近地鱼形钝体气动阻力特性研究

Aerodynamic Drag Characteristics of a NearGround FishShaped Bluff Body

摘要:

采用数值模拟与风洞试验两种方法，研究以粒突箱鲀为仿生原型的近地鱼形钝体气动阻力特性.结果表明，近地鱼形钝体确为气动低阻形体，其尾部大收缩角的形态特征及尾迹区相对简单的流场结构共同决定了该形体的气动低阻特性；从气动阻力系数、表面压力系数及尾迹区流场结构三方面对比分析，SST湍流模型的预测值与试验值较为接近.

Abstract:

By using wind tunnel test and numerical simulation, the aerodynamic drag performance of a nearground fishshaped bluff body originated from ostracion cubicus was studied. The results indicate that the nearground bluff body is actually low aerodynamic drag, whose characteristic is determined by the large boattailing angle of the model and the relatively simple vortex structure in the wake. Compared with the CD, Cp and wake structure captured by the simulation and test, the most accurate prediction for the aerodynamic performance is achieved by using the SST turbulence model.