| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow measuring instrument capable of forming a flow passage easily to straighten a fluid and to bring a velocity distribution of the fluid into a two-dimensional flow. SOLUTION: Straightening vanes 30, 32 are projected in left and right wall parts 20, 22 forming the rectangular flow passage 12 along the flow passage. Hence, the rectangular flow passage 12 is not required to be divided into plural flow passages. The straightening vanes 30, 32 are easily attached to the left and right wall parts 20, 22 since the vanes 30, 33 are not required to be arranged precisely.
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