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Shock Wave Observation in Narrow Tubes for a Parametric Study on micro Wave Rotor Design

Journal of Thermal Science 2008年第2期17卷 134-140页

作者： Koji Okamoto Mikiya Araki Department of Aeronautics and Astronautics University of Tokyo Department of Mechanical Engineering Gunma University

Wave rotor is expected to improve the performance of micro gas turbines drastically. In the wave rotor design, the rotor speed is determined principally by the tube length. Therefore, a longer tube is preferable for miniaturized wave rotors to avoid the difficulty in bearings and lubrication system, while it may yield thicker wall boundary layer, shock wave dissipation and so on. In the present study, an experimental apparatus was built to visualize the wave rotor internal flow dynamics in a narrow tube by schlieren method and Laser Doppler Anemometry. In addi- tion, different lengths of the tube were adopted and compared to investigate the effect of wall friction. Finally, 2D numerical simulation was performed and the results were compared with those of experiments.

关键词： wave rotor shock wave unsteady flow micro propulsion flow visualization.

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Cathode position effects on microwave discharge cusped field thruster

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Plasma Science and Technology 2023年第4期25卷 120-127页

作者：曾明刘辉陈野于达仁黄洪雁 Lab of Plasma propulsion Harbin Institute of TechnologyHarbin 150006People’s Republic of China

The microwave discharge cusped field thruster is a novel concept of electric micropropulsion device,which operatesμN level thrust in low mass flow rate conditions,making use of a coaxial transmission line *** its advantages of low thrust noise and high thrust resolution over a wide range of thrust,the thruster has emerged as a candidate thruster for the space-borne gravitational wave detection *** cathode effects commonly exist in many kinds of electric propulsion,and they are typically significant in *** order to find out the cathode position effects on a microwave discharge cusped field thruster,a thermionic cathode is mounted on a cross-slider for *** different cathode positions,the plume is analyzed by a Faraday probe and a retarding potential analyzer to analyze the performance and discharge *** results show that the magnetic mirror effect leads to significant degradation of anode current and an increase in low-energy ion ratio as the cathode moves away from the thruster *** electron conduction route also significantly impacts anode current efficiency,related to the cathode-exit distance and the thruster magnetic topology.

关键词： cusped field thruster cathode coupling microwave plasma micro propulsion thermionic cathode

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