Assessment of hypersonic MHD concepts

Bityurin, V. A.; Lineberry, J.T.; Potebnia, V.; Алферов, В. И.; Kuranov, Alexander; Sheikin, E.

doi:10.2514/6.1997-2393

Cited by 41 publications

(14 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally the electric field is calculated using the boundary conditions, knowing its curl from Eq. [3], and its divergence from requiring that Eq. [2] be compatible with ∇•J = 0.…”

Section: The Full Mhd Model and The Low Magnetic Reynolds Number mentioning

confidence: 99%

“…Among the many authors that have done numerical simulations of steady hypersonic MHD flows we mention here Bityurin, Lineberry, Potebnia, et. al., 3 Bityurin and Bocharov, 4 Bityurin, Zeigarnik and Kuranov, 5 Fujino, Kondo and Ishikawa, 6 MacCormack, 7 and Hoffmann, Damevin, and Dietiker. 8 The low diffusion E-CUSP (LDE) scheme with a fifth order WENO scheme recently developed by Zha 1 et al is very good in resolving flow fields with shock discontinuities.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low Rem 3-D MHD Hypersonic Equilibrium Flow Using High-Order WENO Schemes

Lee

Huerta

Zha

2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

View full text Add to dashboard Cite

We present work on 3D hypersonic laminar flows of air around blunt bodies with applied magnetic fields of various strengths. The air is heated by a shock that can change its thermodynamic properties. We treat the air both as a calorically perfect gas (chemically frozen) and as a real gas in thermodynamic equilibrium. Due to the high temperature the thermodynamic properties of the air are affected changes in specific heats due to rotational and vibrational excitation, by molecular dissociation, ionization, and other effects. We calculate the thermodynamic properties of the air using the curve fitting method implemented in the TGAS FORTRAN subroutines. The hot air is partially ionized, but the electrical conductivity of the air is low enough that we can use a low magnetic Reynolds number MHD model. Our numerical method is based on the Low Diffusion E-CUSP (LDE) scheme developed by Zha 1 et al with a 5th order WENO scheme.

show abstract

“…Finally the electric field is calculated using the boundary conditions, knowing its curl from Eq. [3], and its divergence from requiring that Eq. [2] be compatible with ∇•J = 0.…”

Section: The Full Mhd Model and The Low Magnetic Reynolds Number mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low Rem 3-D MHD Hypersonic Equilibrium Flow Using High-Order WENO Schemes

Lee

Huerta

Zha

2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

View full text Add to dashboard Cite

show abstract

“…In recent years, possible application of magnetohydrodynamics (MHD) in high hypersonic systems has generated a lot of excitement [1][2][3][4][5][6]. Using MHD as an integral part of these systems has been suggested for various applications.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement-Learning-based Magneto-hydrodynamic Control of Hypersonic Flows

Kulkarni

Phan

2007

2007 IEEE International Symposium on Approximate Dynamic Programming and Reinforcement Learning

View full text Add to dashboard Cite

In this work, we design a policy-iterationbased Q-learning approach for on-line optimal control of ionized hypersonic flow at the inlet of a scramjet engine. Magneto-hydrodynamics (MHD) has been recently proposed as a means for flow control in various aerospace problems. This mechanism corresponds to applying external magnetic fields to ionized flows towards achieving desired flow behavior. The applications range from external flow control for producing forces and moments on the air-vehicle to internal flow control designs, which compress and extract electrical energy from the flow. The current work looks at the later problem of internal flow control. The baseline controller and Q-function parameterizations are derived from an off-line mixed predictive-control and dynamic-programming-based design. The nominal optimal neural network Q-function and controller are updated on-line to handle modeling errors in the off-line design. The on-line implementation investigates key concerns regarding the conservativeness of the update methods. Value-iteration-based update methods have been shown to converge in a probabilistic sense. However, simulations results illustrate that realistic implementations of these methods face significant training difficulties, often failing in learning the optimal controller on-line. The present approach, therefore, uses a policyiteration-based update, which has time-based convergence guarantees. Given the special finite-horizon nature of the problem, three novel on-line update algorithms are proposed. These algorithms incorporate different mix of concepts, which include bootstrapping, and forward and backward dynamic programming update rules. Simulation results illustrate success of the proposed update algorithms in re-optimizing the performance of the MHD generator during system operation.

show abstract

“…The progress in hypersonic air-breathing engine is outstanding and it is reported recently that the performance of scramjet engines can be improved by MHD energy bypass (6), (7) . In this MHD energy bypass scramjet engine, an MHD generator installed in the engine inlet controls the flow and extracts the flow energy as an electrical power.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Annular Hall Energy Conversion Device under Wide Range of Operating Condition

Takana

Okuno

2005

JSME international journal. Ser. B, Fluids and thermal engineer

View full text Add to dashboard Cite

The characteristics of the annular Hall MHD device under the wide range of operating conditions are investigated in detail by carrying out time-dependent three-dimensional numerical simulations with the purpose of providing fundamental data for the future industrial application of the device. Because of the configuration of the device, it can be operated both as generator and accelerator. Under power extraction, the highest enthalpy extraction of 5% for the load resistance of 3.0 Ω and the highest isentropic efficiency of 15% for 2.0 Ω are obtained. The nonuniform plasma induced by weak ionization of seed forms a clockwise spiral structure in θ − z plane. Due to this unsteady behavior of the discharge, output electrical power fluctuates periodically at the frequency of approximately 20 -40 kHz. Finally, the Lorentz efficiency is evaluated under power input. The highest Lorentz efficiency of 58% can be obtained for −0.5 kV.

show abstract

Assessment of hypersonic MHD concepts

Cited by 41 publications

References 0 publications

Low Rem 3-D MHD Hypersonic Equilibrium Flow Using High-Order WENO Schemes

Low Rem 3-D MHD Hypersonic Equilibrium Flow Using High-Order WENO Schemes

Reinforcement-Learning-based Magneto-hydrodynamic Control of Hypersonic Flows

Numerical Simulation on Annular Hall Energy Conversion Device under Wide Range of Operating Condition

Contact Info

Product

Resources

About