Enhancing the test time performance of Ludwieg tunnels
Ground testing at hypersonic conditions requires either expensive heating or reduced test time. This paper discusses further developments to a mode of operation for Ludwieg Tunnels - Plenum Augmented Ludwieg Mode (PALM) - in the Oxford High Density Tunnel (HDT). PALM offers increased test time perfo...
| Hlavní autoři: | , , , |
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| Médium: | Conference item |
| Jazyk: | English |
| Vydáno: |
Aerospace Research Central
2024
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| Shrnutí: | Ground testing at hypersonic conditions requires either expensive heating or reduced test
time. This paper discusses further developments to a mode of operation for Ludwieg Tunnels -
Plenum Augmented Ludwieg Mode (PALM) - in the Oxford High Density Tunnel (HDT). PALM
offers increased test time performance relative to standard Ludwieg Mode at the expense of total
pressure and unit Reynolds number capability. A description of the theory of operation and
the implementation of PALM in the HDT is given. Experimental results, quasi-1D numerical
simulations and a performance map are presented. PALM has been demonstrated to offer a
factor of 10 increase in the test time with a reduction in maximum Unit Reynolds number of
approximately 50% relative to standard Ludwieg Mode. Theoretical performance maps predict
that PALM can offer a factor of 10 improvement in test time for all Mach 7 unit Reynolds
numbers run to date in HDT without any facility upgrades. Hence, operation in PALM
significantly improves the capability of the HDT to investigate unsteady and long duration flow
phenomena relative to standard Ludwieg Mode operation. |
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