Numerical calculation analysis on hydraulic characteristic of double-bend elbow
In order to explore the hydraulic characteristics of double-bend elbows under different included angles,flow channel structures and Reynolds numbers,and to reveal the correlation between different included angles,flow channel structures,Reynolds numbers,and local head loss.DN192 mm was used as an example,Three-dimensional structure models of four different angles of runners,including bending-bending,bending-fold,fold-bending,and fold-fold were established.Calculation and post-processing by numerical simulation,the different angles of DN192 mm double-bend elbows,Flow channel structure,hydraulic properties at Reynolds number and flow field distribution.The results show that the local resistance coefficient and the included angle of the DN192 mm double-bend elbow mainly show a quadratic parabolic relationship,and with the increase of the bending angle,it first decreases and then increases.When the included angle of all combined elbows is π/6,the local resistance loss coefficient reached the minimum;Under the same conditions,the bending-bending combined pipe structure is the best,the bending-fold combination and the fold-bending combination are better,and the fold-fold combination is the worst;In the design of double-bend combined elbow,the angle between the inflow direction and the transition section should be about π/6.
万方数据
维普
