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Journal articles on the topic 'Steam Valve'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Zhan, Tu, Lin Fuhai, and zhang zhouquan. "Analysis of Causes of Valve Rod Fracture of Steam Turbine High Pressure Main Steam Valve." IOP Conference Series: Earth and Environmental Science 304 (September 18, 2019): 032026. http://dx.doi.org/10.1088/1755-1315/304/3/032026.

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2

Janson, Ernest N. "STRESSES IN STEAM-BALANCED VALVE GEARS." Journal of the American Society for Naval Engineers 26, no. 4 (March 18, 2009): 1165–81. http://dx.doi.org/10.1111/j.1559-3584.1914.tb00348.x.

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3

YONEZAWA, Koichi, Ryohei OGAWA, Kanako OGI, Tomofumi TAKINO, Yoshinobu TSUIJIMOTO, Takahide ENDO, Kenichi TEZUKA, Ryo MORITA, and Fumio INADA. "Flow-Induced Vibration of Valve Head of Steam Control Valve." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77, no. 776 (2011): 1098–110. http://dx.doi.org/10.1299/kikaib.77.1098.

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4

Zhang, D., A. Engeda, J. R. Hardin, and R. H. Aungier. "Experimental study of steam turbine control valves." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 5 (May 1, 2004): 493–507. http://dx.doi.org/10.1243/095440604323052283.

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Because of the converging-diverging configuration of the valve passage, venturi valves have been widely used in large turbines to regulate inlet flow as turbine governing valves for about half a century. From the 1960s, a number of valve failure incidents have been reported. Improvement to current designs was strongly demanded but, owing to the complicated nature of the fluid-structure interaction mechanisms, the basic mechanism causing valve failure is still far from being fully understood. Experimental investigations on a half-scale valve were performed here. The study confirmed that asymmetric unstable flow is the root cause of valve problems, such as noise, vibration and failure.

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5

MORITA, Ryo, Fumio INADA, Michitsugu MORI, Kenichi TEZUKA, and Yoshinobu TSUJIMOTO. "Flow Oscillation on the Steam Control Valve : Effects of valve/valve seat shape." Proceedings of the Fluids engineering conference 2004 (2004): 151. http://dx.doi.org/10.1299/jsmefed.2004.151.

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6

Michaud, Suzanne, Samir Ziada, and Henri Pastorel. "Acoustic Fatigue of a Steam Dump Pipe System Excited by Valve Noise." Journal of Pressure Vessel Technology 123, no. 4 (May 23, 2001): 461–68. http://dx.doi.org/10.1115/1.1400741.

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The steam dump system in Gentilly Nuclear Power Plant consists of four parallel steam pipes, each of which comprises a steam control valve. Two pipes of this system experienced high-cycle fatigue damage. In-situ vibration and dynamic strain measurements were therefore conducted to identify the cause of the damage and formulate suitable counter-measures. The test results pointed to the high-frequency noise of the valve as the primary source causing the fatigue failure. By means of small-scale model tests, using a compressed air network, a new valve stem was developed, which produces a substantially lower noise level than that generated by the original valve stem. Implementing this new stem in the plant, without any other modifications in the valve body or the piping system, significantly reduced the dynamic stresses of the piping, but increased the vibration level of the valve itself. An alternative valve stem, which is a simpler version of the new design, was therefore tested and found to reduce the pipe stresses sufficiently while not increasing the level of valve vibration.

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7

Ipohorski, M., M. I. Luppo, R. Castillo-Guerra, and J. Ovejero-Garcı́a. "Failure analysis of a steam valve stem." Materials Characterization 50, no. 1 (January 2003): 23–30. http://dx.doi.org/10.1016/s1044-5803(03)00105-0.

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8

Harrell, Greg, and Richard Jendrucko. "Steam Turbine Versus Pressure Reducing Valve Operation." Cogeneration & Distributed Generation Journal 18, no. 2 (May 1, 2003): 25–36. http://dx.doi.org/10.1080/10668680309509016.

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9

Xingsheng, Lao, Gong Xian, Dai Lu, Lyu Weijian, and Zhang Wei. "Noise Reduction Design of Steam Control Valve." Journal of Physics: Conference Series 1965, no. 1 (July 1, 2021): 012017. http://dx.doi.org/10.1088/1742-6596/1965/1/012017.

