2006 Volume 54 Issue 625 Pages 48-54
An interferometric CT technique has been applied to observe a 3-D unsteady and shock/vortex interacting flow field induced by shock waves. A small duct model with a pair of circular open ends is introduced in the test section of diaphragmless shock tube, which can be rotated around its central axis to change the observation angle. The estimated shock Mach number is about 2.3 at the exits of the model in nitrogen gas. Computational fluid dynamics (CFD) simulation by TVD scheme is also applied to the unsteady 3-D inviscid flow field. We developed a novel presentation method of flow field, which is named as ‘Distribution Combined Schlieren Images (DCSI) method’ to the CT results to demonstrate the 3-D features of complex flow field in our study. The results of CT measurement and CFD simulation are discussed.
