【摘要】 引用大气边界层端流资料计算和分析了有关测量混沌的特征量:功率谱,关联维数,Lyapunov指数和Kolmogorov熵。结果表明:大气边界层湍流是一种混沌运动,在相空间中为一奇怪吸引子,为了在相空间中支撑起这样的吸引子,至少需要由7—8阶的确定性非线性偏微分方程(或者说需要由7—8个变量)才能对大气端流进行描述。更多还原

【Abstract】 By using turbulence data obtained from the atmospheric boundary layer,thecharacteristic quantities describing chaos in respect of power spectra,correlation dimen-sion,Lyapunov exponents and Kolmogorov entropy are calculated and analyzed. Resultsshow that the atmospheric turbulence is a chaotic motion and possess strange attractorsin phase space,and a deterministic nonlinear differential equation with at least 7-8 or-ders (or 7-8 variables) for holding the strange attractors in phase space is needed to de-scribe the turbulence.更多还原