Title page for ETD etd-12232009-020346

Type of Document Master's Thesis
Author Ninnemann, Todd A
URN etd-12232009-020346
Title Aspirating probes for measurement of mean concentration and fluctuating quantities in supersonic air/helium shear layer
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Ng, Fai Committee Chair
Roe, Larry A. Committee Member
Schetz, Joseph A. Committee Member
  • Supersonic aerodynamics
Date of Defense 1990-12-31
Availability unrestricted
Two aspirating hot-film probes are developed to make measurements in supersonic

air/helium shear layers. The first probe is designed to measure local mean gas

composition and is referred to as the mean concentration probe. This probe consists of

a constant temperature hot-film sensor operating in a channel with a choked exit. The

flow over the hot-fifm is influenced only by total temperature, total pressure, and gas

composition. The mean probe is easily calibrated and shows acceptable sensitivity to

flow angularity. The second probe is based on an improved design of the mean

concentration probe. In addition to measuring mean composition, this second probe also

measures turbulence intensities of Reynolds number and thermal conductivity using a

multiple overheat method. This probe is referred to as the turbulent probe. Both probes

are used in the study of supersonic air/helium mixing layers in the VPI&SU 23 cmx23 cm

Supersonic Wind Tunnel. Profiles of mean and turbulent quantities are presented.

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