Accession Number : AD0715610

Title :   An Electron Beam Excitation Technique for the Measurement of Low Densities in Hypersonic Shock Tunnel Flows,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Zempel,R. ; Mallin,J. ; Muntz,E.

Report Date : FEB 1963

Pagination or Media Count : 22

Abstract : A moderately energetic electron beam (30 kev) is used to induce luminescence from the nitrogen molecules in a high speed gas flow. Local gas density may be measured from observation of the electroluminescent intensity. The method is ideally suited to low density hypersonic flows where, because the gas is so tenuous, the technique proves highly effective compared to shadowgraph or schlieren instrumentation. In the present case the technique was developed for the measurement of density in a hypersonic shock tunnel. The ability to make accurate, quantitative measurements of density is useful in probing a shock tunnel's free stream flow. Also, investigations of the flow in the near wake region of a model may be undertaken using the electron beam. (Author)

Descriptors :   (*HYPERSONIC FLOW, DENSITY), (*DENSITY, MEASUREMENT), ELECTRON BEAMS, SHOCK TUBES, EXCITATION

Subject Categories : Aerodynamics
      Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE