A cryogenic wind-tunnel experiment to study the similarity rule for the jet-temperature effects on the transonic base pressure

Research output: Contribution to conferencePaperpeer-review

Abstract

On the basis of the similarity rule for the jet interaction, a hot jet can be simulated in a cryogenic wind tunnel with a test gas at ambient or moderately-elevated temperatures. By using this approach, jet-temperature effects on the transonic base pressure of a cylindrical afterbody model has been investigated in the NAL 0.1m Transonic Cryogenic Wind Tunnel. Gas mixtures of nitrogen and either of methane, argon, or helium at varying temperatures were used as a jet gas to determine separate effects of jet temperature, specific heat ratio, and gas constant It has been found that data obtained for various jet conditions can be correlated very well with the two similarity parameters; the plume maximum diameter for the plume shape effect and the jet to free-stream mass flux ratio for the jet entrainment effect To verify this similarity rule, the same model was tested in an ambient wind tunnel. It was found that an ambient temperature gas having low molecular weight could simulate the jet temperature effects on the transonic base pressure.

Original languageEnglish
Publication statusPublished - 1994 Jan 1
Externally publishedYes
EventAIAA 25th Plasmadynamics and Lasers Conference, 1994 - Colorado Springs, United States
Duration: 1994 Jun 201994 Jun 23

Other

OtherAIAA 25th Plasmadynamics and Lasers Conference, 1994
CountryUnited States
CityColorado Springs
Period94/6/2094/6/23

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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