Volumetric Measurement of a Shock Wave-Turbulent Boundary Layer Interaction Using Plenoptic Particle Image Velocimetry

Abstract

This paper explores the application of Plenoptic Particle Image Velocimetry (PIV) to study a Shock Wave-Turbulent Boundary Layer Interaction (SBLI) induced by an unswept fin. The fin is placed in a Mach 2 flow at an angle of attack of 15 •. The oblique shock wave introduced by the fin interacts with the turbulent boundary layer along the bottom wall. A plenoptic camera is a unique diagnostic tool that captures 3D information using a single camera. This novel imaging system can be combined with particle image velocimetry to obtain 3D velocity data about a flow field. For comparison, the volume analyzed in this study relates to a previous study in the same facility using two planar PIV experiments separated by approximately 12 mm. This is the first application of a plenoptic camera for volumetric studies of SBLI, and it has proven the unique capabilities of the plenoptic camera to obtain 3D velocity information in areas of limited optical access and in supersonic flows. Comparison with previous planar PIV shows the same interaction structure present in both results.

A Mini-Review of Recent Developments in Plenoptic Background-Oriented Schlieren Technology for Flow Dynamics Measurement

“…As one moves further from the fin, the height of the structure grows and its characteristics become straighter and more triangular in shape. These findings reveal the interacting shock foot and its spatial evolution, and are verified by plenoptic particle image velocimetry (PIV) [36,37].…”

Perspective on the development and application of light-field cameras in flow diagnostics

“…'Plenoptic-PIV' forms the core of LF flow diagnostics with successful applications in the studies of small marine animals [38] (figures 5(A) and 6(A)), compressor linear cascade [39] (figures 5(B) and 6(B)), birds and maneuvering wings [40], riverbed boundary-layer [41], shock-boundary layer interactions [42,43] (figures 5(C) and 6(C)), thin liquid film [44], rotating helicopter blade [45] (figures 5(D) and 6(D)), transcatheter heart valves [46] and numerous others. In figures 5 and 6's examples, constraints on optical access and depth of volume would have made a multi-camera system very challenging to implement.…”