Status of Magnetohydrodynamic Augmented Propulsion Experiment

Litchford, Ron J.; Lineberry, J.T.

doi:10.2514/6.2007-3884

Cited by 7 publications

(3 citation statements)

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“…This acceleration system has the advantage of high thrust-producing capability with less propellant consumption, while the system's construction can be made to small. In general, it is known that the concept of MHD acceleration is quite widely studied, particularly the linear-shaped MHD accelerator (1) (2) .…”

Section: Introductionmentioning

confidence: 99%

Acceleration Effect of Swirl Flow for Disk MHD Accelerator

Takeshita

Buttapeng

2010

IEEJ Trans. PE

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The purpose of this study is to verify how the swirl vane influences the acceleration performance, namely, the radial gas velocity and the static gas pressure, for the Disk MHD accelerator. A quasi-1-dimensional (Q1D) numerical program is used for the calculations. Results of the current calculations show that the static gas pressure decreases approximately 40% when using the inlet swirl vane. It is found that the MHD compression phenomena, which generates at the closest to the MHD channel inlet due to the Joule heating, could suppress effectively. The maximum radial gas velocity of 3,380 m/s is successfully achieved at the channel exit when swirl ratio was −1.0, and swirl ratio was set to be 0.0 and mass flow rate was kept the same as that for the case of swirl ratio of 1.0 and −1.0. The acceleration efficiency of 40.5% and 36.7% are calculated when the swirl ratio is −1.0, and the case of swirl ratio was set to be 0.0 and mass flow rate was kept the same as that for the case of swirl ratio of 1.0 and −1.0 respectively. The difference of efficiency is due to increase the Hall parameter in the upstream and midstream of MHD channel. This current study can show and confirm the function of inlet swirl for Disk MHD accelerator.

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Section: Introductionmentioning

confidence: 99%

Acceleration Effect of Swirl Flow for Disk MHD Accelerator

Takeshita

Buttapeng

2010

IEEJ Trans. PE

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“…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. This new model was evolved from a preexisting three-dimensional numerical model previously validated for MHD generator performance, 3 and was modified to incorporate the NASA Chemical Equilibrium with Applications (CEA) code 4 as a means of calculating thermodynamic and species concentrations properties for the estimation of thermoelectric properties of partially ionized gases using a fundamental technique based on electron-neutral momentum transfer cross sections.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Modeling of the Magnetohydrodynamic Augmented Propulsion Experiment

Turner

Hawk

Litchford

2008

46th AIAA Aerospace Sciences Meeting and Exhibit

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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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Status of Magnetohydrodynamic Augmented Propulsion Experiment

Cited by 7 publications

References 1 publication

Acceleration Effect of Swirl Flow for Disk MHD Accelerator

Acceleration Effect of Swirl Flow for Disk MHD Accelerator

Three-Dimensional Numerical Modeling of the Magnetohydrodynamic Augmented Propulsion Experiment

Fundamental Performance of Disk-shaped Magnetohydrodynamics Accelerator

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