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10

OOISHI, Tsutomu, Fumiio OOTOMO, Yasunori IWAI, Yoshiki NIIZEKI, and Tomoo OOFUJI. "E101 Development of High Performance Steam Stop/Control Valve for Steam Turbine." Proceedings of the National Symposium on Power and Energy Systems 2010.15 (2010): 159–62. http://dx.doi.org/10.1299/jsmepes.2010.15.159.

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11

TAKINO, Tomofumi, Kouichi YONEZAWA, Yoshinobu TUJIMOTO, Kenichi TEZUKA, and Takahide ENDOU. "704 Flow-Induced Vibration of Valve Head of Steam Control Valve." Proceedings of Conference of Kansai Branch 2011.86 (2011): _7–4_. http://dx.doi.org/10.1299/jsmekansai.2011.86._7-4_.

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12

Poljak, Igor, Josip Orović, Mate Kosor, and Leon Šimurina. "Steam Flow Pressure Reduction Valve Mass Flow Calculation." Pomorstvo 33, no. 2 (December 19, 2019): 247–54. http://dx.doi.org/10.31217/p.33.2.16.

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In this paper an analysis of the three different calculation methods for the steam mass flow through the linear pressure reduction valve is presented. Two different makers developed their own mass flow calculation method while one is following recommendation as per ISO standard calculation guidance. All three methods were varied and compared. For calculation model a superheated steam reduction valve was taken, which is reducing superheated steam pressure from 6 to 2 MPa, with fixed Kv value and with variations of the inlet superheated steam temperature from 310 to 280 °C.

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13

MORITA, Ryo, and Fumio INADA. "3710 Steam Experiments and Calculations of Pressure Fluctuations on the Steam Control Valve." Proceedings of the JSME annual meeting 2006.7 (2006): 47–48. http://dx.doi.org/10.1299/jsmemecjo.2006.7.0_47.

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14

MORITA, Ryo. "0601 Steam Experiments and Calculations of Pressure Fluctuations on the Steam Control Valve." Proceedings of the JSME annual meeting 2007.3 (2007): 123–24. http://dx.doi.org/10.1299/jsmemecjo.2007.3.0_123.

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15

YONEZAWA, Koichi, Ryohei OGAWA, Kanako OGI, Tomofumi TAKINO, Yoshinobu TSUJIMOTO, Takahide ENDO, and Kenichi TEZUKA. "Measurement of Fluid Forces on a Valve Head of Steam Control Valve." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 79, no. 803 (2013): 1243–53. http://dx.doi.org/10.1299/kikaib.79.1243.

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16

Kim, Dong Hwan, Dong Hyun Kim, and Gyeong Joong Ryu. "Thermal Structural Analysis of Steam Trap Bimetal Valve." Korean Journal of Air-Conditioning and Refrigeration Engineering 24, no. 11 (November 10, 2012): 799–805. http://dx.doi.org/10.6110/kjacr.2012.24.11.799.

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17

Bolek, Wiktor, Jerzy Sasiadek, and Tadeusz Wisniewski. "Two-Valve Control of a Large Steam Turbine." IFAC Proceedings Volumes 33, no. 5 (April 2000): 317–22. http://dx.doi.org/10.1016/s1474-6670(17)40977-3.

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18

Bolek, Wiktor, Jerzy Sasiadek, and Tadeusz Wisniewski. "Two-valve control of a large steam turbine." Control Engineering Practice 10, no. 4 (April 2002): 365–77. http://dx.doi.org/10.1016/s0967-0661(01)00153-8.

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19

YONEZAWA, Koichi, Yosuke TOYOHIRA, Yoshinobu TSUJIMOTO, Kenichi TEZUKA, Michitsugu MORI, Ryo MORITA, and Fumio INADA. "310 Flow Induced Vibration in Steam Control Valve." Proceedings of the Dynamics & Design Conference 2006 (2006): _310–1_—_310–6_. http://dx.doi.org/10.1299/jsmedmc.2006._310-1_.

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20

POTTER, JAMES H. "MODEL TEST ON A STEAM TURBINE INLET VALVE." Journal of the American Society for Naval Engineers 67, no. 4 (March 18, 2009): 1039–45. http://dx.doi.org/10.1111/j.1559-3584.1955.tb03176.x.

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21

Yonezawa, Koichi, Ryohei Ogawa, Kanako Ogi, Tomofumi Takino, Yoshinobu Tsujimoto, Takahide Endo, Kenichi Tezuka, Ryo Morita, and Fumio Inada. "Flow-induced vibration of a steam control valve." Journal of Fluids and Structures 35 (November 2012): 76–88. http://dx.doi.org/10.1016/j.jfluidstructs.2012.06.003.

