A method for electromagneto-thermo- mechanical direct coupling analysis and its application to Tokamak structures

Abstract

In this work, a numerical method using a direct coupling algorithm is proposed for electromagneto-thermo-mechanical (EMTM) coupling analysis of structures in strong magnetic and thermal field. Both the electromagneto-mechanical (EMM) coupling effect and thermal effect are considered in the structural dynamical analysis. To realize this algorithm, a direct coupling element including degrees of freedom of displacement, temperature and electromagnetic fields is developed on the platform of the ANSYS user programmable features and verified by the comparison between the experimental data and simulation results of a typical EMTM problem. Finally, the EMTM dynamic response of a simplified model of the HL-2M vacuum vessel during plasma vertical disruption events is simulated. According to the simulation results, the EMTM coupling effect is found significant and necessary to be considered for the design and safety evaluation of Tokamak structures.

Optimized Design Method of Dry Type Air Core Reactor Based on Multi-Physical Field Coupling

“…In the literature (Guimarães et al, 2013;Bakshi et al, 2014;Yun et al, 2016), the characteristics of transient electromagnetic forces on transformer windings are analyzed by coupling the electromagnetic forces into a structural field to obtain the winding deformation distribution. As for the optimization design of inductors, the equal-current-phase method is proposed in literature (Ma et al, 2017) to derive a formula for the number of turns of an encapsulation layer coil, which can significantly reduce the inductor losses. A multi-objective optimization algorithm is introduced in literature (Zhang et al, 2010;Chen et al, 2019) for air core reactors, and Pareto solution sets are obtained for reactor metal conductor usage and losses, which can be designed according to the actual engineering requirements.…”

Research on the online measuring technology of inter-turn insulation of dry air-core reactor

“…The air heat dissipation is usually used for the dry air‐core reactors even under the bad environment, which causes occasional accidents. According to the related researches, 95% of accidents were caused by the inter‐turn short circuit [4–8 ]. In order to solve the problem which causes the accident expanding, a new method of inter‐turn insulation fault online monitoring based on the change of the power angle was proposed [9 ].…”