Mach-number dependence of acoustic source properties in high speed jets Part II: Event-based description

Pinqing Kan, Jacques Lewalle, Sivaram P. Gogineni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

For jet noise at three Mach numbers, we isolate and document properties of acoustic events. Pattern recognition in the time-frequency domain isolates events common to farfield acoustic data and near-field signals obtained from time-resolved PIV. From the signals treated in Part I, we identify the excerpts that contribute most to the cross-correlations. The time-frequency decomposition is achieved with continuous wavelet transforms. We identify far-field events (MM) responsible for the cross-correlation between microphones, and DM events that account for the cross-correlation between the kinematic diagnostics and one microphone. MM and DM events are intermittent in time and frequency. The lists of MM and DM events, including time of occurrence, frequency and magnitude, are compared for nine sets of data featuring three different Mach numbers and different window locations. We match the events individually (near-and far-field excerpts) and document some of their collective properties.

Original languageEnglish (US)
Title of host publication52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102561
StatePublished - 2014
Event52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 - National Harbor, MD, United States
Duration: Jan 13 2014Jan 17 2014

Other

Other52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
CountryUnited States
CityNational Harbor, MD
Period1/13/141/17/14

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Fingerprint Dive into the research topics of 'Mach-number dependence of acoustic source properties in high speed jets Part II: Event-based description'. Together they form a unique fingerprint.

  • Cite this

    Kan, P., Lewalle, J., & Gogineni, S. P. (2014). Mach-number dependence of acoustic source properties in high speed jets Part II: Event-based description. In 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 American Institute of Aeronautics and Astronautics Inc..