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22

Neidel, A., E. Cagliyan, and B. Fischer. "Scaling of Steam Turbine Control Valve Guidance Pins." Practical Metallography 58, no. 4 (April 1, 2021): 216–23. http://dx.doi.org/10.1515/pm-2021-0016.

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Abstract Severe scaling caused the guiding pin of two control valves of a smaller industrial steam turbine to seize which thus led to a malfunction. The customer sought clarification on whether the oxidation products are really common scale. This could be confirmed.

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23

HUANG, Xijun. "Valve Characteristics and Economic Operation for Steam Distribution Mode of Ultra-supercritical Steam Turbine." Journal of Mechanical Engineering 54, no. 22 (2018): 168. http://dx.doi.org/10.3901/jme.2018.22.168.

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24

Amano, R. S., and G. R. Draxler. "High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow." Journal of Propulsion and Power 18, no. 3 (May 2002): 555–60. http://dx.doi.org/10.2514/2.5996.

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25

Yan, Guishan, Zhenlin Jin, Tiangui Zhang, and Penghui Zhao. "Position Control Study on Pump-Controlled Servomotor for Steam Control Valve." Processes 9, no. 2 (January 25, 2021): 221. http://dx.doi.org/10.3390/pr9020221.

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In steam turbine control and actuation, the steam control valve plays a key role in operability and reliability. The electrohydraulic regulating system for the steam control valve, usually called the servomotor, needs to be reliable and high performing under nonlinear excitation interference in actual conditions. Currently, electrohydraulic servo valve control technology is widely used in servomotors. Although this technology has good control performance, it still has some technical defects, such as poor antipollution ability, low energy efficiency, large volume size, and limited installation space. Aiming at the abovementioned technical shortcomings of electrohydraulic servo valve control technology, a servomotor-pump-hydraulic cylinder volume control scheme is proposed in this paper, forming a pump-controlled servomotor for the steam control valve. By analyzing the working principle of the pump-controlled servomotor position control in the steam control valve, the mathematical model of a pump-controlled servomotor for the steam control valve is established. The sliding mode variable structure control strategy is proposed, and the variable structure control law is solved by constructing a switching function. To verify the performance of the proposed control method, experimental research was conducted. The research results show that the proposed sliding mode variable structure control strategy has a good control effect, which lays the theoretical and technical foundation for the engineering application and promotion of pump-controlled servomotors for steam control valves and helps the technical upgrade and product optimization of steam turbines.

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26

MORITA, Ryo, Fumio INADA, Michitsugu MORI, Kenichi TEZUKA, and Yohinobu TSUJIMOTO. "730 Flow-Induced Vibration on a Steam Control Valve." Proceedings of the Dynamics & Design Conference 2004 (2004): _730–1_—_730–4_. http://dx.doi.org/10.1299/jsmedmc.2004._730-1_.

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27

Yin, Changjie, and Jizhen Liu. "Study on Valve Management of DEH for Steam Turbine." Energy and Power Engineering 05, no. 04 (2013): 319–23. http://dx.doi.org/10.4236/epe.2013.54b063.

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28

Gao, Qingshan, Li Ding, and Diangui Huang. "Experimental and numerical study on loss characteristics of main steam valve strainer in steam turbine." Applied Thermal Engineering 147 (January 2019): 935–42. http://dx.doi.org/10.1016/j.applthermaleng.2018.07.031.

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29

Pluviose, M. "Stabilization of Flow Through Steam-Turbine Control Valves." Journal of Engineering for Gas Turbines and Power 111, no. 4 (October 1, 1989): 642–46. http://dx.doi.org/10.1115/1.3240305.

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After observing the abrupt variations in flow on an aerodynamic model having the form of a conventional valve, modifications in the basic geometry of the valve are proposed in order to stabilize the flow. The instabilities are almost completely eliminated by introducing an exergy-destructive element into the design of the valve head and seat.

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30

Qu, Dong Yue, Zhong Yuan Guo, and Chong Liu. "Numerical Study on Mechanical Characteristics of Steam Turbine Valve Disc." Key Engineering Materials 572 (September 2013): 319–22. http://dx.doi.org/10.4028/www.scientific.net/kem.572.319.

