Abstract
The blockage tolerance characteristics are described of an atmospheric boundary layer wind tunnel for building aerodynamics which incorporates an automatic, passive method of minimising the effects of blockage. The method of providing blockage tolerance had been previously developed and proved for one- and two-dimensional bluff bodies in smooth uniform flow wind tunnels. This is the first time that the methodology has been incorporated in a wind tunnel intended for testing three-dimensional building models in scaled atmospheric boundary layer flows. In order to build on the previous experience of the method, the tests reported here were conducted on three-dimensional models in uniform flow. The blockage tolerance is compared with conventional closed-wall and open-jet configurations. It is demonstrated that the blockage tolerance method allows the use of larger models giving an apparent blockage ratio over four times greater than in a conventional closed wind tunnel of the same size, although the method does not work exactly as predicted from the earlier one- and two-dimensional tests.
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