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

Keywords

Supersonic aerodynamics

Date of Defense

1990-12-31

Availability

unrestricted

Abstract

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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