(Color online) Schematic illustration of the setup for the simultaneous photographing of plasma jet and gas flow. The light emitted from the plasma plume arrives at the camera (L and I) via reflection by a half-reflective/half-transmissive mirror M1, with the plume on the imaged focus plane of the camera with regard to M1. For the schlieren photograph of gas flow, light from a source (S), first going through M1 and then being reflected by the spherical mirror M2 to illuminate the gas flow, is deflected by M1 to the camera, to which a knife-edge (K) is put at the imaged focal point of M2, in front of the lens (L) of the camera.
(Color online) Simultaneously shot photographs of plasma plumes obtained with single active electrode and schlieren photographs of gas flows with and without discharge being on. Numbers on the left denote the gas flow rate in SLM. Applied voltage: 8 kV.
(Color online) Simultaneously shot photographs of plasma plumes and schlieren photographs of gas flows at a fixed flow rate of 0.8 SLM obtained for different discharge modes: (a) DBD mode; (b) “overflow jet” mode; and (c) single active electrode mode. Numbers on the photographs denote the applied voltages in kV. Exposure time: 10 s.
(Color online) Schlieren photographs of gas flows referred exactly to the situations presented in Fig. 3, but taken with an exposure time of only 1/15 s. Numbers on the photographs denote the applied voltages in kV. Plasma jets are invisible because of the weak intensity.
Discharge currents measured between the electrodes for the DBD mode operated under different voltages. Gas flow rate: 0.8 SLM.
(Color online) Schlieren photographs of free gas flow at five different flow rates (green). For the case of 0.2 SLM, the photograph taken when the plasma was on (blue, indicated with ‘0.2 with discharge’) is also provided for comparison. Applied voltage: 8 kV.
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