Effect of Multi Jets on Cavitation Performance of Globe Valves

Rammohan, S.; Saseendran, S.; Kumaraswamy, S.

doi:10.1299/jfst.4.128

Cited by 4 publications

(3 citation statements)

References 9 publications

(8 reference statements)

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“…A frequently used noise reduction method is the installation of a noise reduction valve cage with holes drilled in the cage, which can only satisfy the linear flow characteristics due to the uniform distribution of the holes [21,22]. Sotoodeh [23] investigated valve cages with many small holes drilled in the control valve to divide the flow into many small flows, using this design to reduce noise.…”

Section: Introductionmentioning

confidence: 99%

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

2022

Journal of Chemistry

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For all kinds of media noise, noise reduction valve cage cannot meet the equal percentage flow characteristics, and for manufacturing and processing and other technical problems, research and design of new noise reduction two-stage cage control valve are necessary. The valve adopts noise reduction valve cage and curve valve cage with noise reduction, forming a two-stage noise reduction, with uniform flow, diffusion, and noise reduction effect, to meet the regulating valve equal percentage flow characteristics. The spool is evenly stressed and not easy to loosen and fall off, and the small opening is not easy to vibrate and shake. The flow characteristics of the noise-reducing two-stage cage control valve are studied, and the fluid flow coefficients, flow characteristic curves, the relationship of flow coefficients with nominal diameter at the same stroke, and the relationship of flow coefficients with different nominal diameters at different strokes are analyzed. The relationship between nominal diameter constant opening and cavitation coefficient with inlet velocity, the relationship between inlet velocity and cavitation coefficient with nominal diameter at half opening, and the relationship between inlet velocity and cavitation coefficient with nominal diameter at full opening were studied, and the cavitation generation and its effect on noise were analyzed. The noise and cavitation test showed that noise is very small and cavitation is difficult to produce, all meeting the noise reduction requirements.

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Section: Introductionmentioning

confidence: 99%

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

2022

Journal of Chemistry

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“…Yu et al [10] studied the influence of the sleeve structure on the throttle characteristics of the valve. Rammohan et al [11] investigated the effect of the sleeve structure of a valve on its cavitation performance. Tang et al [12,13] examined the flow characteristics of valves.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics Study of High-Parameter Multi-Stage Sleeve Control Valve

Sun,

Wu,

et al. 2022

Processes

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This study considers a multi-stage sleeve control valve with different opening degrees. The flow capacity of the numerical model is calculated using the actual working conditions of the control valve in a nuclear power plant as a baseline. A flow resistance test bench is then used to measure the flow capacity under each opening degree, and the flow characteristic curve is plotted to verify the accuracy of the numerical model. Based on CFX software simulations of different opening speeds, pressures, turbulent kinetic energy clouds, and set detection curves, analysis of the flow characteristics of the multi-stage sleeve valve with high parameters shows that, with an increase in the degree of opening, the valve speed will also increase. However, the speed at the socket orifice is slightly different, exhibiting a higher opening in the middle and lower openings on both sides. A maximum speed of 792.4 m/s is found in the 40% valve orifice. A maximum value of the turbulent kinetic energy of 1.4 × 10 4m2/s2 occurs in the throttle hole of the valve seat with an opening of 80%. The source of the aerodynamic noise is obtained in this study, which is of great significance to the decompression and noise reduction in multi-stage sleeve valves.

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“…Control valves and pumps are vital components in industrial applications. The useful life of industrial valves and pumps are highly affected by the phenomenon of bubble collapse [21,22]. In [23], the authors investigate the effect of the number of trims on the performance of the globe valve and how it suppresses the cavitation problem.…”

Section: Introductionmentioning

confidence: 99%

Utilizing sliding mode control for the cavitation phenomenon and using the obtaining result in modern medicine

Badfar

Ardestani

2019

SN Appl. Sci.

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The existence of a bubble in the vicinity of an elastic boundary appears in many situations such as medical and mechanical systems. On the other hand, bubble collapse is considered a source of energy loss in most systems and caused a lot of damages to it. This research is the first attempt to prevent bubble collapse in the vicinity of an elastic boundary by using control algorithms. In this paper, first, the nonlinear dynamic model of bubble in the vicinity of an elastic wall is introduced and then rewritten into state-space form. The second part of this paper is devoted to the design of the sliding mode controller for the bubble system, where the ultrasonic pressure plays the role of control input and the output is the bubble radius. Our main objective is to design a stabilizing controller that is able to regulate the radius of the bubble to the desired radius. At first, traditional sliding mode controller is proposed. Despite the successful tracking error, the chattering problem of this method leads us to introduce the boundary layer sliding mode control. Although the chattering phenomenon has been attenuated, it increases the steady-state error. Finally, robust integral sliding mode control is suggested to minimize the steady-state error while the chattering problem is removed. Numerical simulations including the case of parametric uncertainty are also presented. The results of this study are of immediate interest for medical applications such as ultrasound imaging and also industrial applications such as designing long-lasting pumps and valves.

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Effect of Multi Jets on Cavitation Performance of Globe Valves

Cited by 4 publications

References 9 publications

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

Flow Characteristics Study of High-Parameter Multi-Stage Sleeve Control Valve

Utilizing sliding mode control for the cavitation phenomenon and using the obtaining result in modern medicine

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