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Related Experiment Video

Updated: Apr 16, 2026

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Note: Background Oriented Schlieren as a diagnostics for airflow control by plasma actuators.

I Biganzoli1, C Capone1, R Barni1

  • 1Dipartimento di Fisica G.Occhialini, Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, Milano I-20126, Italy.

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Summary

Background Oriented Schlieren (BOS) visualizes plasma actuator flow control. This study adapts BOS to analyze dielectric barrier discharges, revealing ionic wind characteristics without external airflow.

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Area of Science:

  • Fluid Dynamics
  • Plasma Physics
  • Optical Measurement Techniques

Background:

  • Background Oriented Schlieren (BOS) is an optical method measuring refractive index gradients.
  • BOS offers versatility, capturing 2D gradients unlike traditional Schlieren methods.
  • Plasma actuators are explored for flow control applications.

Purpose of the Study:

  • To adapt and characterize BOS for studying plasma actuators.
  • To investigate the flow characteristics of surface dielectric barrier discharges.
  • To analyze the ionic wind generated by plasma actuators.

Main Methods:

  • Implementation of a novel Background Oriented Schlieren (BOS) system.
  • Utilizing BOS to visualize flow fields generated by plasma actuators.
  • Experimental analysis of ionic wind in the absence of external airflow.

Main Results:

  • Demonstrated the capability of BOS to visualize plasma-induced flows.
  • Quantified characteristics of the ionic wind generated by dielectric barrier discharges.
  • Provided insights into the performance of plasma actuators.

Conclusions:

  • BOS is a suitable technique for analyzing plasma actuator performance.
  • The study provides foundational data on ionic wind generation.
  • This work advances the understanding of plasma-based flow control.