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Test and Improvement of Flow Distribution in a Sudden Changed Structure

In this paper, we describe the work on measuring flow distribution down-stream of a 90 elbow, and on improving the flow to satisfy installation of a flow meter. In the sudden changed flow channel, flow velocity distribution is very irregular. Both asymmetry and swirl exist, which cause severe error in flow rate measurement. To improve the flow, a honeycomb with distributed blocks was used. The result showed that this design is able to largely improve the flow distribution. Keywords-internal flow; velocity measurement; straightener design