This paper has proposed a high temperature superconducting (HTS) field-modulation double-stator (HTS-FMDS) machine with a stationary seal for low-speed and direct-drive applications. The originality of this paper lies in the HTS field-excitation windings, which were fed with a direct current in order to offer strong field excitation, were placed in the inner stator, while the armature windings were installed in the outer stator so that the stationary seal of the cryogenic cooling system could be achieved. Moreover, a ferromagnetic ring was mounted on the top of each HTS coil to prevent the quench of the HTS wires resulting from the armature-reaction magnetic-field. By using finite-element analysis (FEA), the influence of the armature-reaction magnetic-field on the critical current and the electromagnetic properties were carried out so as to verify the validity of the proposed machine.
The building-integrated wind turbine is a new technology for the utilization of wind energy in cities. Previous studies mainly focused on the wind turbines mounted on the roofs of buildings. This paper discusses the performance of Savonius wind turbines which are mounted on the edges of a high-rise building. A transient CFD method is used to investigate the performance of the turbine and the interaction flows between the turbine and the building. The influence of three main parameters, including the turbine gap, wind angle, and adjacent turbines, are considered. The variations of the turbine torque and power under different operating conditions are evaluated and explained in depth. It is found that the edge-mounted Savonius turbine has a higher coefficient of power than that operating in uniform flows; the average Cp of the turbine under 360-degree wind angles is 92.5% higher than the turbine operating in uniform flows. It is also found that the flow around the building has a great impact on turbine performance, especially when the turbine is located downwind of the building.
Because of its benefits of high deposition rate and significant economic benefits, particularly for the effective and quick prototyping of big and complicated parts, wire arc additive manufacturing technology has garnered considerable interest from industry and academics. In this paper, the evolution of WAAM technology is reviewed, the macro and micro mechanical attributes of wire arc additive parts are introduced, the techniques used by researchers to reduce anisotropy and enhance mechanical characteristics are presented, and the typical processes of WAAM parts are summarized. Finally, it is projected that WAAM technology would advance. Finally, the development prospect of WAAM technology is anticipated. The findings indicate that there are still many difficulties in the widespread application of WAAM technology, and the key work in the next time will be to improve the automatic nature of additive manufacturing specimens while also maximizing the technological parameters of additive manufacturing.
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