The spectral characteristics of radio frequency (RF) discharge plasma were studied at a static air pressure of 12 kPa (pressure corresponding to supersonic wind tunnel section). The effect of RF discharge plasma actuation on unsteadiness of shock wave/boundary layer interaction was studied in supersonic air flow with Ma of 2. The experimental results show that, the relative spectral intensity representing electron temperature rises with the increase of loading power at the same actuation frequency, while the relative spectral intensity representing vibration temperature and electron density hardly changes. When the loading power remains unchanged, as the actuation frequency increases, the relative spectral intensity representing electron temperature increases first and then decreases, however, the relative spectral intensity representing vibration temperature and electron density doesn’t change significantly. The dominant frequency of shock wave oscillation is low frequency without plasma actuation. After applying radio frequency discharge plasma actuation, the low-frequency oscillation of shock wave is weakened and the high-frequency oscillation is strengthened; the characteristic frequency of shock wave changes from low frequency to high frequency; high-energy vortex appears in the boundary layer.
Bang-huang CAI,Hui-min SONG,Shan-guang GUO,Hai-deng ZHANG,Jia-ming SHENG. Control effect of radio frequency discharge plasma excitation on shock wave/boundary layer interference. Journal of ZheJiang University (Engineering Science), 2020, 54(9): 1839-1848.
Fig.1Emission spectrum diagnosis system of radio frequency discharge
Fig.2Experimental system of shock wave/boundary layer interference (SWBLI) nonconstancy control
Fig.3Compress corner experimental apparatus
Fig.4Images and emission spectra of radio frequency surface discharge at 12 kPa pressure
Fig.5Emission spectrum and relative spectral intensity variation under different load powers
Fig.6Emission spectrum and relative spectral intensity variation at different frequency levels
Fig.7Schlieren diagram of reference flow field.
Fig.8Power spectral density of grayscale time series at monitoring points Q1~Q4
Fig.9Correlation between monitoring points K1−K6 and other locations of flow field
Fig.10Spatial spectrum distribution of specified frequency in reference flow field
Fig.11Schlieren figure with excitation frequency of 0.7 MHz and spatial distribution of power spectrum at different specified frequencies
Fig.12Schlieren figure with excitation frequency of 1.0 MHz and spatial distribution of power spectrum at different specified frequencies
Fig.13Radio frequency discharge schlieren at different moments
Fig.14Schematic diagram of shock wave location extraction
Fig.15Spectrum diagram of shock position time series
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