The experiments and calculation indicate that the common Stokes formula is only suitable to the situation with small grain settling Reynoldnumber.
实验及计算表明：常用的斯托克斯公式仅适应于颗粒沉降雷诺数较小的情况；
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The paper introduces aerodynamic configuration optimization design of lower Reynoldnumber aeroplane using genetic algorithm, and makes prototypes to test feasibility and correctness of design.