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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v12.i3.10
pages 197-214

FLOW VISUALIZATION STUDIES OF JETS IN THE PRESENCE OF LOUD PURE TONES

K. Ramamurthi
Thermodynamics and Combustion Laboratory, Indian Institute of Technology, Madras, Chennai 600036, India
R. Patnaik
Propulsion Research and Studies Group, Liquid Propulsion Systems Centre, Trivandrum, India
A. Radhakrishnan
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India
P. Reddy
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India
R. I. Sujith
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India
R. N. Govardhan
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India

ABSTRAKT

Loud pure hole tones between 2300 and 10,000 Hz were induced in a jet by establishing turbulent flow of gaseous nitrogen through a rectangular chamber with a sharp-edged orifice at the exit. Visual observations of the jet and velocity measurements indicated a very drastic spread of the jet near the orifice exit in the presence of the loud pure tones. The potential core appeared to be no longer present and the flow-field became asymmetric. The enhanced spread of the jet and the asymmetry were not observed when the flow field had a broad-band frequency spectrum. Wavelet analysis of the instantaneous planar Mie scattering flow images was performed with a view to qualitatively study and compare the entrainment and mingling in two jets with and without acoustic self-excitation.