| 摘要 |
In a nuclear steam generating vessel, a baffle plate (30) disposed a slight distance above the tube sheet (13) has a plurality of openings (35) therethrough for receiving the heat exchanger tubes (22). Each opening (35) has a circular central portion (36) and eight equally spaced peripheral lobe portions (40) alternating with eight lands (37). The inner end of the lands (37) lie on a circle have a diameter slightly greater than that of the associated tube (22). The upper or lower surface of the baffle plate is mechanically deformed adjacent to said lobe portion (40) and constrict the cross-sectional areas thereof to limit liquid flow therethrough. The lands are dimensioned and arranged so that one or two at a time can contact the associated tube, while the constriction of the lobe portion flow areas limits liquid flow therethrough sufficiently to insure proper baffling operation. |