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The instability flow in the control valve often lead to abnormal vibration, the valve wear and the valve stem destruction, also lead to pressure loss. The flow in the control valve show complex flow regime distribution and variation, it is a typical unsteady flow. Therefore, it is necessary to theoretical calculation and qualitative analyses the flow field of valve by the numerical simulation method. In this paper, we study on the axial force of valve stem that caused by the fluid pulsation pressure. Establishing the flow field model of the control valve, generating the computational grid through the pre-processor, using the CFD software to do discretized and solved, getting visualization graphics of the internal flow field. Study the changes of the flow characteristics according to different pressure ratio, getting the variation characteristic of axial force. Provide the basis for subsequent optimization and design of the low vibration control valve.

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31

YONEZAWA, Koichi, Tomofumi TAKINO, Nobuhiko SHIRAFUJI, Yoshinobu TSUJIMOTO, Takahide ENDO, and Kennichi TEZUKA. "J091014 An Investigation of Fluid Forces Acting on Valve Head of Steam Control Valve." Proceedings of Mechanical Engineering Congress, Japan 2011 (2011): _J091014–1—_J091014–5. http://dx.doi.org/10.1299/jsmemecj.2011._j091014-1.

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32

Goloshumova, V. N., and Yu M. Brodov. "Analysis of reliability of design of stop valve of steam turbin." Safety and Reliability of Power Industry 12, no. 3 (November 22, 2019): 206–12. http://dx.doi.org/10.24223/1999-5555-2019-12-3-206-212.

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The stop valve is one of the «critical» elements of the steam turbine installation, the heating conditions of which determine the reliability of the power unit as a whole. The stop valve for cogeneration steam turbines of subcritical parameters of "UTZ" is unified for familiesT-110/120-130, T-185/210-130/15, ПT-140/165-30/15, P-100-130/15. The sequence of analysis of the valve design is presented for conditions, where only the static temperature and steam pressure at the inlet to the valve, the steam flow rate at the outlet of it, the restrictions for movement during heating are known. The results of the analysis of calculations of unsteady gas-thermodynamic and stress-strain state of the valve during the heating of the main steam line of the turbine T-110/120-130 from the cold state according to the standard instructions are shown. The calculations were carried out by the finite element method using a three-dimensional geometric model of the valve body with a slit filter. The height of the holes in the slit filter is 3.5 mm. The equations of the Nusselt criterion for the flange, the steam box, the lower half of the steam box and the fairing when using computers with limited computing resources are presented. It is shown that the peak of the maximum stresses occurs at the initial stage of the stop valve warming up on the inner (heated) surface of the stop valve body in the area of the flange and the cover. The maximum equivalent stresses are 300 MPa. The comparison of calculated temperatures and temperatures measured during the start-up at the CHP is presented; the temperature difference does not exceed 5–6%. It is proposed to analyze the stop valve reliability with a sequence given in this article in the design of new stop valves with significant differences from the existing prototypes.

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33

Bresolin, C. S., P. S. Schneider, H. A. Vielmo, and F. H. R. França. "APPLICATION OF STEAM TURBINES SIMULATION MODELS IN POWER GENERATION SYSTEMS." Revista de Engenharia Térmica 5, no. 1 (July 31, 2006): 73. http://dx.doi.org/10.5380/reterm.v5i1.61675.

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The goal of this work is to simulate partial load operation of steam turbines indifferent controlling modes. An isentropic efficiency function is associated to aspecific steam turbine. The Schegliáiev and the Stodola's Ellipse Law, relatinglevels of pressure with mass flow, are compared. The proposed operational modes are: a) sliding pressure; b) throttling valve; c) nozzle valve. As a conclusion, Schegliáiev and Stodola's models leads to very similar results and the operational modes by valves establishes theoretical limits of operation for steam turbines. The sliding pressure control is more efficient considering design operation.

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34

Zhao, Hui, Ya Fei Wang, and Hong Jun Wang. "Research of Waste Heat Power Generation Main Steam Valve Control." Applied Mechanics and Materials 687-691 (November 2014): 487–91. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.487.

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In order to improve the stability of steam turbine under large disturbance, the controller of cement waste heat power generation valve was designed by using exponential terminal sliding mode variable structure control method. In this paper, taking a single machine infinite bus power system as an example, established mathematical model of waste heat generator valve system, and designed the valve controller of synchronous generator based on the exponential terminal sliding mode variable structure control theory. Then, valve control simulation model was set up and simulation experiment was performed by MATLAB. Finally, verify the effectiveness of the scheme by comparison analysis. Simulation results show that the controller can effectively improve the transient stability of power system and the dynamic quality.

