The calculation method of aerofoil friction drag in compressibility viscous flow is studied in this paper, including the calculation of laminar boundary layer in the front of the aerofoil by modified Thwaites method and the calculation of turbulent boundary layer by Green's method. 本文研究了一种可压缩性粘流绕翼型的摩擦阻力计算方法。这种方法包括用修正了的Thwaites~[1]法计算头部层流边界层以及按Green~[4]法计算湍流边界层。
Factors of intraspecific differentiation among the populations of Allium hookeri Thwaites were discussed. 本文最后讨论了宽叶韭种内居群间核型分化的原因。