Numerical simulation study of turbulent flow field in 90° bend pipe
The turbulent flow field in 90° bend pipe is studied based on numerical simulation.The results show that tangential velocity increases and pressure decreases from 0° to 60°,while tangential velocity decreases and pressure increases when the degree is from 60° to 90° near inner wall.On the contrary,the tangential velocity decreases and pressure increases from 0° to 60°,but tangential velocity increases and pressure decreases from 60° to 90° near outer wall.Within bend part,centrifugal force from fluid swirling results in the radial pressure.And the axial velocity and radial velocity induced,which results in the secondary flow.The flow field in 90° bend pipe contains the mainstream and secondary flow,and is impressed by a complicated three-dimensional flow behavior.