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35

Wu, Zhen Yong, Xin Guo Ming, Wen Yan Song, Bao Ting Zhu, and Jia Min Ni. "Research on Large Steam Butterfly Valve for Steam Turbine DFMEA Tool System Based on Knowledge Management." Advanced Materials Research 291-294 (July 2011): 2961–64. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2961.

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Failure Modes and Effects Analysis (FMEA) method has been used to study the reliability of many different power generation systems, making it easier to take actions to overcome such issues, thus enhancing the reliability through design. A FMEA Knowledge Base System was designed and realized in this paper, and this system was used to design new steam butterfly valve for steam turbine. Through the system designer will improve product quality, and reduce risk.

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36

Al Hadabi, Ibrahim, Kyuro Sasaki, Yuichi Sugai, and Amin Yousefi-Sahzabi. "Steam trap control valve for enhancing steam flood performance in an Omani heterogeneous heavy oil field." Journal of Unconventional Oil and Gas Resources 16 (December 2016): 113–21. http://dx.doi.org/10.1016/j.juogr.2016.03.005.

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37

Zhang, Chao, Jin Sheng Zhang, and Zhi Wang. "Structure and Fluid Dynamic Characteristics Analysis of Enclosed Nuclear Electric Valve." Applied Mechanics and Materials 740 (March 2015): 131–35. http://dx.doi.org/10.4028/www.scientific.net/amm.740.131.

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The electric valve, cutting off or connecting pipeline of nuclear equipment, is an essential component of nuclear facilities for safe operation. The structure of self-developed enclosed nuclear electric valve is introduced in the paper firstly, and dynamics analysis of steam fluid in valve is carried out to tackle typical problems including leakage in the rapid open-close process of valve for high-temperature and high-pressure steam fluid. It can be determined that dynamic characteristic of steam fluid will directly affect force suffered by valve in the rapid open-close process, greatly influencing movement and ultimate position accuracy of valve gate.

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38

Tu, Shan, Shu Ming Wu, Qi Zhou, Hong Mei Zhang, and Xiao Qing Zhu. "Numerical Simulation of Flow in Imported Steam Turbine Inlet Components with Equilibrated Holes in High Performance." Advanced Materials Research 712-715 (June 2013): 1263–67. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1263.

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The main inlet component of steam turbine is control valve. The stable operation of the steam turbine control valve is vital for safe and stable operation of the steam turbine and safety production of the power plant. However, due to the complexity of the structure and unsteady characteristics of steam flow in the valve, there is not enough experimental method about the detailed flow characteristics of the area near control valve disc and the inside of the valve chamber up to now. This article is to focus on the simulation of the steam turbine control valve interior flow field which includes the valve pre-inlet channel in different conditions, then find the reasons which caused instability and pressure loss of the control valve by analyzing the flow field details, finally further optimization design. The profile matching of the valve disc and valve seat has a great influence on the interior flow field of control valve, so analysis of the high performance valve disc shape and divergence angle of valve seat is carried out, and the research conclusion is used for guide design and development of the control valve.

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39

TANG, Minjin, Shifang WU, and Ming KANG. "ICOPE-15-C079 A new overspeed calculation method of steam turbine under the condition of non-return valve failure or main valve leakage." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): _ICOPE—15——_ICOPE—15—. http://dx.doi.org/10.1299/jsmeicope.2015.12._icope-15-_161.

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40

Jiang, Nan, Xiangyong Chen, Ting Liu, Bin Liu, and Yuanwei Jing. "Nonlinear Steam Valve Adaptive Controller Design for the Power Systems." Intelligent Control and Automation 02, no. 01 (2011): 31–37. http://dx.doi.org/10.4236/ica.2011.21004.

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41

BOWDITCH, J. "The American High-Speed Single-Valve Automatic Cutoff Steam Engine." Transactions of the Newcomen Society 61, no. 1 (January 1989): 1–14. http://dx.doi.org/10.1179/tns.1989.001.

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42

MORITA, Ryo, Fumio INADA, Michitsugu MORI, Kenichi TEZUKA, and Yohinobu TSUJIMOTO. "A Study of Flow Oscillation on the Steam Control Valve." Proceedings of the JSME annual meeting 2003.7 (2003): 295–96. http://dx.doi.org/10.1299/jsmemecjo.2003.7.0_295.

