Development of Background-Oriented Schlieren technique
MACE PhD student completes testing at Mach 7.0 and 5.3 at the German aerospace centre, DLR, as part of his PhD research study.
Tom Fisher has recently completed testing at Mach 7.0 and 5.3 at the German aerospace centre, DLR as part of his PhD research study. The purpose of the visit was to apply the Background-Oriented Schlieren (BOS) technique that he is developing on the hypersonic tunnel (HSST) within MACE to the standard European Space Agency (ESA) aerothermodynamics test cases performed at DLR. The BOS technique is a development of the standard optical schlieren technique in existence for over 150 years. The optical equipment was installed inside the test section of the hypersonic wind tunnel (H2K) which features a nozzle four times the diameter of the HSST and is the largest facility of its kind in Europe.
The two-week visit demonstrated that the technique under development at Manchester could be applied to a larger and more complex facility than the HSST. Several technical challenges needed to be solved on-site which ultimately led to the acquisition of data for the entire set of planned test cases. This demonstrated the range of applicability of the technique in supporting non-intrusive flow diagnostics of hypersonic flows.