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    Home > Active Ingredient News > Drugs Articles > Calculation and improvement of internal flow field of large diameter butterfly valve

    Calculation and improvement of internal flow field of large diameter butterfly valve

    • Last Update: 2014-10-30
    • Source: Internet
    • Author: User
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    For the butterfly valve in large-scale water transmission project, its main characteristics are large caliber and large flow In order to reduce the energy loss and improve the efficiency of water delivery, it is necessary to reduce the pressure loss of butterfly valve and increase the flow coefficient 1 Calculation Model 1.1 geometric modeling: firstly, the three-dimensional modeling of the butterfly plate is carried out with Solidworks software (see Figure 1) The bottom diameter of butterfly plate is 3.4m The upper part of the butterfly plate is designed as an arch structure, and a number of grilles are designed inside the arch to improve the water flow area There is a boss on both sides of the arch to install the rotating shaft of the butterfly plate According to the preliminary analysis of the three-dimensional modeling of the prototype butterfly plate in Figure 1, the bosses on both sides of the arch shape may cause flow disorder, so it is transformed into a streamline shape, and its three-dimensional modeling is shown in Figure 2 Fig 2 3-D modeling of improved butterfly plate 1.2 calculation modeling calculation model adopts 3-D N-S equation and standard k - ε turbulence model The main governing equations are: in formula (1), q is the conservative variable vector; F, G, h are the fluxes in three coordinate directions respectively, which are expressed as formula (2) - formula (5), in which the stress term is formula (6) on page 2 The standard k - ε model is used for solution, and the specific equation is shown in formula (7) and formula (8) on page 2 In formula (7) and formula (8), G K is turbulent kinetic energy, ε is turbulent energy dissipation rate, σ K and σ ε are Prandtl numbers of K and ε, respectively, (6) (7) (8) (9), where S is modulus of mean strain rate tensor, μ t is turbulent viscosity, (10) The constants in the model are as follows: C 1 ε = 1.44, C 2 ε = 1.92, C μ = 0.09, σ k = 1.0, σ ε = 1.3 (11) Calculation conditions: flow inlet speed 5m / s, inlet pressure 100KPA 2 Calculation results and analysis: according to the inlet flow velocity of 5m / s and inlet pressure of 100KPA in front of the valve, the dynamic grid technology is used to obtain the flow field changes in the dynamic process of the butterfly plate (see Figure 3) Fig 3 Calculation of flow regime change during valve opening also shows flow streamline diagram and pressure nephogram of two butterfly plates under horizontal (i.e fully open) state before and after improvement (see Fig 4 and Fig 5, FIG 6 and Fig 7 on page 3) It can be seen from the streamline diagram that the flow near the butterfly plate of the prototype valve is more disordered, while the flow after improvement is more smooth It can be seen from the pressure nephogram that the pressure gradient before and after the improvement is obviously different The original butterfly plate has obvious pressure concentration on both sides of the boss and the outer rib plate, which is easy to cause structural damage, while the pressure distribution of the improved butterfly plate is relatively uniform Fig 4 flow line (velocity) of prototype butterfly plate Fig 5 flow line (velocity) of improved butterfly plate Fig 6 pressure cloud (gauge pressure) of prototype butterfly plate Fig 7 pressure cloud (gauge pressure) of improved butterfly plate from the calculation results, the improved butterfly plate has the obvious advantages of "large flow coefficient and small pressure loss" More practical data are flow coefficient and pressure loss coefficient The calculation in this paper also gives the relevant results before and after the improvement (see Table 1) Table 1 pressure coefficient and flow coefficient before and after the improvement of the butterfly plate From the calculation results in Table 1, it can be seen that the resistance of the improved butterfly plate is reduced by about 30%, the pressure difference is reduced by 9%, the pressure loss coefficient is reduced by about 9%, and the flow coefficient is increased by 5% 3 Economic analysis: the valve plate of the butterfly valve is formed by casting process After the improvement, the material cost increased by about 5%, the processing technology did not change much, and the total manufacturing cost increased slightly However, the stress concentration of the joint parts of the improved valve has been greatly improved due to the streamlined two-sided boss, which is not easy to be damaged under the condition of large load, so that the failure rate of the valve is significantly reduced, and the service life is significantly prolonged; moreover, the energy loss in the water delivery process is reduced, and the working efficiency is improved In comparison, the increase of manufacturing cost can be ignored Product search product catalog ball valve series vq347h worm gear V-type regulating ball valve direct buried release all welded ball valve can be pre insulated all welded steel direct buried ball valve full bore steel 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