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中文摘要：
采用标准k-ε湍流模型对一种新型的非光滑表面——凹坑形表面在空气介质中不同条件下的流动进行了数值模拟,可以得到光滑表面和半径0.4mm的半球状凹坑分布的非光滑表面在4～48m/s范围内的来流速度下的阻力系数.计算结果表明该凹坑形非光滑表面在这个速度区间内均能产生一定的减阻效果.在速度为24m/s时,它的减阻率达到最大的7.2%.最后本文对该非光滑表面的减阻机理进行了研究.
英文摘要：
The flow of a new unsmooth surface-dimple concave surface in air was simulated numerically and the drag reduction coefficients of both unsmooth surface and smooth surface with hemisphere of 0.4mm radius were presented. The result showed that this kind of unsmooth surface had a good drag reduction effect for flow velocity ranging from 4m/s to 48m/s. And it had the best reducing ability （7.2%） at a velocity of 24 m/s. The theory of the drag reduction was finally analyzed.
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