Numerical simulation of the inhomogeneous discharge structure in noble gas MHD generators

Hara, Takehisa; Veefkind, A.; Rietjens, L.H.Th.

doi:10.2514/3.7989

Cited by 29 publications

(9 citation statements)

References 4 publications

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“…The resulting secondorder partial differential equation is solved for the potential by the Galerkin FEM, and the results are then substituted again into Eqs. (17) to (20).…”

Section: Calculation Methodsmentioning

confidence: 99%

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Numerical simulation of blow‐down closed‐cycle disk MHD generator

Inui

Itô

Ishida

2004

Electrical Engineering Japan

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SUMMARYNumerical simulations of the closed-cycle disk MHD generation experiment with Tokyo Institute of Technology's Fuji-1 blow-down facility are performed. In the calculations, the r-z two-dimensional time-dependent simulation code developed by the authors that can take the effect of water contamination into account is used, and the experimental conditions of Run A4109 operated by Disk-F4 generator are selected as the numerical conditions. When the water contamination is the lowest level realized in the experiments, the simulation results coincide with the experimental results reasonably well, though there exist some discrepancies caused by inaccuracy of used basic plasma parameters, limitations of the two-dimensional approximation, and so on. The voltage-current curve is almost linear, indicating that the MHD interaction is relatively weak and the flow field is mainly determined by the backpressure. The increase of the water contamination level results in decreased seed ionization rate at the generator channel inlet, leading to the steep deterioration of the generator performance.

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“…The resulting secondorder partial differential equation is solved for the potential by the Galerkin FEM, and the results are then substituted again into Eqs. (17) to (20).…”

Section: Calculation Methodsmentioning

confidence: 99%

“…The collision cross-sectional area for argon atoms and cesium atoms is taken from Ref. 17. As regards water molecules, which also are considered in this study, data reported in Ref.…”

Section: Calculation Methodsmentioning

confidence: 99%

Numerical simulation of blow‐down closed‐cycle disk MHD generator

Inui

Itô

Ishida

2004

Electrical Engineering Japan

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“…(5), which is Ohms equation, and introducing a potential I into it with I as a variable. Moreover, the characteristic curve method [9] is used in the determination of ion density by solving Eqs. (8) and (9).…”

Section: Mhd Generatormentioning

confidence: 99%

Operation and control of coupled nonequilibrium disk MHD generator and inverter system under power line fault condition

Inui¹,

Ishikawa²,

Hayashida

1999

Elect. Eng. Jpn.

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Numerical simulations of detailed time‐dependent behavior are performed on a simulation model in which a coupled system of nonequilibrium disk MHD generator and line‐commutated inverter is connected to an infinite bus through the transmission line, showing that continuous operation of the system is usually possible even when a power line fault occurs near the system. Then, time‐dependent swing simulations are carried out on another simulation model in which the MHD/inverter system and a synchronous generator are connected in parallel to an infinite bus through the common transmission line, revealing that the rotor angle swing of the synchronous generator caused by the power line fault can be effectively suppressed by the fast output power control of the MHD/inverter system. © 1999 Scripta Technica, Electr Eng Jpn, 127(3): 13–24, 1999

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“…The electron temperature is obtained from the electron energy equation neglecting the radiative loss: + \-r-A + l-r-* (3) and the ionization levels of both the working fluid and the seed are determined as functions of time from the solution of a system of equations formed by the conservation of charges and the kinetic rate equations for each species. The length of each time step At is the smallest value obtained from the following expression at all grid points: (4) where Cr is the Courant number and is less than unity, c is the sonic velocity, and B is a constant close to unity.…”

Section: Technical Notes 479mentioning

confidence: 99%