Analysis of flow characteristics in bellows with different characteristics
As a kind of pipe connection device,bellows are widely used in the transportation and flow control of liquid,gas and other media in various fields.In order to explore the distribution characteristics of the flow field inside the bellows with different characteristics,the numerical calculation conditions of the inlet mass flow rate(5.83 kg/s)and the free flow were adopted,and the turbulent kinetic energy k and turbulent dissipation rate ε were numerically simulated based on ANSYS CFX.The flow characteristics and pressure field distribution of bellows with different curvature,nodule number and size were revealed,and the head loss under corresponding working conditions was calculated.The results showed that:(1)the curvature,nodal number and size of the bellows had great influence on the internal flow field and the resulting head loss;(2)The static pressure and flow velocity distribution trend of the fluid domain inside the bellows with different bending degrees were the same as a whole.From the inlet to the outlet,the static pressure and flow velocity of the fluid inside the bellows gradually decreased.With the increase of curvature,the static pressure of fluid at the inlet end gradually increased,and the static pressure of fluid at the outlet end gradually decreased.The flow velocity of fluid at the edge of the corrugated pipe with different curvature was small,while the flow velocity of fluid at the middle part was large,and gradually decreased to both sides.(3)When the bend of the bellows was 180°,with the increase of the number of nodes,the change trend of static pressure in the fluid domain inside the bellows was the same as a whole,and the average maximum velocity in the bellows showed an increasing trend;(4)When the bend of the bellows was 180° and the number of nodes was 25,the static pressure and flow velocity of the fluid in the bellows gradually increased with the gradual reduction of the overall bellows,and the static pressure and flow velocity of the fluid in the X-Y section remained unchanged as a whole;(5)The head loss generated by the flow field in the bellows was positively correlated with the curvature of the bellows and the number of nodes,and negatively correlated with the size.The results of this study can provide reference for the optimization design and improvement of bellows,and provide reasonable suggestions in the installation and use of bellows.
bellowsflow characteristicflow ratestatic pressurehead loss
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