基于熵产理论的翼端间隙空化涡流特性研究OACSTPCD

Taking the gap flow field at the side of a hydrofoil as the research object,a cavitation flow numerical simulation method validated by experiments was used to obtain flow field information under different gap widths.Based on the analysis of entropy production theory,it was found that the entropy production caused by turbulent dissipation accounts for the highest proportion of the total entropy production,exceeding 50％.Its variation with gap width is similar to the energy loss reflected by the total pressure difference,but entropy production can better reveal the details of energy loss in the flow field.Analyzing the characteristics of gap vortex and cavitation flow,it can be seen that turbulence dissipation is mainly concentrated in the outer edge of the vortex and the end region of cavitation,which is related to the rotation direction of the vortex and the stability of cavitation development.Under small gap widths,more attention should be paid to the energy loss near the hydrofoil.As the gap width increases,cavitation will affect the downstream flow field further away.Therefore,the impact of gap width needs to be comprehensively evaluated based on energy loss and flow characteristics.