Mach 5 bow shock control by a nanosecond pulse surface dielectric barrier discharge

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physics of Fluids (1994)

DOI:https://doi.org/10.1063/1.3599697· OSTI ID:22038552

Nishihara, M; Takashima, K; Rich, J W; Adamovich, I V ^[1]

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1. Michael A. Chaszeyka Nonequilibrium Thermodynamics Laboratories, Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, Ohio 43210 (United States)

Bow shock perturbations in a Mach 5 air flow, produced by low-temperature, nanosecond pulse, and surface dielectric barrier discharge (DBD), are detected by phase-locked schlieren imaging. A diffuse nanosecond pulse discharge is generated in a DBD plasma actuator on a surface of a cylinder model placed in air flow in a small scale blow-down supersonic wind tunnel. Discharge energy coupled to the actuator is 7.3-7.8 mJ/pulse. Plasma temperature inferred from nitrogen emission spectra is a few tens of degrees higher than flow stagnation temperature, T = 340 {+-} 30 K. Phase-locked Schlieren images are used to detect compression waves generated by individual nanosecond discharge pulses near the actuator surface. The compression wave propagates upstream toward the baseline bow shock standing in front of the cylinder model. Interaction of the compression wave and the bow shock causes its displacement in the upstream direction, increasing shock stand-off distance by up to 25%. The compression wave speed behind the bow shock and the perturbed bow shock velocity are inferred from the Schlieren images. The effect of compression waves generated by nanosecond discharge pulses on shock stand-off distance is demonstrated in a single-pulse regime (at pulse repetition rates of a few hundred Hz) and in a quasi-continuous mode (using a two-pulse sequence at a pulse repetition rate of 100 kHz). The results demonstrate feasibility of hypersonic flow control by low-temperature, repetitive nanosecond pulse discharges.

• OSTI ID: 22038552
• Journal Information: Physics of Fluids (1994), Vol. 23, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-6631
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACTUATORS
AIR FLOW
COMPRESSION
DIELECTRIC MATERIALS
ELECTRON TEMPERATURE
EMISSION SPECTRA
HYPERSONIC FLOW
IMAGES
INTERACTIONS
ION TEMPERATURE
MACH NUMBER
PERTURBATION THEORY
PLASMA
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PULSES
SHOCK WAVES
STAGNATION
SURFACES
WIND TUNNELS