| 摘要 |
Provided is a flow path structure equipped with wall surfaces (lOb, 11b) that form a flow path, structures (12, 13) provided extending from the aforementioned wall surfaces in a direction intersecting the primary flow direction of the fluid flowing in the flow path, and recess formation regions (20, 30) in which recesses (21, 22, 31, 32) are formed in the aforementioned wall surfaces across a range in the primary flow direction that includes the aforementioned structures. The aforementioned structures occupy a portion of the flow path in the cross section of the flow path that intersects the aforementioned primary flow, and thus the cross-sectional area of the flow path changes as the flow path proceeds in the primary flow direction. |
