标准编号：ISO 7194:2008
中文名称：封闭管道中流体流量的测量 在旋涡流或非对称流条件下用流速计或皮托静压管对环形管道进行流量测量的速度-面积法
英文名称：Measurement of fluid flow in closed conduits — Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes
发布日期：2008-07
标准范围
This International Standard specifies velocity-area methods for measuring flow in swirling or asymmetric flowconditions in circular ducts by means of current-meters or Pitot static tubes.It specifies the measurements required, the precautions to be taken, the corrections to apply, and describesthe additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has tobe made.Only flows with a negligible radial component are considered, however. Furthermore, it is not possible to makea measurement in accordance with this International Standard if, at any point in the measuring cross-section,the local velocity makes an angle of greater than 40~ with the axis of the duct, or where the index ofasymmetry Y (defined in Annex F) is greater than 0,15.This International Standard deals only with instruments for measuring local velocity as defined in ISO 3354and ISO 3966. If Pitot static tubes are used, this International Standard applies only to flows where the Machnumber corresponding to local velocities does not exceed 0,25.
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