Numerical Simulation of Flow Field in Orifice of Hydraulic Cone Control Valve for Drilling Fluids

Power-law rheological model and RNG k-e turbulence model were used to simulate the flow field in hydraulic poppet valve for drilling fluids,which are based on computational fluid dynamics approach.The effect of angle of poppet,arc in front of poppet and chamfer of valve seat in the flow field within cone valve was investigated emphatically by analyzing the form of stream line,the data and distribution of pressure and velocity.Results show:(1) With the increasing of poppet's angle,the pressure will decrease at first,then increase,at the junction of cone and cylinder of the valve.(2) The arc at the junction of cone and cylinder of the valve will help to improve the situation of the pressure.However,when the radius of the arc is increased to a certain extent,the pressure will not change significantly.(3) when valve seat is chamfered,energy loss will decline in the Flow Field,the pressure in orifice will decrease too,and the longer length of the chamfer,the lower the pressure will be.