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14th High-Tech Plasma Processes Conference (HTPP 14) IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Series 825 (2017) 012005 doi:10.1088/1742-6596/825/1/012005 The capacitor bank voltage Ub here was varied from 200 to 600 V, though the maximum possible value is 1200 V. The overall energy efficiency for other voltages can be estimated or calculated using the formula (1), the Wd, Ud values from Figure 14 and Cb = 2700μF. η=Wd /Wb = Id(t)·Ud(t)dt/[Cb ·Ub ·Ub /2] (1) Impulse bit measurements The impulse bit of the new MPC was investigated using a free pendulum with 55 mm length and a mass of 15 g (see Figure 12a-12b). The pendulum deflection angle varied from 5o to 25o. Such small angles allow the use of the simplest model for a mathematical pendulum. The method used for thrust measurement is comparatively simple but has several sources for systematic errors. The first is the kind of plasma jet-surface interaction (elastic, non-elastic). An absolutely inelastic interaction of the plasma jet with the pendulum surface was assumed. The second connects with the uncertainty of contact point for the jet-surface interaction because the direction of the generated plasma jet shows some fluctuations. And the third main reason for errors is the stochastic nature of the impulse arc discharge at high pressures of 0.2-1.0 bar. The estimated measurement accuracy is 10-15 %. Figure 12c shows a series of small motion pictures taken from a video for a variant with a more lightweight pendulum. Conductive and insulating pendula made the same impulse bit. Figure 13 shows the measured impulse bit for different battery voltages and different atmospheric pressures. The first results show a comparatively weak dependence between impulse bit and atmospheric pressure in the measured range from 175-1000 mbar. (a) 0 V, 1000 mbar (b) 400 V, 1000 mbar (c) 400 V, 1000 mbar Figure 12a-12c. Measurement of impulse bit (Ibit) and thrust demonstration using a pendulum. 5 4 3 2 1 0 200V 400V 300V 0 200 400 600 P mbar 800 1000 Figure 13. Measured impulse bit for different battery voltages and different atmospheric pressures. 7 Ibit mNsPDF Image | Breakthrough for Future Air-Breathing Magneto-Plasma Propulsion Systems 2017
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