Impact of Flow Velocity Profile on Ultrasonic Measurement Accuracy for Feedwater Flow in Nuclear Power Plants

10th International Conference on Nuclear Engineering, Volume 1 ◽

10.1115/icone10-22591 ◽

2002 ◽

Author(s):

E. Hauser ◽

J. Regan ◽

H. Estrada

Keyword(s):

Velocity Profile ◽

Flow Velocity ◽

Power Plants ◽

Velocity Profiles ◽

Nuclear Plant ◽

Flow Profile ◽

Practical Applications ◽

Flow Velocity Profile ◽

The Impact ◽

Profile Development

This paper discusses the nature of flow velocity profiles in nuclear plant feedwater system piping, and the impact of flow profile development on flow measurement. The mechanism for flow velocity profile development is described, and the influence of upstream pipe fittings and the relative roughness of the piping inside diameter on flow development is illustrated. The paper defines fully developed flow profiles and illustrates, using several practical applications, how velocity profiles in nuclear plant feedwater piping are rarely fully developed.

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Experimental Investigation of Mean Flow Profile Effects on Impedance Eduction

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-3332 ◽

2021 ◽

Vol 263 (1) ◽

pp. 5858-5868

Author(s):

Victor Kopiev ◽

NIkolay Ostrikov ◽

Stanislav Denisov ◽

MIkhail Yakovets ◽

Maxim Ipatov

Keyword(s):

Velocity Profile ◽

Flow Velocity ◽

Cross Section ◽

Three Dimensional ◽

Descent Method ◽

Gradient Descent Method ◽

Flow Profile ◽

Mean Flow ◽

Flow Velocity Profile ◽

Made In

The results of experimental and computational studies of the three-dimensional mean flow velocity profile influence on the impedance eduction are presented. In order to measure the three-dimensional velocity profile, the TsAGIâ€(tm)s â€œInterferometer with flowâ€ facility was upgraded so that additional holes were made in one cross section of the rectangular duct. As a result, it became possible to measure the longitudinal flow velocity in this cross section along 6 lines using a Pitot tube or a hot wire anemometer. The full three-dimensional velocity profile is determined by interpolating the values measured.Experimental results of the velocity profile for various experiment conditions are presented. Based on the numerical solution of the three-dimensional Pridmore-Brown equation by means of Finite Element Method and the gradient descent method, the problem of impedance eduction are investigated. The influence of the flow velocity profile and the form of functional on the obtained impedance values are discussed. The impedance values educted by means of this approach are compared with the impedance values obtained using two-dimensional impedance eduction methods, which didnâ€(tm)t taking into account the three-dimensional non homogeneity of the flow velocity field.

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Investigation of the influence of the flow structure on the accuracy of flow measurement before a hydrometric structure in an open channel

Melioration and Water Management ◽

10.32962/0235-2524-2019-5-41-44 ◽

2020 ◽

pp. 41-44

Author(s):

Anatoly Kusher

Keyword(s):

Velocity Profile ◽

Flow Velocity ◽

Water Flow ◽

Flow Measurement ◽

Water Discharge ◽

Critical Depth ◽

Flow Measurements ◽

Study Results ◽

Flow Velocity Profile ◽

Upstream Flow

The reliability of water flow measurement in irrigational canals depends on the measurement method and design features of the flow-measuring structure and the upstream flow velocity profile. The flow velocity profile is a function of the channel geometry and wall roughness. The article presents the study results of the influence of the upstream flow velocity profile on the discharge measurement accuracy. For this, the physical and numerical modeling of two structures was carried out: a critical depth flume and a hydrometric overfall in a rectangular channel. According to the data of numerical simulation of the critical depth flume with a uniform and parabolic (1/7) velocity profile in the upstream channel, the values of water discharge differ very little from the experimental values in the laboratory model with a similar geometry (δ < 2 %). In contrast to the critical depth flume, a change in the velocity profile only due to an increase in the height of the bottom roughness by 3 mm causes a decrease of the overfall discharge coefficient by 4…5 %. According to the results of the numerical and physical modeling, it was found that an increase of backwater by hydrometric structure reduces the influence of the upstream flow velocity profile and increases the reliability of water flow measurements.

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