[2021-Vol.18-Issue 5]A Study on Aerodynamic Performance of Different Bionic-Structured Surfaces via Belt Grinding
Post: 2021-11-25 13:06  View:556

Journal of Bionic Engineering (2021) 18:1179–1191 

A Study on Aerodynamic Performance of Diferent Bionic-Structured Surfaces via Belt Grinding 

Guijian Xiao1,2 · Yi He1,2 · Kun Zhou1,2 · Shengwang Zhu1,2 · Shayu Song1,2 · Kangkang Song1,2 

1 College of Mechanical and Vehicle Engineering, Chongqing University, Shazhengjie Chongqing 400044, China 

2 The State Key Laboratory of Mechanical Transmissions, Chongqing University, Shazhengjie Chongqing 400044, China

Abstract The structural characteristics of the surfaces of sharkskin have great infuence on their aerodynamic performance. It has been proved that the sharkskin’s ribbed structure can improve the aerodynamic performance of the parts up to 10%. At present, the main processing methods for this structure are laser, rolling, etc., which have low efciency and poor surface integrity. Belt grinding is widely used in the surface grinding and polishing. It plays an important role in improving the surface integrity and can realize the micro-structure machining at the same time. To achieve drag reduction, based on the characteristics of drag reduction of Bionic-Ribbed Structures (BRS), diferent BRS (V, trapezoid and wave) on a blade were processed and studied. First, this paper introduces the theory of drag reduction induced by BRS and processing methods of diferent BRS on a blade by belt grinding, and carried out the verifcation of the belt-grinding methods. Then, diferent BRS models were established on the blade with diferent tip angles, and the aerodynamic performance was analyzed through simulation. It was found that the low-velocity layer near the BRS decreased when tip angle increased. Its wall shear stress also increased and tip angle of 45? had the best performance regardless of which BRS was. Some suggestions were given for belt grinding. The velocity along height from valley of BRS and velocity streamline was demonstrated. Secondary vortex was observed. Velocity gradient and vortex were the main reasons for the diference of wall shear stress. 

Keywords Belt grinding · Bionic-ribbed structures · Secondary vortex · BRS · Wall shear stress

Fig. 7

Grinding method for different BRS. a Grinding method for V-BRS; b grinding method for trapezoid –BRS; c grinding method for wave –BRS

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