A novel liquid metal MHD enhanced Closed-Brayton-Cycle power generation system for hypersonic vehicles: Thermodynamic analysis and performance evaluation with finite cold source

Cheng, Kunlin; Wang, Yilin; Xu, Jing; Qin, Jiang; Jing, Wuxing

doi:10.1016/j.enconman.2022.116068

Cited by 20 publications

(3 citation statements)

References 39 publications

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“…For the numerical simulations, most scholars adopted the method of electron beam ionization for the MHD control of shock wave system in the inlet, and they conducted a theoretical analysis for the MHD control effect at off-design Mach numbers by establishing an inviscid MHD model and coupling it with an electron beam ionization plasma model. Their results indicated that the captured capacity of gas in the inlet can be effectively improved and the total pressure losses can be greatly reduced by a reasonable selection of the MHD control parameters (Wang et al 2022;Cheng et al 2022;Chang et al 2010;Lee et al 2004;Macheret et al 2003;Shneider et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the MHD flow control of the hypersonic vehicle inlet

Li,

Huang,

Zhu

2024

Preprint

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Under the assumption of the low magnetic Reynolds number, the coupled model of the turbulent flow field and the electromagnetic field is established to simulate the flow characteristics of Weakly Ionized Gas (WIG) in the inlet under the MHD (Magnetohydrodynamic) effect. Results show that WIG has more active thermodynamic properties than that of air in inlet. Specifically, at the throat, the thermal conductivity of WIG is augmented by 1.64 times compared to that of air. For the inlet with an MHD acceleration zone, the separation shock waves will be fallen on the third ramp and converted into the reattachment shock waves here. And the separation bubbles generated by the reattachment shock waves are weakened due to the multiple reflections before entering the isolator, hence, the wall pressure and the skin friction coefficient have a decrease in the isolator. Nevertheless, in the inlet with an MHD deceleration zone, the separation shock waves will be fallen precisely at the throat under the effect of the countercurrent Lorentz force, so that the separation shock waves are directly transformed into reattachment shock waves at the throat and all reflected into the isolator, which leads to the peak manifestation of the wall pressure and the skin friction coefficient in the isolator.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis on the MHD flow control of the hypersonic vehicle inlet

Li,

Huang,

Zhu

2024

Preprint

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“…Magnetohydrodynamics (MHD) or hydromagnetics is the behavior analysis of electrically conducting fluids under the application of a magnetic field. Numerous researchers [1][2][3][4] have worked on MHD for engineering applications. Rashad 5 conducted a quantitative study of the impact of radiation on the MHD natural convection of a Newtonian fluid moving across a vertical flat plate.…”

Section: Introductionmentioning

confidence: 99%

Assessment of heat transfer in large parallel plates with a narrow gap maintained at a constant temperature

et al. 2023

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Investigations are conducted on electromagnetohydrodynamic (EMHD) flow and heat transfer in a third‐grade fluid flowing through large parallel plates, which are maintained at constant temperatures. The impact of convective heat transmission is disregarded since the space between the plates is small. The influence of viscous dissipation is considered. Despite being addressed for Newtonian fluids, the conduction problem with the viscous dissipation effect is not examined in third‐grade fluids for EMHD flow and heat transfer behavior. The least‐square method is adopted to solve nondimensional, nonlinear momentum and energy conservation equations to get the dimensionless velocity, temperature distribution, and heat flux. Temperature and heat flux are investigated in relation to the third‐grade fluid parameter, the Hartmann number, the electric field parameter, and the Brinkman number. The findings show a rise in the Brinkman number dramatically increases heat transfer from both walls, necessitating cooling of both plates. The heat flow from both walls increases as the parameters of third‐grade fluid increases.

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“…The ionization of the seeded metal as well as any minor ionization of the original gases in the plasma occurs at elevated temperatures (Zhou et al, 2023). Alternatively, an electrically conducting liquid metal may be used as a working medium, and in that case seeding is not necessary (Cheng et al, 2022). There are different proposed designs for MHD power generation, such as the open loop or linear channel category (Bera et al, 2022) versus the closed-loop or disc category (Okamura et al, 1985;Okunoa et al, 1999).…”

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confidence: 99%

Detailed and simplified plasma models in combined-cycle magnetohydrodynamic power systems

Marzouk

2023

Int. j. adv. appl. sci.

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Magnetohydrodynamics (MHD) is a subject concerned with the dynamics of electrically conducting fluids (plasma) and can be applied in electric power generation. As a unique technology for producing direct-current electricity without moving parts, it can be utilized within a high-temperature topping power cycle to be combined with a traditional bottoming power cycle, forming a combined-cycle MHD system. This study presents governing equations for the electric field and current density field within a moving plasma subject to an applied magnetic field. The modeling equations are described at four descending levels of complexity. Starting with the first level of modeling, which is the most general case, where no assumptions are made regarding the electric field, plasma velocity field, applied magnetic field, or electrode geometry. In the second level of modeling, the magnetic field is treated as one-dimensional. In the third level of modeling, a specific Faraday-type magnetohydrodynamics plasma generator channel is considered, having two continuous electrodes acting as parallel constant-voltage terminals. In the fourth (and simplest) level of modeling, an additional approximation is made by setting the Hall parameter to zero and replacing all vector fields with scalar quantities. For that simplest model, a representative set of operation conditions (electric conductivity 20 S/m, temperature 2800 K, supersonic plasma gas speed 2000 m/s with Mach 2.134, and magnetic flux density 5 T) shows that the optimum idealized electric power that can be extracted from a unit volume of plasma is estimated as 500 MW/m3. This is a much larger volumetric power density than typical values encountered in reciprocating piston-type engines (0.2 MW/m3) or rotary gas turbine engines (0.5 MW/m3). Such an extremely high power density enables very compact power generation units.

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A novel liquid metal MHD enhanced Closed-Brayton-Cycle power generation system for hypersonic vehicles: Thermodynamic analysis and performance evaluation with finite cold source

Cited by 20 publications

References 39 publications

Numerical analysis on the MHD flow control of the hypersonic vehicle inlet

Numerical analysis on the MHD flow control of the hypersonic vehicle inlet

Assessment of heat transfer in large parallel plates with a narrow gap maintained at a constant temperature

Detailed and simplified plasma models in combined-cycle magnetohydrodynamic power systems

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