Analysis of free turbulent steam jet by processing of IR-images

Jancskar, Ildiko and Ivanyi, Amalia (2007) Analysis of free turbulent steam jet by processing of IR-images. Pollack Periodica, 2 (2). pp. 13-26. ISSN 1788-1994

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Abstract

This paper presents an IR-imaging technique to visualize a turbulent steam flow. Instantaneous, time-averaged, Gaussian-smoothed and non-linear filtered IR-images are compared. Wavelet threshold is applied to separate the coherent part of the instantaneous intensity field from the incoherent part. The averaged image has been smoothed with a non-linear filter that preserves the energy content of the thermal image better than the Gaussian low-pass filtering. High frequency wavelet components of the processed IR-images highlight the differences of the applied filtering techniques. Reconstruction the flow pattern from these components shows the directional orientation of the instantaneous and averaged flows.

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