Investigation on failure process and structural optimization of a high pressure letdown valve

Zheng, Zhijian; Ou, Guofu; Ye, Haojie; Zhang, Lite; Wang, Chao; Jin, Haozhe; Shu, Geping

doi:10.1016/j.engfailanal.2016.04.023

Cited by 25 publications

(10 citation statements)

References 13 publications

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“…The throttling section with symmetric contraction and expansion used in the experiment is designed according to the actual structure of the pressurereducing valve studied by the research group. 19,21 The structure is also basically the same as that of the throttling section of the black water angle valve and liquid level control valve in our previous investigation, and the size is slightly different. [22][23][24] Although previous studies have systematically simulated the depressurized flow characteristics and cavitation erosion failure of the pressure-reducing valve, there is still a lack of specific experimental verification.…”

Section: Introductionmentioning

confidence: 74%

“…The throttling section with symmetric contraction and expansion used in the experiment is designed according to the actual structure of the pressure‐reducing valve studied by the research group 19,21 . The structure is also basically the same as that of the throttling section of the black water angle valve and liquid level control valve in our previous investigation, and the size is slightly different 22–24 .…”

Section: Introductionmentioning

confidence: 99%

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Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Duan

Wang

et al. 2022

Energy Science & Engineering

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For the phenomenon of widespread and serious cavitation damage in the throttling section of pressure reducing valve under high temperature and high pressure in the chemical technology process of petroleum and coal, according to actual coordination structure widely applied between the valve core and valve seat, the cavitation throttling section with symmetrical contraction and expansion was made, and the visualized cavitation water tunnel experimental apparatus was designed and constructed. The cavitation evolution process with time under different cavitation numbers σ was recorded by the highspeed photography, the variation law of cavitation damage length and area with time was investigated by using aluminum film as cavitation damage carrier. Based on the experimental cavitation characteristic length L*, the evaporation coefficient F v , and condensation coefficient F c in the Zwart-Gerber-Belamri cavitation numerical model were modified, and the cavitation damage region was predicted by the gas phase condensation rate of numerical simulation. The results show that with the decrease of cavitation number, the characteristic length of cavitation strip increases; the cavitation characteristic length fluctuates greatly at σ = 1.22, and there are cavitation cloud periodic formation, shedding, collapse, and disappearance at the tail of the cavitation strip on the upper valve seat; the cavitation damage length of the upper and lower valve seat remains unchanged with time, and the cavitation damage area increases approximately linearly with time; the initial position and length of cavitation damage predicted by the gas phase condensation rate are basically consistent with the experimental results, which verifies the accuracy of the modified numerical simulation.

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Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Duan

Wang

et al. 2022

Energy Science & Engineering

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“…Dimensionless parameters L/R 0 is used to present the effect of the structural optimization design of the valve spool on the unsteady cavitation flow field, where L is the length of the circular section and R 0 is the radius of the circular section of the valve spool head. Zhang et al [23,24] already reported that decreasing the radius of the spool head reduces the intensities of erosion-cavitation wear. So we only focus on the parameter the length of the circular section L.…”

Section: Influence Of the Length/diameter Ratio On Unsteady Cavitation Flowmentioning

confidence: 99%

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

Liu

et al. 2021

Shock and Vibration

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A combined numerical-experiment investigation on the unsteady cavitation flow and pressure fluctuation characteristics in the regulating valves is conducted in this paper. The cavitation flow in the regulating valve is an unsteady and periodic flow which could be divided into fixed and travelling cavitation bubbles. The fixed cavitation bubbles are formed in the gap in the initial stage and then fell off and formed the travelling cavitation bubbles because of the re-entrant jet. The travelling cavitation bubbles move downstream, oscillate, and break up into several smaller bubbles. Changes in the length/radius ratio (L/R0) of the valve spool is an important factor affecting unsteady cavitation flow and pressure pulsation characteristics in the regulating valve. The length of travelling cavitation bubbles increases firstly and then decreases with increasing time. With the increase of the length/radius ratio (L/R0), the oscillation period of cavitation bubbles also increases. In the initial stage of cavitation bubbles, the velocity distribution inside the regulating valve is relatively stable, and no re-entrant jet could be found although L/R0 is different. In the collapse stage of cavitation bubbles, the velocity distribution becomes extremely unstable because the collapsing cavitation bubbles affect the pressure drop and velocity field in the flow channel. Furthermore, the amplitude of pressure pulsation increases gradually, and the peak time of the pressure pulsation is gradually delayed while increasing the length/diameter ratio.

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“…In industrial environments, CFD simulations have been used to analyze the flow effects in different types of equipment and components, including tubes, [16] pumps, [17] turbines, [18] bearings, [19] valves, [20] and cooling towers. [21] The determination of the air movement around a structure, topographic, and atmospheric features, as well as constituent materials and building geometry, is not currently accounted for in conventional estimation processes but can be considered when using CFD simulations.…”

Section: General Cfd Overviewmentioning

confidence: 99%

“…In bioengineering, researchers use CFD simulations to simulate flow in human blood vessels, exploring issues, such as cardiovascular flows and tensions, drug distribution throughout the body, and response speeds from inhalers and other respiratory devices. In industrial environments, CFD simulations have been used to analyze the flow effects in different types of equipment and components, including tubes, pumps, turbines, bearings, valves, and cooling towers …”

Section: Introductionmentioning

confidence: 99%

Using computational fluid dynamics to improve the drag coefficient estimates for tall buildings under wind loading

Wahrhaftig

Silva

2017

Structural Design Tall Build

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Summary Wind is the main horizontal force acting on tall buildings. This force is proportional to the drag coefficient. The drag coefficient is an important factor in their structural design. Designers have historically relied upon experimental wind tunnel results to estimate the drag coefficient. However, this process is both expensive and time consuming. In this study, we alternatively computed the drag coefficient (apart from the pressure, force, and bending moment) using computational fluid dynamics for a typical 93‐m‐high residential building. The simulation considers the actual building geometry, as well as the neighborhood roughness effects. We compared these results with the conventional estimates contained in the Brazilian code NBR‐6123/1988 and Eurocode EC1. The results indicated that the pressures obtained herein near the top of the building were lower compared to those obtained using conventional estimation methods given in codes. Comparatively, the obtained bending moment relative to the base of the building was higher, indicating the existence of significant drag forces not considered in codes. In fluid dynamics simulations, the drag coefficient is determined for each terrain condition. Computational fluid dynamics can effectively simulate the drag force and resultant forces in the direction of the flow, as well as the vortices that result during coating detachment and other types of damage.

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Investigation on failure process and structural optimization of a high pressure letdown valve

Cited by 25 publications

References 13 publications

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

Using computational fluid dynamics to improve the drag coefficient estimates for tall buildings under wind loading

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