Measuring method for flow speed or flow rate |
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| 申请号 | JP2271180 | 申请日 | 1980-02-27 | 公开(公告)号 | JPS56119856A | 公开(公告)日 | 1981-09-19 |
| 申请人 | Hitachi Ltd; | 发明人 | UEMATSU MAKOTO; | ||||
| 摘要 | PURPOSE:To measure the average flow speed and flow rate irrespective of the size of a waterway and the roughness of its wall, by measuring both the flow speed at the water level, at which the average flow speed and partial flow speed are equal, and said level, in the measurement of flow rate at the opening waterway having circular section. CONSTITUTION:If water level (h) is equal to D/2 in waterway 1 having circular section, specific diameter depth R0 is R0=1, namely, diameter depth R is R=D/4 and at this time, the average flow speed Vav of the section of waterway is equal to partial flow speed V0.23D of the part at height 0.23D from the bottom of waterway. When h D/2, Vav V0.23D, but derivation from the manning equation results in Vav=V0.23D.R/(D/4)=R0.V0.23D. For this purpose, flow speed detectors 2 and 3 are placed at height 0.23D from the bottom of waterway and average flow speed V0.23D is measured at water level h=D/2 and held at arithmetic part 7. Water level (h) is measured by water level detector 5, so that specific diameter depth R0 is calculated in the part 7. When h=D/2, Vav=V0.23D is output and when h D/2, held V0.23D is used to calculate and output Vav. | ||||||
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| 说明书全文 | |||||||
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