Analysis of Flow Characteristics of a Primary Regulator in a Pressure Regulating System
In order to study the indirect action gas regulator system in a regulator regulator performance,using standard k-ε turbulence model,combined with dynamic mesh technology for numerical simulation,to study the flow characteristics under different inlet pressures and the internal flow field with the change rule of the opening degree.The results show that under different inlet pressures,with the increase of opening degree,the driving pressure and flow resistance coefficient first decreases sharply and then gradually remain stable,the mass flow rate and flow coefficient shows a parabolic increase,the flow characteristics of the curve is not much difference between the curves.The primary regulator has better flow characteristics,and the effect of energy dissipation and pressure reduction is significant at small openings.In four openings,there is a large pressure and flow rate gradient at the valve opening,the gas passes through both sides of the valve opening to form a high-speed convective jet,which converges at the centre of the valve opening and then jets out downstream.The convective jet and return flow interact with each other near the wall of the spool to produce turbulent vortices,forming a low-pressure area near the wall of the spool.As the opening increases,the minimum pressure and turbulent vortex region in the internal flow field decreases,and the flow velocity at the valve opening and the downstream extension of the convective jet increases.The results of the study can provide a reference for the operation and structure optimisation of this type of regulator.
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