Parametric analysis on throttling components of multi-stage high pressure reducing valve

Hou, Cong; Jin, Zhi Min; Chen, Fu qiang; Jiang, Wei kang

doi:10.1016/j.applthermaleng.2017.09.081

Cited by 40 publications

(13 citation statements)

References 23 publications

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“…The purpose of the work is to develop a scientifically based method for calculating the effective ranges of the design parameters of the throttle part of the axial valve. Currently, the design of equipment (Hou et al, 2017;Qiu et al, 2019) subject to the effect of cavitation, as a rule, is based on the active use of ready-made software products (Tang et al, 2019), and as a result, has a numerical representation of the results (Rudolf et al, 2017) of their application in graphical or tabular form. Visualization of the studied process (Qu et al, 2015), performed by this method, has a high degree of visibility for a particular device, however, this requires the preliminary implementation of labor-intensive experimental validation (Qu et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Regarding the methods for calculating the effective ranges of the design parameters of control valves, two approaches are most widespread: analytical estimation (Arzumanov, 1971(Arzumanov, , 1985Blagov, 1990) using the Pi-Buckingham theorem (Buckingham, 1915;Misic et al, 2010) or numerical modeling for gaseous (Bian et al, 2019a,b;Cao and Bian, 2019) and liquid (Qu et al, 2015;Hou et al, 2017;Rudolf et al, 2017;Qiu et al, 2019;Tang et al, 2019) environments using ready-made software products (Ansys Inc, 2013. Moreover, the first approach requires a wide experimental base, and the second requires a long adaptation of the software product to the main factors influencing the course of the studied processes, including cavitation (Knapp et al, 1970;Franc and Michel, 2005;Xu et al, 2015), in a specific design.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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The purpose of the work is to develop an analytical method for calculating the effective ranges of structural parameters of the throttle part of the axial valve with the external location of the locking shell based on the proposed stochastic models of bubble formation at the initial stage of hydrodynamic cavitation. In contrast to the well-known engineering methods for choosing the conditional bore diameter for the designed control device constructed using the Pi-Buckingham theorem, this calculation method relies not only on gyrodynamic similarity criteria, but also on functional dependences for the laws of distribution of cavitation bubbles according to various characteristics (specific size bubbles, the degree of opening of the node "separator-external locking shell"). This takes into account a wide range of design and operating parameters, including the required valve capacity, as well as the physical and mechanical characteristics of the working medium. A block diagram of the calculation of the node "separator-external locking shell" for the specified axial valve is proposed. The influence of a set of design parameters for the "separator-external locking shell" assembly from the rational ranges of their variation obtained using the proposed analytical calculation algorithm on the size of cavitation bubbles is investigated. It has been established that when using the latest results in comparison with the values of parameters from irrational ranges of change, there is a tendency to reduce the ensemble average value of the diameter of the cavitation bubble by 1.95 times, when switching to a mode from 20% of the degree of separation of the separator to 80% of the opening of the throttle holes, the nominal valve capacity increases by 10.7 times. The results obtained illustrate the possibility of preventing an increase in the intensity of formation of cavities in the flow part of the control device already at the initial stage of the occurrence of cavitation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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“…Analysis from flow field, the throttling components of high pressure reducing valve have great effects on the control performances. So the angle of throttling components, orifice plate thickness, plate number and diameter of plate holes in MSHPRV were studied [15]. But it is difficult to describe the thermodynamic characteristics of fluid flow through the pressure and velocity.…”

Section: Introductionmentioning

confidence: 99%

Evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve

Cao

Dong

et al. 2022

THERM SCI

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A well understanding on the evaporation characteristics and efficient working area of MSHPTRV (multi-stage high pressure and temperature reducing valve) is important for improving the performance and safety of MSHPTRV. The water spraying and evaporation model are integrated into the flow model of MSHPTRV. Compared with the experimental data, the model can show the thermal process well. The flow characteristics and interaction between steam and droplets are presented. On this basis, the increase rate of entropy Sdis is adopted to analyze the thermodynamic loss and innovatively determine the efficient working area of MSHPTRV. The results show that the pressure reducing effect of the second orifice plate is prominent, which accounts for 41.6% of the total pressure drop. The "steam-water layer" is formed at the boundary of steam and water. At the inlet of second orifice plate, the maximum Sdis is 0.782, and the downstream of second orifice plate is the efficient working area of MSHPTRV. The length of evaporation section increases with the droplets diameter significantly.

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“…Zhang et al [17] studied the control strategy of a hydraulic shaking table based on its structural flexibility. Qian and Wang et al [18,19] researched the effects of important elements, such as valves [20][21][22], pumps [23][24][25][26] and rotors [27], on stability. The influence of excitation forces on the vibration of a pump and measures of noise reduction were studied by Ye et al [28,29].…”

Section: Introductionmentioning

confidence: 99%

Absolute Stability Condition Derivation for Position Closed-Loop System in Hydraulic Automatic Gauge Control

et al. 2019

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In the metallurgical industry, hydraulic automatic gauge control (HAGC) is a core mechanism for thickness control of plates used in the rolling process. The stability of the HAGC system’s kernel position closed-loop is key to ensuring a process with high precision, speed and reliability. However, the closed-loop position control system is typically nonlinear, and its stability is affected by several factors, making it difficult to analyze instability in the system. This paper describes in detail the functioning of the position closed-loop system. A mathematical model of each component was established using theoretical analysis. An incremental transfer model of the position closed-loop system was also derived by studying the connections between each component. In addition, based on the derived information transfer relationship, a transfer block diagram of disturbance quantity of the system was established. Furthermore, the Popov frequency criterion method was introduced to ascertain its absolute stability. The results indicate that the absolute stability conditions of the position closed-loop system are derived in two situations: when spool displacement is positive or negative. This study lays a theoretical foundation for research on the instability mechanism of an HAGC system.

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Parametric analysis on throttling components of multi-stage high pressure reducing valve

Cited by 40 publications

References 23 publications

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve

Absolute Stability Condition Derivation for Position Closed-Loop System in Hydraulic Automatic Gauge Control

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