查询词典 riblets

In order to reduce the skin friction efficiently,more research works should be done on the characteristics of turbulent boundary layer,turbulent coherent structures and the mechanism of turbulent drag reduction for flow over riblets surfaces.

为更有效地减少表面摩阻，必须深入开展对沟槽面湍流边界层特性、湍流拟序结构及湍流减阻机理等方面的研究。

Vehicle models with smooth surface and riblets surface were tested respectively at various velocities and attack angles in a wind tunnel. Drag characteristic curves were acquired through tests.

在风洞中对具有光滑表面和脊状表面的航行器模型在不同风速和攻角下进行阻力测试，得到其减阻特性曲线。

Based upon the new explanation of the structure of turbulent boundary layer and the fact that specially designed non-smooth surface can reduce fluid drag,the authors have designed and fabricated the Riblets Drag Reduction Film.

作者根据湍流附面层结构新的解释及非光滑特殊造型表面可以减小流体阻力的事实，作者研制了微肋条减阻薄膜，贴在赛船上参加比赛，获得好成绩[1、2 ] 。

In allusion to the characteristic of riblets surface, the computation region, grids and flow parameters were dealt with reasonably, and mechanic similarity principle was brought forwards into fluid field numerical simulation.

针对沟槽表面流场的特点，在数值计算过程中对其计算域、计算网格及其流动参数进行了合理化的处理，并尝试将力学相似原理运用于沟槽表面流场的数值仿真。

Results of simulation indicate that a series of "second-vortex" are produced in the riblets structure, turbulent kinetic energy and turbulent burst intensities are debased, which reveals reasonably turbulent drag reduction mechanism.

数值仿真结果则发现，在脊状结构内形成了稳定的&二次涡&，边界层内湍动能和湍流猝发强度降低，很好地揭示了减阻机理。

At three Reynolds numbers, a thermal anemometry IFA3oo is used to measure the average-velocity and time-sequence pulse velocity at different y+ points in the wtulent boundary layer on smooth as well as riblets plate surface respectively.

在三个雷诺数下，分别对二维流场的光滑壁面和沟槽壁面湍流边界层，用热线风速议作了试验。

The results of simulation show that a series of "second-vortex" are produced when streamwise "reverse-vortices" are effected by riblets. They weaken intensities of "reverse-vortices", and restrain the productions and developments of low-flow strips, so turbulent drag reduction is obtained.

仿真结果表明，沟槽表面与顺流的&反向旋转涡对&相互作用，产生&二次涡&，削弱了&反向旋转涡对&的强度，进而抑制了低速条带的形成和发展，从而降低湍流猝发强度，实现湍流减阻。

The experimental velocities cover subsonic,transonic and supersonic flows,and the content includes:(1) flow over flat plate,revolution body and wing with riblets surface at zero angle of attack;(2) the effect of pressure gradient,angle of attack and slide angle;(3) the burst characteristics,characteristics of turbulence,the streak structure in the near wall region and the drag reduction mechanism.

内容涉及沟槽面平板、旋成体、机翼等在压、跨、超音速流动情况下的实验研究成果；压力梯度、攻角、侧滑角等的影响；湍流猝发特性、紊动特性、近壁区带条结构的特征及减阻机理等方面的工作。

Lt is discovered that the riblets with drag reduction reduce turbulent density and turbuleni dynamic energy in tuthulellt boundary layer, but they affect the flat coefficient insignificantly.

分析了减阻沟槽对平坦系数、湍流度、平均湍动能等参数的影响。减阻沟槽使湍流度、平均瑞动能减小，而对平坦系数的影响不明确。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。