleigh and Raman scattering data were used to obtain estimates of the axial variation of the cluster size as well as the variation of the depolarization ratio with the mean number of molecules of the cluster.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1975
- Accession Number
- ADA004764
Entities
People
- J. W.L. Lewis
- W. D. Williams
Organizations
- Arnold Engineering Development Complex