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Laser velocimetry of a plane mixing layer with a specific initial condition for study of turbulence characteristics of enhanced growth rate

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Abstract

Mixing layers are sensitive to the mixing angle and turbulence in the primary streams. Although there is extensive available research on this rather basic flow, there are still no suggestions for a clearly best configuration. For example, the combination of a laminar initial boundary layer and a large mixing angle has received little attention. In this work we test a new experimental configuration with large mixing angle and laminar/turbulent initial boundary layer that was not examined experimentally by LDA and PIV. This setup is expected to be a representation of the initial conditions that must result in better mixing. A plane mixing layer with a velocity ratio of 0.6 is produced by rebuilding an open circuit wind tunnel. Extensive calibration tests on velocity profiles and Reynolds stresses established the position of the self similar region. Velocity field measurements with laser Doppler anemometer (LDA) and particle image velocimeter (PIV) showed enhanced mixing layer growth. PIV plots showed the presence of stream-wise and cross stream vortices in the self-similar region without any considerable change in turbulence characteristics to that of reported in the literature. The article presents a combination of different experimental results that give a deeper understanding of this very configuration.

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Authors and Affiliations

  1. Mechanical Engineering Department, Amirkabir University of Technology, 424 Hafez Ave, Tehran, Iran

    Mojtaba Mehrjooei, Nader Montazerin & Abraham Damangir

Authors
  1. Mojtaba Mehrjooei
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  2. Nader Montazerin
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  3. Abraham Damangir
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Corresponding author

Correspondence to Nader Montazerin.

Additional information

Recommended by Associate Editor Simon Song

MojtabaMehrjooei received his Bachelor’s degree from the University of Tabriz and MSc degree from Amirkabir University of Technology. His research interests include experimental fluid mechanics and development of gas refineries. He works with gas refinery companies.

Nader Montazerin is professor of Mechanical Engineering at Amirkabir University of Technology. He received his Bachelor’s degree fromSharif University of Technology, Tehran, Iran. This was followed by MSc and Ph.D degrees in Mechanical Engineering from Cranfield University, Bedford, England. His research interests include turbomachines, experimental fluid mechanics, natural gas distribution systems and applied energy systems. He has done various consultancy works with natural gas and power industries.

Abraham Damangir is Emeritus assistant professor in Mechanical Engineering at Amirkabir University of Technology. He received his BSc. and Ph.D from the same university but earned his MSc from the Imperial College of Science and Technology, England.

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Mehrjooei, M., Montazerin, N. & Damangir, A. Laser velocimetry of a plane mixing layer with a specific initial condition for study of turbulence characteristics of enhanced growth rate. J Mech Sci Technol 26, 1049–1057 (2012). https://doi.org/10.1007/s12206-012-0222-0

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  • DOI: https://doi.org/10.1007/s12206-012-0222-0

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