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Magnetohydrodynamic(MHD) power generation with supersonic non-equilibrium plasma is demonstrated. Capacitively coupled radio frequency(RF) discharge(6 MHz, maximum continual power output of 200 W) was adopted to ionize the Mach number 3.5(650 m/s),0.023 kg/m3 airflow. In a MHD channel of 16 mm*10mm*20 mm, MHD open voltage of 10 V is realized in the magnetic field of 1.25 T, and power of 0.12 m W is extracted steadily and continuously in the magnetic field of 1 T. The reasons for limited power generation are proposed as:low conductivity of RF discharge; large touch resistance between MHD electrode and plasma;strong current eddies due to flow boundary layer. In addition, the cathode voltage fall is too low to have obvious effects on MHD power generation.
Capacitively coupled radio frequency (RF) discharge (6 MHz, maximum continual power output of 200 W) was adopted to ionize the Mach number 3.5 (650 m / s), 0.023 kg / m3 airflow. An MHD channel of 16 mm * 10 mm * 20 mm, MHD open voltage of 10 V is realized in the magnetic field of 1.25 T, and power of 0.12 m W is extracted steadily and continuously in the magnetic field of 1 T. The reasons for limited power generation are proposed as: low conductivity of RF discharge; large touch resistance between MHD electrode and plasma; strong current eddies due to flow boundary layer. obvious effects on MHD power generation.