Description and Flow Assessment of the Delft Hypersonic Ludwieg Tube

摘要

An assessment of the hypersonic Ludwieg tube of Delft University of Technology is given. The facility is describedntheoretically, and an experimental evaluation is performed to infer the facility performance. Experiments arenperformed using conventional techniques such as static and total head pressuremeasurements and Fay–Riddell heatnflux evaluations by means of infrared thermography. Furthermore, particle image velocimetry is used to deducennozzle boundary-layer parameters aswell as the freestreamvelocity field and the static and total temperatures for thenMach 7 nozzle. For the Mach 9 nozzle, stagnation heat flux measurements are performed to obtain the totalntemperature of the flow. The freestreamvalueswere determined experimentally in two differentways and the resultsnshowed good agreement. The application of particle image velocimetry allows the freestream flowfield to be directlynobtained and gives a directmeasure for the flowfield uniformity (0.2%) and repeatability (0.4%). The static and totalntemperatures calculated from the particle image velocimetry results showed that there is a large mismatch betweennthe theoretical total temperature and measured total temperature, which is attributed to heat losses present in thenthroat and nozzle.