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Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

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Abstract

The link rod butterfly valve, which uses a four-bar linkage mechanism to drive the valve plate, is a promising candidate for treating high-temperature steam and industrial exhaust because of its reliable sealing property. In this paper, the 3D flow field in the link rod butterfly valve for high-temperature steam was simulated using computational fluid dynamics. The flow coefficient of the valve, the velocity field, the temperature distribution and the enthalpy change in the steam under different valve openings were studied. The results showed that the flow coefficient of the link rod butterfly valve increased with an accelerated slope as the rotation angle of the valve stem was enlarged over 60°. The velocity and the vorticity of the steam were dramatically increased near the valve. The steam branches were accelerated up to 15 times the inlet flow velocity when they passed through the gaps between the valve plate and the valve body, and the vorticity was as large as 76/s. The temperature of the steam passing through the valve was decreased by 50–108 K for different openings. The temperature difference in the steam on the valve plate was as high as 400 K, which makes a challenge for the material of the valve plate. Larger enthalpy drop of the steam was resulted in when the valve was working at the throttling state than fully opened. Local peaks for the enthalpy drop were observed as the valve stem was rotated by 30° and 60°, and the local valley was at about 50°. The present study may serve as a useful reference for the design of link rod butterfly valves.

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Abbreviations

\(c_{\text{p}}\) :

Heat capacity at constant pressure

C V :

Flow coefficient

d :

Translational distance of the valve plate

E :

Energy per unit mass

\(F_{i}\) :

Gravity

G :

Specific gravity of the steam

h :

Surface heat transfer coefficient

\(\Delta H\) :

Enthalpy drop of the steam

\(j_{{j^{{\prime }} }}\) :

Diffuse stream component

k :

Thermal diffusivity

\(k_{\text{eff}}\) :

Effective thermal conductivity

l 1 :

Distance from the valve plate to the valve body

l 2 :

Distance from the valve plate to the valve seat

N :

Number of grids for meshing

P :

Pressure of the steam

\(\Delta P_{\text{v}}\) :

Differential pressure before and after the valve

\(q_{v}\) :

Internal heat source strength

\(q_{m}\) :

Outlet flow rate

Q :

Flow rate of valve

\(S_{h}\) :

Power of work by the viscous stress on the steam per unit volume

t :

Time

\(T_{b}\) :

Average temperature at the outlet

\(T_{\text{s}}\) :

Steam temperature

\(\overline{T}_{\text{s}}\) :

Cross-sectional mean temperature

\(T_{\text{w}}\) :

Wall temperature

u :

Velocity of the flow field

\(\bar{v}\) :

Cross-sectional mean velocity

\(\bar{v}_{\text{g}}\) :

Average velocity of the steam flowing through gap

Z :

Coordinate along the pipe

α :

Rotation angle of valve stem

γ :

Opening rate

θ :

Rotation angle of the valve plate

λ :

Thermal conductivity

ρ :

Steam density

\(\tau_{ij}\) :

Stress tensor

Ω:

Vorticity

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Acknowledgements

This work was supported by the National Natural Science Foundation of China, Grant No. (51105046), and Qing Lan Project of Jiangsu Province, China. The authors thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of the manuscript.

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  1. School of Mechanical Engineering, Changzhou University, Changzhou, 213164, People’s Republic of China

    Biao Kan & Lijuan Chen

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  1. Biao Kan
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  2. Lijuan Chen
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Correspondence to Biao Kan.

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Kan, B., Chen, L. Numerical analysis of flow field in link rod butterfly valve for high-temperature steam. J Braz. Soc. Mech. Sci. Eng. 42, 202 (2020). https://doi.org/10.1007/s40430-020-02294-6

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