PURPOSE: To obtain a disk-shaped MHD generator which prevents a ceramic insulating wall from being cracked due to a thermal stress by a method wherein a torus-shaped electrode on the side of a discharge dust is formed so as to be divided in the circumferential direction.
CONSTITUTION: Ceramic insulating walls 6 are interposed between a torus-shaped electrode 4 and a torus-shaped electrode 5, and edges of every insulating wall 6 are tapered. The torus-shaped electrode 5 is divided into a plurality of parts in the circumferential direction in dividing parts 5a. The electrode 5 is moved in the radial direction due to the slip of a mounting bolt for the electrode with reference to the expansion in the radial direction of every ceramic insulating wall 6 so as to absorb a thermal stress, and a thermal stress due to thermal expansion is not generated. Consequently, it is possible to prevent ceramic insulating walls from being cracked due to the thermal stress.
HORIOKA RYUJI
OSADA ISAMU
HASHIZAKI KATSUO
OMURA NAOKI
