Thermally stratifying a wind tunnel for buoyancy influenced flows |
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| Authors: | J. H. Lienhard V C. W. Van Atta |
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| Affiliation: | (1) Department of Mechanical Engineering, Massachusetts Institute of Technology, 02139 Cambridge, MA, USA;(2) Department of Applied Mechanics and Engineering Sciences, University of California at San Diego, 92093 La Jolla, CA, USA |
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| Abstract: | A novel method of heating wind tunnel flows to strong thermal stratifications is described. Variable electric heating is employed to create user-selectable temperature profiles in steady, uniform mean flow. Linear temperature gradients of up to 200 °C/m (Väisälä frequencies of 2.5 rad s-1) can be sustained. The performance of the facility is discussed in the context of continuously-stratified grid-generated turbulence, although it is useful for a broader set of applications. The flow field is found to be free of deleterious natural convection and internal wave effects. The departure from homogeneity of grid-generated, stratified turbulence in the facility is roughly ±10% away from the wall influenced regions. |
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