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I. Design and application of piezoceramic transducers to transient pressure measurements. II. Some measurements of curvature and thickness of reflecting normal shocks at low initial pressures

Citation

Johnson, Douglas S. (1962) I. Design and application of piezoceramic transducers to transient pressure measurements. II. Some measurements of curvature and thickness of reflecting normal shocks at low initial pressures. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-12222005-102730

Abstract

A small pressure transducer, using the piezoelectric properties of a manufactured ceramic, was designed, constructed and installed in the end plate of the GALCIT 17-inch shock tube to obtain high-speed measurements of the pressure field behind a reflecting shock.

The design problem for piezoceramic pressure transducers and some possible solutions are discussed in detail. Results of transducer calibration and recommendations for improvement of the instrument are presented.

An initial program to determine the curvature of a shock at low initial pressures was run concurrently with calibration of five of the above pressure transducers. The results of this program are described in as much detail as the data obtained to date will permit.

At an initial pressure of 30 microns in the GALCIT 17-inch tube, the shock obtained at a Mach number of about 7.5 in argon is observed to have a total curvature of approximately 10 millimeters, or approximately two per cent of the tube diameter. The shock thickness observed under these conditions is approximately 5 millimeters. These results indicate that it may be entirely possible to obtain good optical measurements inside the shock, but that it may be necessary to resort to special techniques to avoid optical distortion caused by curvature.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Liepmann, Hans Wolfgang
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1962
Record Number:CaltechETD:etd-12222005-102730
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-12222005-102730
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5118
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:22 Dec 2005
Last Modified:26 Dec 2012 03:15

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