A new method of acquiring a permanent full-scale oil flow pattern in hypersonic pulse tunnel

This paper presents a new method of acquiring a permanent full-scale oil flow pattern using a sheet of wax paper and its application to the study of swept shock and boundary layer interaction in the hypersonic pulse tunnel. It is gratifying to notice that the technique is easy to apply to a model and offers a clear authentic full-scale visible flow pattern that is investigated by visual inspection without photographic processing. The present study indicates that the oil dot wax paper visualization is trustworthy and particularly suited to short duration facility.