基于鸟翼后缘的仿生翼型的阻力数值模拟

Aerodynamic Performance of Bionic Foils based on Trailing Edge of Pigeon

基于对流体介质中典型动物信鸽减阻功能的研究,揭示了其低阻力翼羽独有的序贯排列方式;量化了信鸽翅膀翼羽后缘形态特征几何信息,并建立仿生模型,其展向后缘形态可以用波长与振幅(波峰、波谷)来限定。对仿生翼型模型的气动特性进行了数值模拟。结果表明,仿生翼型结构能够改善翼型的气动性能,阻力减幅高达9.1%。

The features of drag reduction of the representative pigeon in fluid medium were studied. It was found that the flight capability of the pigeon mainly depends upon the distinct sequential array of its high lift wing feathers. Quantify the geometric information about the leading edge shape of the pigeon wing, bionic models were built in which the trailing edge shape was defined by wavelength and wavecrest to wavetrough amplitude. The finite volume method and the pressure corrected SIMPLEC algorithm were used to simulate numerically the aerodynamic performance of the bionic airfoil model. The results show that at the condition of deep stall, the bionic airfoil model can improve significantly the aeroperformance, reduce aerodynamic drag by 9.1%.