| 摘要 |
PURPOSE:To unify a reaction speed regardless of a gradual decrease of the effective component ratio toward the outlet from the inlet by shrinking the cross section of a groove formed by a bipolar plate or porous plate with rib and an electrode or airtight plate at a larger rate than the volume decreasing rate due to the reaction of the reaction fluid. CONSTITUTION:The cross section of a fuel passage is shrunk toward the plane direction of a bipolar plate. The decreasing rate of the passage cross section is made larger than that of a partition 16a according to the conventional design concept that the cross section of the fuel passage 4 is reduced in proportion to a decrease of the fuel volume so as to keep the fuel flow speed contant and a partition 16b is provided to gradually increase the flow speed, thereby the reaction speed is unified. Inlet manifolds 17a, 17c and outlet manifolds 17b, 17d are provided in a pair respectively. Since the fuel flow speed is gradually increased toward the outlet from the inlet, the boundary membrane near the electrode surface is made thin, and the average distance between the gas and electrode becomes smaller, thus a decrease of the reaction speed due to the reduction of the hydrogen partial pressure is compensated and a unified reaction is attained. |
