Effects of Uneven Flow on 90.DEG.-Bend Flowmeters. Uneven Flow in the Two-Dimensional Bend Plane.

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  • ９０°ベンド流量計に流入する不均一流れの考察　曲がり平面内の不均一流れの場合
  • 90 ベンド リュウリョウケイ ニ リュウニュウスル フキンイツ ナガレ ノ

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Abstract

The effects of uneven flow on the discharge coefficients and flow patterns of 90°-bend flowmeters with a square cross-section have been studied experimentally. Flows having a stepped velocity profile were introduced to the bend flowmeters with various radius ratios. The results obtained are summarized as follows : (1) The uneven flow patterns introduced in the straight duct become uniform within a distance of approximately 50 times the duct width. (2) The uneven velocity profiles caused upstream the inlet of flowmeters are largely deformed inside the bend correspondence to the coefficients of uneven parameter δ. (3) With decrease of the radius ratio R/a, the effects of the uneven flow through the bend flowmeter on discharge coefficients are also decreased.

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