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Research Papers

Flow-Induced Steam Valve Vibrations—A Literature Review of Excitation Mechanisms, Preventive Measures, and Design Improvements

[+] Author and Article Information
Clemens Bernhard Domnick

Chair of Turbomachinery,
University Duisburg-Essen,
Lotharstrasse 1,
Duisburg 47057, Germany
e-mail: bernhard.domnick@uni-due.de

Dieter Brillert

Chair of Turbomachinery,
University Duisburg-Essen,
Lotharstrasse 1,
Duisburg 47057, Germany
e-mail: dieter.brillert@uni-due.de

Manuscript received January 29, 2018; final manuscript received July 31, 2018; published online December 12, 2018. Assoc. Editor: Rakesh K. Bhargava.

J. Eng. Gas Turbines Power 141(5), 051009 (Dec 12, 2018) (14 pages) Paper No: GTP-18-1034; doi: 10.1115/1.4041253 History: Received January 29, 2018; Revised July 31, 2018

Steam turbine inlet valves are used to control the power output of steam turbines for power generation. These valves may be subject to vibration under certain operating conditions, especially in part-load operation. Several research papers and reports show that elevated valve vibrations can result in damage to parts of a steam turbine installation. A comprehensive literature review considering 43 different valves investigated in 51 studies reveals the effects causing vibrations. The physics of these effects are explained and methods for reducing flow-induced dynamic forces are presented based on the findings published in the literature. A classification scheme for typical valve designs is developed and the design features are evaluated in terms of valve vibration. Numerical methods for analyzing the fluid dynamics of valves are also presented.

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Figures

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Fig. 1

Change of the thermodynamic state of a fluid particle that passes a steam valve over time

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Fig. 2

Common valve types for steam turbine installations

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Fig. 3

Definition of flow direction

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Fig. 4

Shape of valve plugs (closed valve position)

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Fig. 5

Definition of vale seat types

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Fig. 6

Jet impingement in a steam valve. Sketch by the author according to Ziada et al. [16].

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Fig. 7

Flow topology in the steam valve diffuser. Sketch by the author according to Heyman and Staiano [13].

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Fig. 8

Flow topologies in flat plug valves according to Schramm et al. [47]

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Fig. 9

Flow topologies in can-shaped valves according to Domnick et al. [40]

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Fig. 10

A valve with convergent-divergent (left side) gap and with a pure convergent (right side) gap

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Fig. 11

The three plug designs developed by Št'astný et al. [19] in comparison. Sketch by the author.

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Fig. 12

Valve with cut valve seat. Sketch by the author according to Pluviose [17].

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Fig. 13

The three plug designs developed by Hardin et al. [18]. Sketch by the author.

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Fig. 14

Generation of the asymmetrical flow field

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Fig. 15

Flow topologies on mushroom-shaped plugs according to Zhang and Engeda [20]

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Fig. 16

Classification of acoustic modes in rotationally symmetrical geometries

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Fig. 17

Propagation of sound in the model valve of Nakano et al. [15]. Sketch by the author.

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Fig. 18

Inhomogeneous inflow in a valve with a can-shaped plug. Sketch by the author according to Liu et al. [28].

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Fig. 19

Valve plug with impinging turbulent flow. Sketch by the author according to Michaud et al. [4].

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Fig. 20

Prestroke valve system. Sketch by the author according to Zaryankin et al. [71].

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Fig. 21

Arrangement of bores in the valve of Tecza et al. [29]. Sketch by the author.

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Fig. 22

Applicability of numerical methods to model effects causing valve vibration

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Fig. 23

Flow topologies related to plug types in forward plug-type valves

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