presented a theoretical model to predict the pressure loss in cross-flow compact heat transfer with circular mini channels, but this model cannot be used to predict pressure loss in curved flow channels. Zhang et al., based on the dimensionless analysis method, deduced the pressure calculation formula of a 90° elbow, but it is not yet practically applicable. adopted a smooth transition design for a 90° sharp elbow in a traditional hydraulic valve, and the redesigned pressure loss was reduced by 50%. used CFD analysis to study the pressure loss in a 90° elbow and V-joint in traditional hydraulic manifolds and concluded that CFD simulation can predict the correct trend of pressure loss, but their results overestimated the experimental results. This model can be used to quickly predict the pressure loss in curved flow channels in the aviation hydraulic field.Īt present, some scholars have carried out preliminary research on the pressure loss at the elbow in traditional channels. The pressure loss in the flow channel samples fabricated using selective laser melting was tested, and the results showed that the average error between the test results and the mathematical model calculation results was 7.72%. According to the multiple regression analysis method, the mathematical model of pressure loss in aviation hydraulic channels was developed, and the model was solved based on the orthogonal experimental results. Using computational fluid dynamics simulation, the relationships between the flow channel diameter, the flow channel length, the flow channel curvature radius, the fluid velocity and pressure loss were studied. In this paper, the pressure loss in a curved flow channel was firstly studied, and the main parameters affecting the pressure loss were determined using the dimensionless analysis method. At present, most studies only focus on how much the pressure loss in an additive manufacturing (AM) hydraulic channel is reduced compared with an original hydraulic channel, and a mathematical model of pressure loss in an AM curved channel is still lacking. Pressure loss in hydraulic valve internal flow channels is a primary factor that designers need to consider, and the rapid prediction of pressure loss is very helpful for flow channel design. The application of additive manufacturing in the field of aviation hydraulics greatly improves the design freedom of hydraulic valve internal flow channels.
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