A bstract
Two-dimensional velocity distributions outside a Mach 2.0 supersonic nozzle have been investigated using a digital particle im age velocimetry (PIV). Mean velocities , vor ticity field and volume dilatation field were obtained from PIV images using 0 .33 μm titanium dioxide (TiO2) particle. The seeding particle of larger size , 1.4 μrn Ti02, was also used for the experimental comparison of velocity lag downstream of shock waves. The results have been compared and analyzed with schlieren photographs for the locations of shock waves and over-expanded shock structure to inspect possibilities and limits of a PIV technique to over-expanded supersonic flows. It is found that although the quantitative velocity measurement using PIV on over-expanded supersonic flows with large velocity and pressure gradients is limited, the locations of normal shock and oblique shock waves can be resolved by the axial/radial velocity fields, and over-expanded shock structure can be predicted by vorticity field and volume dilatation field which are acquired from the spatial differential of the velocity field.
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Kyubok Ahn: He is a Ph.D. candidate at School of Mechanical and Aerospace Engineering in Seoul National University. He received his MS degree at School of Mechanical and Aerospace Engineering in 2001 from the same University. His research interests are laser diagnostics , such as PIV and PLIF, aerodynamics in a ramjet combustor and transverse liquid injection in subsonic crossflows .
Ji-Ho Kim: He received his Ph.D. degree and MS degree at school of Mechanical & Aerospace Engineering in Seoul National University in 2003 and 1998, respectively . Currentl y, he is a senior research engineer of Hyundai Motor Company . His research interests are laser diagnostics , such as simultaneous PIV and PLIF, bluff-body stabilized supersonic flame, and numerical simulation for model scramjet engine .
Youngbin Yoon: He received his MS degree at School of Mechanical and Aerospace Engineering in 1987 from Seoul National University and his Ph . D. degreeat Depar tment of Aerospace Engineering in 1994 from University of Michigan. After obtaining Ph.D. he worked as a researcher in University of California , Davis .And then he join ed Seoul National University and currently is an associate professor. His research interests are visualization, laser diagnostics , supersonic combustion , turbulent diffusion flames and liquid rocket injectors .
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Ahn, K., Kim, J.H. & Yoon, Y. Application of PIV to over-expanded supersonic flows: Possibilities and limits. J Vis 6, 353–361 (2003). https://doi.org/10.1007/BF03181742
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DOI: https://doi.org/10.1007/BF03181742