Abstract
The stagnation state of the flow induced by unsteady expansion waves is dependent on the strength of the expansion waves. Therefore, even if the initial condition in the supply tube of a Ludwieg tube is the same, the stagnation state of the flow in the test section varies with the Mach number of the flow in the supply tube. In the present paper, the starting process of a transonic Ludwieg tube with a quick-opening valve upstream of the test section was experimentally investigated over a range of the throat area of the nozzle, which is uniquely related to the Mach number of the flow in he supply tube. Based on the results of the pressure measurements, wave diagrams showing the starting process were presented, and the effects of the Mach number of the flow in the supply tube on the starting process were clarified by the consideration of the flow rate in the plenum chamber.
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