Numerical analysis of surface piercing propeller cup section's water exit and entry
To analyze the mechanism of a surface piercing propeller cup section's water exit and entry,the cup sec-tion of the 841-B surface piercing propeller was modeled,and a reliable numerical method was established by sol-ving the RANS equation to simulate the water entry process of the cup section by combining the standard k-ε turbu-lence model,VOF method,and overlapping grid technique.On this basis,the mechanism of the section's water exit and entry was studied,and the free liquid surface form,ventilation cavity,flow field form,and mechanical characteristics of the cup section under different advance coefficients were analyzed.The results showed that the water exit and entry process of the cup section was unsteady,with strong nonlinear change of the free liquid sur-face.During water entry,the pressure dropped and inhaled air to form a ventilation cavity.When the next section entered water,the liquid surface was more affected.Increasing the advance coefficient inhibited this ventilation phenomenon.In addition,the change in the ventilation cavity affected the mechanical characteristics of the surface piercing propeller.
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