Title page for ETD etd-41298-124436

Type of Document Master's Thesis
Author Xillo, Olivier III
Author's Email Address xillo@aoe.vt.edu
URN etd-41298-124436
Title A Sampling Probe for Fluctuating Concentration Measurements in Supersonic Flow
Degree Master of Science
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Schetz, Joseph A. Committee Chair
Ng, Fai Committee Member
Simpson, Roger L. Committee Member
  • Fluctuating
  • Supersonic
  • Concentration
  • Measurements
Date of Defense 1998-04-24
Availability unrestricted
The study of mixing processes in supersonic flow has a great

interest for a number of applications including scramjet

developments. However, the usual tools employed are very

limited. Sampling probes generally have a poor frequency

response, and that makes measurements of fluctuating

concentration problematic. The goal of this study is to

design, build and test a probe capable of measuring

concentration fluctuations of at least 1 kHz. This study

shows the design of such a probe and how a high frequency

response was achieved. A prototype was built and tested.

The tests consist of a calibration phase and experiments

inside a hypersonic wind tunnel. These last tests served

two purposes. The first one was to verify that the

measurements made with the probe gave the correct value of

the concentration. The second purpose was to assess the

frequency response of the probe by putting it through a

concentration step change. Tests were conducted with

various known mixtures of Helium and air from 0% to 100%

flowing at Mach 2.0 with Tt=300 degree K and Pt=4.4 atm.

The probe proved capable of measuring concentration

fluctuations up to approximately 2.5 kHz while also giving

the adequate accuracy for values of mean concentration.

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