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43

TOYOHIRA, Yosuke, Koichi YONEZAWA, Yoshinobu TSUJIMOTO, Kenichi TEZUKA, Michitsugu MORI, and Ryo MORITA. "1019 Flow oscillation and head vibration in steam control valve." Proceedings of Conference of Kansai Branch 2007.82 (2007): _10–19_. http://dx.doi.org/10.1299/jsmekansai.2007.82._10-19_.

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44

OGI, Kanako, Koichi YONEZAWA, Yoshinobu TSUJIMOTO, Takahide ENDO, and Kenichi TEZUKA. "1110 Research of Flow Induced Vibration in Steam Control Valve." Proceedings of Conference of Kansai Branch 2010.85 (2010): _11–10_. http://dx.doi.org/10.1299/jsmekansai.2010.85._11-10_.

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45

MORITA, Ryo, Fumio INADA, Michitsugu MORI, Kenichi TEZUKA, and Yohinobu TSUJIMOTO. "Numerical Approach of Flow Oscillation on the Steam Control Valve." Proceedings of The Computational Mechanics Conference 2003.16 (2003): 145–46. http://dx.doi.org/10.1299/jsmecmd.2003.16.145.

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46

MORITA, Ryo, Fumio INADA, Michitsugu MORI, Kenichi TEZUKA, and Yoshinobu TSUJIMOTO. "Suppression of the Flow Oscillation on the Steam Control Valve." Transactions of the Japan Society of Mechanical Engineers Series B 72, no. 715 (2006): 634–41. http://dx.doi.org/10.1299/kikaib.72.634.

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47

Duda, Piotr, and Renata Dwornicka. "Optimization of heating and cooling operations of steam gate valve." Structural and Multidisciplinary Optimization 40, no. 1-6 (March 14, 2009): 529–35. http://dx.doi.org/10.1007/s00158-009-0370-8.

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48

Schroeder, Craig J. "Metallurgical Failure Analysis of a Fractured Steam Control Valve Stem." Journal of Failure Analysis and Prevention 15, no. 3 (April 1, 2015): 370–78. http://dx.doi.org/10.1007/s11668-015-9957-0.

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49

Zhang, D., and A. Engeda. "Venturi valves for steam turbines and improved design considerations." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 2 (January 1, 2003): 219–30. http://dx.doi.org/10.1243/09576500360611254.

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As a turbine governing valve, the venturi valve has been widely used in large turbines to regulate inlet flow for about 40 years. It is favoured in terms of low total pressure loss because of the converging-diverging configurations of the valve passage. However, as turbines become larger and larger, a number of valve failure incidents have been reported, and there is a great demand for improved designs. Yet, because of the complicated nature of the fluid—structure interaction mechanisms, the basic mechanism causing valve vibration and failure is still far from being fully understood. Most of the available literature relies heavily on experiments before the 1980s. There are several improved designs by the trial and error method, but governing rules, or even a clear direction for improvement, are almost non-existent. There has still seen no published investigation using computational fluid dynamics (CFD) tools. As CFD is increasingly recognized as a powerful tool for understanding complicated fluid phenomena, a two-dimensional numerical investigation was performed in the present work. The study revealed that valve plug vibration is due to hydraulic forces acting on the plug at its balanced position and fluid-induced excitation as the plug vibrates in the lateral and vertical directions. All this relates to unexpected asymmetric flow patterns. By changing the plug shape, the flow patterns can be made much more symmetric, which reduces the intensity of steady forces and fluid plug interaction.

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50

Fan, Li Hua, and Guo Huang Cai. "Exploration on Aerodynamic Noise Characteristics for Control Valve of Steam Turbine." Applied Mechanics and Materials 224 (November 2012): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.224.395.

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Abstract:

The flow within the control valve is rather complicated, which is induced by a variety of pneumatic sound sources, including turbulent mixing, turbulence and boundary layer interaction, shock wave, etc. Through presenting the aerodynamic noise generation mechanism, we introduce several classic prediction methods for control valve of steam turbine, and then give the suppression and elimination advises of the aerodynamic noise of the control valve. It mainly involves two approaches, the direct method - sound source approach method and the indirect method–the acoustic path approachment method, and it can provide important guidance to control the noise level for steam turbine control valve.

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