Reflected shock tunnel noise measurement by focused differential interferometry

N. J. Parziale, J. E. Shepherd, H. G. Hornung

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

45 Scopus citations

Abstract

A series of experiments is conducted where a quantitative non-intrusive optical technique is used to investigate disturbances in the free-stream of T5, the free-piston driven reflected shock tunnel at Caltech. The optical technique, focused laser differential interferometry (FLDI), measures fluctuations in density. In the test matrix, reservoir enthalpy is varied while the reservoir pressure is held fixed. The results show the perturbations in density are not a strong function of the reservoir enthalpy. During one experiment, exceptional levels of noise were detected; this unique result is attributed to non-ideal operation of the shock tunnel. The data indicate that rms density fluctuations of less than 0.75% are achievable with attention to tunnel cleanliness. In addition, the spectral content of density fluctuation does not change throughout the test time.

Original languageEnglish
Title of host publication42nd AIAA Fluid Dynamics Conference and Exhibit 2012
DOIs
StatePublished - 2012
Event42nd AIAA Fluid Dynamics Conference and Exhibit 2012 - New Orleans, LA, United States
Duration: 25 Jun 201228 Jun 2012

Publication series

Name42nd AIAA Fluid Dynamics Conference and Exhibit 2012

Conference

Conference42nd AIAA Fluid Dynamics Conference and Exhibit 2012
Country/TerritoryUnited States
CityNew Orleans, LA
Period25/06/1228/06/12

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