Parametric design of bionic airfoil and its application
The hydrofoil,which was the fundamental section structure in the field of fluid machinery,was widely utilized in various sectors such as aerospace,petrochemical,and underwater machinery.However,there had been a scarcity of research on bionic hydrofoils based on hydrodynamics within the domain of hydraulic machinery.This paper took the sturgeon as the subject of study and conducted a bionic design inspired by it,proposed a piece-wise non-uniform B-spline fitting method that incorporated local control points.With the assistance of large eddy simulation methods,simulated the lift-drag characteristics of the hydrofoil and the velocity distribution around its wing.The results indicated that the local encryption method for control points,which was adopted while ensuring the fitting error of the bionic hydrofoil,could significantly reduce the number of control points required.It was observed that an increase in the curve fitting error led to changes in the fluid's velocity distribution around the hydrofoil.In turn,enlarged the unstable vortex area near the wall close to the trailing edge of the hydrofoil,causing a decrease in the lift-drag ratio.When the bionic hydrofoil was implemented in a jet pump,it was discovered that the impeller designed using this bionic hydrofoil outperformed the traditional NACA0015 hydrofoil in terms of pump lift and efficiency under the specified design conditions.Furthermore,when considering the curve fitting error,it was noted that a higher curve fitting error corresponded to lower pump efficiency.
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