Application of scalar implicit approximate factorization for underwater magnetohydrodynamic propulsion concept analyses

Choi, D.; Knight, Charles

doi:10.2514/3.11666

Cited by 9 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The details of the numerical scheme for the threedimensional Navier-Stokes equations can be found in Refs. [8][9][10][11]. Some of the unique features of the scheme are described here.…”

Section: Methodsmentioning

confidence: 97%

Numerical investigation of pre-mixed step-combustor instabilities

Wake¹,

Choi²,

Hendricks³

1996

34th Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

A quasi-1D unsteady analysis with loss and heat addition models was developed to simulate combustion instabilities for a premixed step combustor. This analysis utilizes a third-order upwind-biased finite-volume scheme to solve the Euler equations. Time accuracy was achieved by using Newton subiterations within each time step. The ability of the solver to capture the resonant acoustic frequencies was examined by modeling a speaker radiating broadband noise in a simple duct. The additional complexities of the experimental combustor models, such as skin-friction losses, losses due to sudden area change, and the addition of fuel, air, water, and heat were all modeled and included in the governing equations as source terms. Preliminary results compared with experimental data for several combustion rigs indicate that the analysis can capture the critical frequencies of the combustor model. Coupling heat release with step flow velocities produced an instability at the dominant resonant frequency of the combustor. (Author) AbstractA quasi-one-dimensional unsteady analysis with loss and heat addition models was developed to simulate combustion instabilities for a premixed step combustor. This analysis utilizes a third-order upwindbiased finite-volume scheme to solve the Euler equations. Time accuracy was achieved by using Newton sub-iterations within each time step. The ability of the solver to capture the resonant acoustic frequencies was examined by modeling a speaker radiating broad-band noise in a simple duct. The additional complexities of the experimental combustor models, such as skin-friction losses, losses due to sudden area change, and the addition of fuel, air, water and heat were all modeled and included in the governing equations as source terms. Preliminary results compared with experimental data for several combustion rigs indicate that the analysis can capture the critical frequencies of the combustor model. Coupling the heat release with the step flow velocities, produced an instability at the dominant resonant frequency of the combustor.

show abstract

“…The details of the numerical scheme for the threedimensional Navier-Stokes equations can be found in Refs. [8][9][10][11]. Some of the unique features of the scheme are described here.…”

Section: Methodsmentioning

confidence: 97%

Numerical investigation of pre-mixed step-combustor instabilities

Wake¹,

Choi²,

Hendricks³

1996

34th Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

show abstract

“…Concerning the issue of end losses, the authors have seriously considered the effects of end losses in their analysis. Preliminary results from an analysis of end effects have previously been published [2]. The results of these efforts have shown that the magnitude of end losses that might be expected for a well designed, annular thruster are much smaller than for a linear generator or accelerator.…”

Section: Thrustermentioning

confidence: 99%

Authors' Reply

1991

Naval Engineers Journal

View full text Add to dashboard Cite

“…In the field of marine propulsion, perhaps one of the first related patents and manuscripts dates back to 1960s. [23][24][25] Many numerical 21,26,27 and analytical 28,29 simulations as well as experimental [29][30][31][32][33][34][35][36][37] studies have been conducted by some researchers investigating the effects of MHD channel shapes, 27,29 electric and magnetic field strength and patterns (continuous/alternating), 21,32 water conductivity enhancement, 34,37 super-conduction and cooling systems, 30,31,35 and also stability issues 28 on the electro-magnetic thrust production and efficiency of the system. A comprehensive review of this field has been presented by Weier et al 38 In the present paper, a set of parametric studies is conducted on different aspects of a planar MHD propulsion system and their effects on its electromagnetic thrust, efficiency, and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Taguchi parametric analysis of the effects of electrode and magnetic actuator characteristics on Lorentz forces and heat transfer of a weak low-profile magneto-hydrodynamic blanket propulsion system

Chekab

Ghadimi

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Parametric studies are conducted on different aspects of a planar MHD propulsion system called propulsive MHD blanket. Effects of nine different parameters on the electro-magnetic thrust, efficiency, and heat transfer of the blanket are investigated. To efficiently conduct the parametric analysis, the Taguchi test design method is used and 16 cases are defined. The Ansys-CFX commercial code is utilized as numerical solver and the obtained results are validated using the Hartman problem which indicated a negligible error of 0.16%. Electromagnetism, energy, mass, and momentum equations are considered for the fluid domain and heat transfer and electromagnetism equations are solved for the solid domain. On one hand, magnet shapes and type are found to be the highest effective parameters, followed by the electrodes voltage, length, and width. On the other hand, a prediction of the best combination of parameters for obtaining the highest electro-magnetic thrust are statistically accomplished which has produced an electro-magnetic thrust of 18.02 N per square meter for the MHD blanket which is twice the maximum electro-magnetic thrust obtained in the 16 initial test cases. It is demonstrated in the present paper that the unique applications of propulsive MHD blanket can compensate the very low efficiencies of MHD systems. It has also been shown that efficiency can be improved by enhancing the water conductivity, which is intended as a future study.

show abstract

Application of scalar implicit approximate factorization for underwater magnetohydrodynamic propulsion concept analyses

Cited by 9 publications

References 13 publications

Numerical investigation of pre-mixed step-combustor instabilities

Numerical investigation of pre-mixed step-combustor instabilities

Authors' Reply

Taguchi parametric analysis of the effects of electrode and magnetic actuator characteristics on Lorentz forces and heat transfer of a weak low-profile magneto-hydrodynamic blanket propulsion system

Contact Info

Product

Resources

About