摘要
针对V型球阀应用在流体介质中含有固体颗粒、纤维等工况场合问题,以DN50的V型球阀为研究对象,通过FLUENT软件对3种不同开度的V型球阀内固液两相流场进行分析,运用DPM离散相模型,液相视为连续介质,固相颗粒设置为离散介质,在拉格朗日坐标系下求解颗粒运动方程,采用迭代计算方法实现固液两相耦合。通过模拟得到V型球阀内液固两相流场特性,得到颗粒的运动轨迹图和冲蚀磨损分布规律。结果表明:在转动角度30°和50°时,阀内负压明显大于80°时,从-56.358 kPa降至-9.553 kPa;随着开度增大,阀内最高流速由55.959 m/s^(2)降至4.865 m/s^(2),阀内流速逐渐局域平缓;冲蚀速率也随着开度增大而下降,从1.22×10^(-3)kg/(m^(2)·s)下降到3.02×10^(-3)kg/(m^(2)·s),这是因为开度增大,流速趋于平缓,减小了颗粒与壁面的碰撞,抑制了阀门的冲蚀破坏现象。
For the application of the V-shaped ball valve in the fluid medium containing solid particles,fibers and other working conditions,a DN50 V-shaped ball valve was used as the research object,and the solid-liquid two-phase flow field in the V-shaped ball valve with the three different openings was analyzed through the Fluent software.By using the DPM discrete phase model,considering the liquid phase as a continuous medium,and setting the solid phase particles as a discrete medium,the particle motion equation was solved in the Lagrangian coordinate system,and an iterative calculation method was used to realize the solid-liquid two-phase coupling.Through simulation,the characteristics of the liquid-solid two-phase flow field in the V-shaped ball valve were obtained,and the particle trajectory diagram and the erosion and wear distribution law were obtained.The results show that when the rotation angle is 30° and 50°,the negative pressure in the valve is obviously greater than that at 80°,decreasing from-56.358 kPa to-9.553 kPa;as the opening increases,the maximum flow velocity in the valve decreases from 55.959 m/s^(2)to4.865 m/s^(2),and the flow velocity in the valve is gradually localized and gentle;the erosion rate also decreases with the increase of opening from 1.22×10^(-3)kg/(m^(2)·s) to 3.02×10^(-3)kg/(m^(2)·s),this is because as the opening increases,the flow velocity tends to be gentle,thus reducing collision between the particles and the wall surface,and suppressing the erosion damage of the valve.
作者
王佳琪
何世权
李力
刘帅帅
WANG Jiaqi;HE Shiquan;LI Li;LIU Shuaishuai(Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing 211816,China)
出处
《流体机械》
CSCD
北大核心
2021年第11期81-85,共5页
Fluid Machinery
基金
江苏省研究生实践创新计划项目(SJCX21_0524)。
关键词
V型球阀
DPM
冲蚀
固液两相流
数值模拟
V-shaped ball valve
DPM
erosion
solid-liquid two-phase flow
numerical simulation
