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

Keywords

Fluctuating
Supersonic
Concentration
Measurements

Date of Defense

1998-04-24

Availability

unrestricted

Abstract

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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