Research on flow field simulation and numerical analysis of pneumatic transmission elbow based on ANSYS

As an important part of the pipeline, the structure and material of the elbow greatly affect the service life of the pipeline. By analyzing the flow field of a bend with a certain bending length under different pipe diameters and different bending angles, the changes of pressure and velocity between the inlet and the outlet are studied. The Bernoulli equation is used to predict the relationship between the pressure loss and the velocity change at the outlet of the elbow, and the pressure loss at the outlet is calculated theoretically. Fluent is used to simulate and numerically calculate the pressure and velocity distribution of the elbow. The results show that: when the pipe diameter is constant, the smaller the bending angle, the smaller the pressure loss at the outlet of the elbow; under the same bending angle, the pressure loss decreases with the increase of the pipe diameter; when the pressure loss increases with the increase of the angle, the velocity increase is relatively large for a pipe with a bend angle of 90°.