Abstract
The influence of a porous ring insert on the structure of a swirling flow in a channel is investigated. In a strongly swirling flow the main part of the flow from the porous layer is expelled into the near-wall region and only a small part is expelled into the axial region. The maximum of the tangential velocity in the axial zone decreases with growth of the porosity. In the near-wall region the influence of the porosity on the distribution of the tangential velocity is insubstantial. With increase of the porosity the process of expulsion of gas from the porous layer becomes less intense; a zone of return flows arises at smaller swirl angles; the size of this zone increases with growth of the porosity.
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