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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 In future experiments the plasma dynamics could be investigated using ultrafast cameras with up to 2 Mio frames per seconds which are available to the corresponding authors. In the present work the maximum voltage and power limits of the new MPC thruster were not tested. The main task was the first demonstration of a pulsed MPC-based plasma thruster with ns-internal excitation for a stabile operation at high atmospheric pressures up to 1 bar. In this regard, a first breakthrough and pulse operation with 4.7 Hz was demonstrated. In the next step, the pulse frequency of the main discharge will be increased up to 10 Hz. Furthermore, a new mobile power generator will be developed for the first flight demonstration onboard of the b-Ionic Airfish, which was the world’s first airship propelled by plasma engines in 2005, see Figure 16a-16b. Only 0.08 N or 8 g would be sufficient to propel this 7.5 m airship at low speeds up to 1 m/s [32]. A 5 Hz thruster has already about 0.02 N. So an array of four plasma pulse “detonation” thrusters with the present power level would make it fly. The available maximum weight for the power generator is about 5.1 kg plus 1.2 kg for LiPo batteries [32]. The general thrust of an array with 10 cells, each operating with a pulse frequency of 50 Hz, is 2.0 N. The total power required for a first high altitude (H=20 km) demonstrator mission using an array with 10 thruster is about 75 kW. With a solar battery effectiveness of 0.2-0.3, the required minimum surface area is 250 m2. In any case, the new propulsion technology is still away from being competitive but it has to be noted that the research, development and optimization is now at the very beginning. The impulse bit for each thruster unit can be essentially increased by using different ejector schemes and jet focusing nozzle structures. These are items of next investigations. Furthermore, there are also a large amount of other possible technological applications in the field of aerodynamics, material sciences and power engineering. But a real flight demonstration is the next milestone goal towards new magneto-plasma flux compression thrusters for stratospheric airships or high altitude platform stations (HAPS) which are currently all limited to about 25 km altitude by using propellers. With future air-breathing magneto-plasma flux compression thrusters next generation solar, beamed or fusion energy powered airships could climb to altitudes up to 50 km and beyond. (a) (b) Figure 16a and 16b. The world’s first plasma propelled airship, the 7.5 m long b-Ionic Airfish (2005) [32]. Acknowledgements The breakthrough experiments were funded by Electrofluidsystems and performed by the authors in the company’s future workshop in Berlin. The numerical studies were performed by Tatiana Banokina in St. Petersburg funded by a grant of the St. Petersburg State University with number 11.37.167.2014. 9PDF Image | Breakthrough for Future Air-Breathing Magneto-Plasma Propulsion Systems 2017
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