Drag Reduction Characteristics of New Groove Surface with Different Groove Sizes Distribution
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摘要: 针对新型不同尺寸分布V型脊状结构，对其湍流边界层减阻特性进行了研究，根据新型脊状结构形状特殊性的特点，对其计算域、计算网格及其流动参数进行了合理化处理，采用雷诺平均N-S方程和RNG k-ε湍流模型计算新型脊状表面的湍流边界层流动和粘性阻力。通过与常见等尺寸脊状表面及光滑面的对比得出，新型脊状表面具有良好的减阻效果，减阻量近15%；新型脊状结构更有利于“二次涡”的形成与发展，而“二次涡”是产生并影响减阻效果的根本原因。Abstract: For the new V-groove surface with different groove sizes distribution, the drag reduction characteristic of turbulent boundary layer is studied. According to the particularity of the new groove shape, the computation region, grids and flow parameters are dealt with reasonably during the numerical simulation. The flow in turbulent boundary layer and the viscous drag over the groove surface are numerically simulated using the N-S formula and RNG k-ε turbulence model. Compared with popular simple size groove surface and smooth surface, better drag reduction characteristics can be achieved on the new groove surface with a maximum drag reduction almost 15%. The new groove structure is in favor of second vortex formation and development, which fundamentally resulting in the drag reduction.
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Key words:
- new V-groove surface /
- drag reduction characteristic /
- second vortex
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