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 Keywords
- Supersonic aerodynamics
Date of Defense 1990-12-31 Availability unrestricted AbstractTwo 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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