Abstract
The enthalpy extraction ratio is one of the most significant parameter of a disk closed cycle MHD generator. There are two methods to improve the enthalpy extraction, those are the increase of channel cross-sectional area ratio and the implementation of inlet swirl. In this study, the mechanism of enthalpy extraction improvement has been confirmed by the two-dimensional numerical calculation. As a result, by increasing the channel cross-sectional area ratio of the disk MHD generator, the increase of static pressure and the velocity deceleration can be suppressed due to the Lorentz force, and it is possible to maintain a high flow velocity inside the channel and a high Hall parameter. The implemention of inlet swirl is possible to maintain a low static pressure inside the channel and the enthalpy extraction ratio rises due to the increase of Hall parameter. In addition, the channel cross-sectional area ratio increases due to the swirl implementation, the static pressure is kept low, and the channel inlet flow velocity increases. This also leads to the increase of enthalpy extraction ratio, that is the increase of output power.
Highlights
Disk closed cycle MHD (CCMHD) power generation directly converts the thermal and kinetic energy into the electrical energy by flowing a electrical conduction working fluid in the radial direction into a disk channel which is applied by a magnetic field
The increasing of channel cross-sectional area ratio is not effeted at a high load resistance which acts a large Lorentz force on the fluid because of the large development of boundary layer
(2) By implementing an inlet swirl, it is possible to maintain a low static pressure inside the channel and the enthalpy extraction ratio rises due to the increase of Hall parameter
Summary
Disk closed cycle MHD (CCMHD) power generation directly converts the thermal and kinetic energy into the electrical energy by flowing a electrical conduction working fluid in the radial direction into a disk channel which is applied by a magnetic field. There are two methods to improve the enthalpy extraction They are the increase of channel cross-sectional area ratio and the implementation of inlet swirl. It is known that the increase of channel cross-sectional area ratio opposes the velocity deceleration due to strong Lorentz force, and leads to a high flow velocity inside the generator channel. At this time, it puts a low static pressure inside the generator channel and may achieve a high Hall parameter. The mechanism of enthalpy extraction improvement which considers the inlet swirl and the increase of the channel cross-sectional area ratio has been confirmed by the two-dimensional numerical calculation. This study examines the behavior of a boundary layer with different inlet swirl and channel shape and shows the characteristics of the flow field that has received a strong Lorentz force
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