detailed description
The Bremen University Hypersonic Tunnel (BHHK) is based on a design which has been developed by Ludwieg. He introduced the principle of an expansion tube in 1955. The high pressure storage is developed as a 24 m long charging tube and is interconnected to a vacuum tank through the fast acting valve, the hypersonic nozzle and the test section.
The following table contains the main technical data:
| Test section diameter | 250 mm |
| Length of whole facility | 11 m |
| Length of charge tube | 24 m |
| Charge tube diameter: | |
| 1. section | 38.14 mm |
| 2. section | 45.00 mm |
| Supply Equipment: | |
| Vacuum tank | 1.5 m3 |
| Vacuum pump | 160 m3/h |
| Gas storage | 0.1 m3 at 200 bar |
| Compressor | 6 kg/h at 250 bar |
| Power supply | 15 kW at 380 VAC |
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