Correlations and wavelet based analysis of near-field and far-field pressure of a controlled high speed jet

Kerwin R. Low, Zachary P. Berger, Jacques Lewalle, Basman El-Hadidi, Mark N. Glauser

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

11 Scopus citations

Abstract

Discussed within are the experimental results obtained via simultaneous near-field and far-field measurements of a controlled jet. A large database of both open-loop and closed-loop control cases are carried out. The two most interesting investigations from the open-loop (OL) and closed-loop (CL) studies are highlighted here and compared to the uncontrolled jet. For the open-loop forcing, the shear layer is seeded with an axisymmetric sinusoidal input with a frequency of 1700 Hz. For the closed-loop case, the shear layer is seeded with a sinusoidal forcing amplitude modulated with the mode-filtered near-field pressure sampled from the stream-wise location at x/D = 6. Data analysis looks at both averaged and instantaneous quantities. In an averaged sense the introduction of control significantly modifies the characteristics of the developing shear layer. Open-loop control is shown to modify the phase lag between both near-field stations with a penalty in an increase in the overall sound pressure level. The closed-loop control imparts more subtle changes to the flow field but yields a slight reduction in the acoustic pressure at the microphone closest to the jet axis. Wavelet based filtering exposes the evolution of the broadband intermittent events seen at both stations.

Original languageEnglish (US)
Title of host publication41st AIAA Fluid Dynamics Conference and Exhibit
StatePublished - Dec 1 2011
Event41st AIAA Fluid Dynamics Conference and Exhibit 2011 - Honolulu, HI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

Name41st AIAA Fluid Dynamics Conference and Exhibit

Other

Other41st AIAA Fluid Dynamics Conference and Exhibit 2011
CountryUnited States
CityHonolulu, HI
Period6/27/116/30/11

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Correlations and wavelet based analysis of near-field and far-field pressure of a controlled high speed jet'. Together they form a unique fingerprint.

  • Cite this

    Low, K. R., Berger, Z. P., Lewalle, J., El-Hadidi, B., & Glauser, M. N. (2011). Correlations and wavelet based analysis of near-field and far-field pressure of a controlled high speed jet. In 41st AIAA Fluid Dynamics Conference and Exhibit (41st AIAA Fluid Dynamics Conference and Exhibit).