| 1. | Turbulence or gusts produce velocity fluctuations .
紊乱性或阵息性使速度产生波动。 |
| 2. | Such grids effectively smooth out the velocity fluctuation above the dense bed .
栅格在密相床层上有效地使速度波动平缓起来。 |
| 3. | Experimental measurement of air flow velocity fluctuation of wind - sand flux
风沙流中风速脉动的实验测量 |
| 4. | Coefficient of velocity fluctuation
运转不均匀系数 |
| 5. | The correlation coefficient of velocity fluctuations - uv / u ' v " takes the shape of a reverse " c "
T颗粒两个方向脉动速度的相关系数一忑切’沿水深的分布呈一倒“ c ”形。 |
| 6. | The joint probability density distribution ( pdf ) of the velocity fluctuations falls along the directions of - u + v and + w - v especially for fine particles
联合概率密度主要沿一u v和十u ? v方向分布，粒径较小的颗粒更为明显。 |
| 7. | The probability density distribution of the particle velocity fluctuation differs in different flow regions , and is approximately normally distributed where the space restrictions are small . velocity fluctuation of particles with different sizes is similar
颗粒脉动速度的概率密度分布随流区有所差异；在空间尺度影响较小的范围接近正态分布；各种粒径的颗粒脉动速度具有相似的特性。 |
| 8. | Although the flux per revolution of the optimized pumps is a little smaller than that of tatsuno combined pumps , other characteristics , such as fluctuation rate , maximum pressure angle and velocity fluctuation rate etc , are much better . the methods to cut gears are proposed in the theory for the practical produce in the future
虽然，在体积相等的条件下，优化出来的外圆弧包络线内啮合齿轮泵的排量略小于tatsuno组合泵的排量，但其它性能（如：流量脉动率、最大压力角、速度波动量）都更优。 |
| 9. | The drag reduction of riblet biomimetic non - smooth surface is given out by numerical simulation with cfx . through analysis of velocity vector field and velocity fluctuation this article probe into drag reduction mechanism of unsmooth surface . through analysis of behavior of single microbubble and turbulent kinetic energy this article indicate drag reduction mechanism of microbuble
对仿生非光滑表面减阻机理,采用流体力学分析软件cfx进行了数值模拟,通过对速度场、剪切应力、涡量的计算结果进行分析,得出了仿生非光滑表面减阻几种主要原因。 |
| 10. | Around 40 ; the neutral curve obtained by the growth rates of the temperature fluctuation has a ringlike curve separated from the main branch of nachtsheim s calculation by velocity fluctuation at the lower grashof number side ; and its phase velocity is close to the maximum mean velocity where the critical layer of the eigenmode locates . the thermal fluctuation decays rapidly as the nondimensional frequency above 0 . 4 , so that it means that the coupling effect between instability wave generated by buoyancy fluctuation and velocity waves by invicid instability seems weak enough for their critical layers in the range of the nondimensional frequency
详细研究了自然对流边界层中最早失稳的浮力振型的功率谱波长波速与临界层位置等基本特征和它为主导其他振型尚未失稳时按线性理论得到的3种相互独立振型的振幅分布。系统地测量了它所对应的温度和速度涨落的振幅增长规律和中性曲线，实验结果表明，温度涨落的中性曲线在低格拉斯霍夫grashof数 |
