Magnetohydrodynamic Augmented Propulsion Experiment: I. Performance Analysis and Design

Litchford, Ron J.; Cole, John W.; Lineberry, J.T.; Chapman, J.N.; Schmidt, H. J.; Lineberry, Charles

doi:10.2514/6.2002-2184

Cited by 36 publications

(11 citation statements)

References 15 publications

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“…For the special case in which no current flows along the magnetic field lines, ( j z = 0), it is readily shown that equation (1) reduces to the compact form…”

Section: Generalized Ohm's Lawmentioning

confidence: 99%

“…Litchford et al discuss the operational attributes that are of particular significance to these applications and provide an indepth historical perspective of their technological development. 1 From a fundamental point of view, the essential argument favoring the utilization of a Lorentz force acceleration mechanism is the ability to avoid the inherent physical limitations encountered with pure thermal approaches (viz, material thermal limits and ionization/dissociation losses). Simply put, it is more effective to transfer electrical energy into directed kinetic energy rather than first degrading it to thermal energy.…”

Section: Introductionmentioning

confidence: 99%

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Performance Theory of Diagonal Conducting Wall Magnetohydrodynamic Accelerators

Litchford

2004

Journal of Propulsion and Power

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“…For the special case in which no current flows along the magnetic field lines, ( j z = 0), it is readily shown that equation (1) reduces to the compact form…”

Section: Generalized Ohm's Lawmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Theory of Diagonal Conducting Wall Magnetohydrodynamic Accelerators

Litchford

2004

Journal of Propulsion and Power

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“…A magnetohydrodynamics (MHD) accelerator is a significant candidate for a space propulsion system using a scramjet MHD bypass system. [1][2][3][4][5][6][7][8] This MHD bypass system is simple in principle and useful because part of the MHD accelerator can generate considerable acceleration and high-speed gas (plasma) due largely to the interaction of the working gas and the applied magnetic field when supplying an electric field (extracted energy from MHD generator part). However, most of published works focus on the linear MHD accelerator, [1][2][3][4][5][6][7][8] which has some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Performance of Disk-shaped Magnetohydrodynamics Accelerator

Takeshita

Buttapeng

Furuya

et al. 2011

Trans. Japan Soc. Aero. S Sci.

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This paper investigates the acceleration performance of a disk-shaped magnetohydrodynamics (MHD) accelerator. Quasi-1-dimensional (Q1D) numerical simulation employing the MacCormack scheme was developed. For the longer channel length of 0.9 m, thermal loss was estimated at over 60% and effective acceleration could not be achieved owing to large heat loss and large friction loss. For shorter channel lengths, thermal loss can be reduced below 20% owing to the smaller heat and the friction losses. However, with too short a channel length, accelerator performance was decreased by the MHD compression due to excessive Faraday current density. The effect of ratio of cross sectional area on performance was also studied. For a larger area ratio, the gas can be accelerated smoothly throughout the MHD channel. However, for the excessive expansion case of a sevenfold channel, gas velocity near the exit decreased due to transition to a ''generator mode''. For the best acceleration performance, the design channel length should be as short as possible preventing compression at the channel inlet. The area ratio should be large enough to prevent the compression but not too large, to prevent transition to a ''generator mode''.

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“…A summary description of the project was previously published that included a thorough historical account of preceding MHD accelerator research programs, a detailed description of the experiment configuration, and results from a preliminary quasi-one-dimensional engineering performance analysis and design study. 1 A recent status update for the project has summarized hardware design and development progress over the intervening time period. 2 In parallel with this work, a three-dimensional numerical model based on the parabolized Navier-Stokes (PNS) approximation was developed to provide a comprehensive analysis of MHD accelerator performance.…”

Section: Introductionmentioning

confidence: 99%