Vol.:(0123456789) 1 3 Experiments in Fluids (2021) 62:39 https://doi.org/10.1007/s00348-021-03142-6 RESEARCH ARTICLE Stereoscopic particle image velocimetry of laser energy deposition on a mach 3.4 fow feld Arastou Pournadali Khamseh 1  · Ramez M. Kiriakos 1  · Edward P. DeMauro 1 Received: 6 October 2020 / Revised: 5 January 2021 / Accepted: 9 January 2021 © The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature 2021 Abstract Experiments were performed within Rutgers University’s supersonic wind tunnel to measure the infuence of of-axis laser energy deposition on the fow feld about an ogive cylinder at a freestream Mach number of 3.4. Perturbation of the fow feld was accomplished using an infrared laser source, focused to a point ahead of the ogive cylinder. Stereoscopic particle image velocimetry measurements were performed to quantify the efects of energy deposition on the fow feld at discrete time delays following the generation of the spark. The SPIV results showed a measurable change in streamwise velocity downstream of ogive’s shock that appears to be dependent on proximity of the initial spark to the ogive’s surface. In contrast, the spark was shown to have little infuence on the vertical velocity component at early times. Data corresponding to later times showed the passage of an induced jet through the fow feld. The jet rotated about its axis while passing through the shock structure, in agreement with previous qualitative imaging. These results demonstrate the feasibility of using SPIV to investigate the infuence of laser energy deposition on the fow feld. Graphic abstract 1 Introduction Trajectory control at high speeds is a challenging endeavor due to the need for appreciable control authority (Knight 2013). As Mach number increases, mechanical devices become less efective due to their inherent inertia (Knight 2013; Russell et al. 2016). Plasma-based methods of fow control ofer a solution to this dilemma by rapidly increas- ing the local fuid temperature through energy deposition * Edward P. DeMauro edward.demauro@rutgers.edu 1 Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, 98 Brett Road, Piscataway, NJ 08854, USA