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Watanabe, D. and Maekawa, H. (2015) Transitional Structures and Sound Emission in a Supersonic Round Jet Forced by a Pair of Helical Modes. Proceedings of 9th International Symposium on Turbulence Shear Flow Phenomenon, Melbourne, 30 June-3 July 2015, Paper 49.

has been cited by the following article:

• TITLE: Three-Dimensional Visualization of Shock Cell Structure and Screech Tone Emission in Underexpanded Circular Jet

  AUTHORS: Keita Ozawa, Takayuki Yamagata, Nobuyuki Fujisawa

  KEYWORDS: Screech Tone, Aeroacoustics, Directivity, Frequency Spectrum, Underexpanded Circular Jet, Schlieren Imaging

  JOURNAL NAME: Journal of Flow Control, Measurement & Visualization, Vol.10 No.1, December 7, 2021

  ABSTRACT: The three-dimensional visualization of flow and screech-tone emission from an underexpanded circular jet is first investigated experimentally using high-speed cross-schlieren imaging and microphone measurements in the cross-sectional planes along the jet axis. This experimental technique allows the visualization of the shock-cell structure, directivity of sound intensity, and frequency spectrum in the cross-sectional planes of the screeching jet. The high-speed cross-schlieren observation of the screeching jet shows the occurrence of an asymmetrical shock-cell structure that is generated by the flapping mode in the screeching jet. This contributes to the generation of a screech tone propagating upstream along the jet axis and non-uniform sound intensities around the jet in circumferential direction. These observations by high-speed cross-schlieren imaging were validated by the microphone measurements.