Experimental Investigation of Axial Field Limitations in MHD Generators

Unkel, W.; Kruger, C.H.; Koester, J. K.

doi:10.2514/3.62632

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…At these level (K -0.7) the following are the parameters for magnesia: J y = 0.55 A/m 2 , E x = 0.65 kV/m, E y = 2.8 kV/m. These values are well under the limit [11].…”

Section: Electrodynamics Of the Channelmentioning

confidence: 58%

Performance prediction of proposed Indian MHD retrofit channel

Chandra

Bhadoria

1994

IEEE Trans. Plasma Sci.

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“…At these level (K -0.7) the following are the parameters for magnesia: J y = 0.55 A/m 2 , E x = 0.65 kV/m, E y = 2.8 kV/m. These values are well under the limit [11].…”

Section: Electrodynamics Of the Channelmentioning

confidence: 58%

Performance prediction of proposed Indian MHD retrofit channel

Chandra

Bhadoria

1994

IEEE Trans. Plasma Sci.

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“…10 ' 19 " 21 The active section rests between the poles of a conventional iron-core saddle-coil magnet capable of continuous operation at 2.2 T. The electrodes are connected in a Faraday configuration through variable external loads. Groups of lead-acid-batteries can be added in series with the plasma and external load resistors in order to achieve core current densitites in excess of 1.0 A/cm 2 .…”

Section: Measurements Of Acoustic and Entropy Wavesmentioning

confidence: 99%

Acoustic and Entropy Waves in a Nonideal Combustion MHD Generator

1983

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Experimental measurements and a linearized theory using integral transforms examine the growth and attenuation of acoustic and entropy waves in MHD generators of weak interaction. A generalized quasi-onedimensional model for the electrical parameters which includes implicitly some two-and three-dimensional nonideal effects such as boundary layers, heat-transfer, and near electrode phenomena has been included. The wave growth rates are obtained by perturbing the normal acoustic wave solutions with the effects of magnetic interaction. The model predicts that these nonideal phenomena have a mitigating effect on the level of magnetic interaction and may reduce wave growth rates significantly when the boundary-layer resistance is larger than the plasma core resistance. The experimental results suggest the presence of secondary flows which affect the nearelectrode boundary layers and would exist in MHD generators of any scale.= equilibrium sonic velocity = coefficients for nondimensional linearized equations of motion = channel cross-sectional area = poles of determinant of Eq. (11) = magnetic field strength = coefficients for nondimensional linearized equations of motion = specific heat at constant volume = hydraulic diameter = electric field strength --channel height = average heat-transfer coefficient = current density = active MHD channel length = ratio of current, J y /J x --Mach number = molecular weight = pressure = heat loss rate per unit volume = heat-transfer perturbation variable = plasma gas constant = effective boundary-layer resistance = external load resistance = Fourier transform variable = time = normalized time, ta 0 /L = temperature = plasma velocity = normalized augmentation voltage, V/a 0 B 0 h -channel width = axial, transverse, and span wise spatial components = normalized axial spatial component, x/L = constant coefficients of perturbation expansion, Eq. (23) = Hall parameter respectively 7 = ratio of specific heats 6,6* = first-order perturbation coefficients for wave growth e,e* = first-order perturbation coefficients for the wave speeds ju 0 = nondimensional coefficient, Eq. (17) p = mass density a = electrical conductivity O P ,O T = (P 0 /a 0 )(da/dP) T and (T 0 /a 0 )(do/dT) P , respectively 7 = Laplace transform variable = diagonalization angle Subscripts and Superscripts A =anode B= augmentation c = plasma core / = initial condition K = cathode w = wall location 0 = mean, equilibrium value ( )' = fluctuation, normalized on mean value ( ) = vector quantity

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Recent advances in open cycle MHD electrical power generation

Rohatgi

Venkatramani

1984

Sadhana

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The report attempts to summarise the recent developments in the field of MHD electric power generation and identify the problem areas needing further R and D efforts to achieve commercial acceptance of the process. During the last two decades there has been active interest in the development of this technology. A large volume of literature is available in published form, apart from the unpublished information of commercial value. Judging from this standpoint this report cannot be considered exhaustive. Nevertheless it integrates the scattered information in a condensed volume which would be useful in extrapolating the future trends of development while assessing the present status of the technology. To make this report self-contained and complete, the fundamental principles of MMD power generation have also been included.

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Experimental Investigation of Axial Field Limitations in MHD Generators

Cited by 7 publications

References 4 publications

Performance prediction of proposed Indian MHD retrofit channel

Performance prediction of proposed Indian MHD retrofit channel

Acoustic and Entropy Waves in a Nonideal Combustion MHD Generator

Recent advances in open cycle MHD electrical power generation

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