Research on the Influence of Axial Applied Magnetic Field on the Performance Characteristics of Disk Magnetohydrodynamic Generator

doi:10.12096/j.2096-4528.pgt.24007

Abstract

Abstract:

Objectives Disk magnetohydrodynamic (MHD) generators hold broad development prospects in clean energy generation and space power supply. The axial applied magnetic field is one of the important operating parameters of the disk MHD generator. To deeply study the influence of the axial external magnetic field on the performance of the disk-type magnetohydrodynamic generator, a physical model of the disk generator is proposed. Methods In this paper, a full flow channel physical model including the inlet, power generation channel, and exhaust channel of the disk MHD generator is established. The influence of the axial applied magnetic field on the flow characteristics, ionization characteristics, and power generation process of the disk MHD generator is analyzed through numerical simulation of the r-z quasi 2-D MHD model. Results Under the 5 T magnetic field, the disk MHD generator achieves high enthalpy extraction ratio and high isentropic efficiency due to the generation of a higher level of Faraday current and plasma stability. Conclusions Through numerical simulation, the performance of the disk MHD generator under different axial magnetic fields is analyzed more accurately. This numerical simulation method is of great significance for improving the operational control accuracy and power generation efficiency of the disk MHD generator under optimal performance conditions.

Key words: disk magnetohydrodynamic (MHD) generator, axial applied magnetic field, non-equilibrium plasma, generator performance, full flow channel physical model, Faraday current, flow and ionization characteristics, cubic interpolation pseudo-particle method

CLC Number:

TK 05

Peiqi ZHU, Aiwu PENG. Research on the Influence of Axial Applied Magnetic Field on the Performance Characteristics of Disk Magnetohydrodynamic Generator[J]. Power Generation Technology, 2025, 46(5): 959-967.

Figures/Tables 15

Fig. 1 Schematic diagram of the disk MHD generator structure

Fig. 2 Shape and structural dimension of the computational domain

Tab.1 Numerical calculation conditions

参数	数值
工质气体	Ar+Cs
入口总压/kPa	405.3
入口总温/K	2 200
出口背压/kPa	30
种子分数	1.0×10^-3
轴向外磁场磁感应强度B/T	3.0、4.0、5.0、6.0、7.0
外接负载电阻/Ω	1.0

Fig. 3 Enthalpy extraction ratio and isentropic efficiency curves of the disk MHD generator under different axial applied magnetic fields

Fig. 4 Potential curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 5 Faraday current density curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 6 Faraday current density contours of the disk MHD generator under different axial applied magnetic induction intensities

Fig. 7 Mach number curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 8 Mach number distribution contours of the disk MHD generator under different axial applied magnetic induction intensities

Fig. 9 Tangential velocity curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 10 Tangential velocity contours of the disk MHD generator under different axial applied magnetic induction intensities

Fig. 11 Electron temperature curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 12 Electron temperature distribution contours of the disk MHD generator under different axial applied magnetic induction intensities

Fig. 13 Electrical conductivity curves of the disk MHD generator in the Z=0 plane under different axial applied magnetic induction intensities

Fig. 14 Electrical conductivity distribution contours of the disk MHD generator under different axial applied magnetic induction intensities

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