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The flow in a low-powered arc gas heater combined with a supersonic nozzle of throat diameter less than 1 mm is quite complicated and difficult to describe in quantitative detail. Experiments on arc-heated supersonic jet thrusters of monatomic gases argon and helium have been carried out and their performance measured. The flow characteristics are analyzed with the help of numerical simulation. Results...
The aerodynamic aspects of indirect thrust measurement by the impulse method have been studied both experimentally and numerically. The underlying basic aerodynamic principle is outlined, the phenomena in subsonic, supersonic and arc-heated jets are explored, and factors affecting the accuracy of the method are studied and discussed. Results show that the impulse method is reliable for indirect thrust...
A real-time and non-contact method using scanning electron microscopy is demonstrated for the electromechanical analysis of suspended single-walled carbon nanotubes (su-SWCNTs) to estimate the adhesive force to the supporting templates. The su-SWCNTs were directly synthesized across vertically-aligned carbon nanofibers (CNFs) with size-reduced catalytic nanoparticles encapsulated at the tips using...
Summary form only given. A novel method of measuring the position of arc spots in a tubular arc heater by embedding a large number of optical fibers along the axial direction in the wall of the electrodes has been developed. The light intensity signals from inside the arc heater are transmitted through these fibers and measured by an optical spectrum analyzer. The distribution of light intensity along...
Summary form only given. A magnetic field is often used to rotate an electric arc in thermal plasma generators. Experimental results have shown that such a magnetic field also affects the axial motion of the arc spots. A new formula for the axial magnetic field force on an electric arc is derived from the knowledge about the interaction of charged particles and magnetic field. It is shown that the...
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