Investigation of Transonic Ludwieg Tubes Part I Starting Process in the Case of an Upstream Valve

概要

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Among many different types of transonic wind tunnels, a transonic Ludwieg tube is the most suitable facility for very high Reynolds number transonic wind tunnel testing. At present, however, the transonic starting process and starting time of this short duration test facility are not well clarified. In the present paper, the starting process of transonic Ludwieg tube with a quick-opening valve upstream of the transonic test section was experimentally investigated over a range of plenum chamber volumes and flow rates using a plenum exhaust system. As the result, it has been shown that a steady and uniform flow in the test section is established when the mass flow rate through the porous wall of the test section becomes equal to that through the plenum exhaust system. Based on the experimental results, wave diagrams showing the starting process were presented, and the flow mechanism of the starting process was clarified.
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