Tác giả :

Analyze the channel characteristics of a disk closed cycle magnetohydrodynamic generator to improve the enthalpy extraction ratio

Nobuhiro Harada1, Takashi Kikuchi1

1Tokyo Institute of Technology

Received 19/02/2016, Peer reviewed 04/03/2016, Accepted for publication 15/03/2016

ABSTRACT

The enthalpy extraction ratio is one of the most significant parameter of a disk closed cycle MHD power 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 and a high Hall parameterinside the channel. 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 leads to the increase of enthalpy extraction ratio, that is the increase of output power.

Keywords: disk MHD generator; enthalpy extraction ratio; inlet swirl; Hall parameter; static pressure
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