紊流

The calculation of the rotordynamic coefficients of a multistepped annular seal in hydraulic turbines is discussed in this paper. Based on the Hirs' turbulence lubrication theory and the bulk flow model, the governing equations for the flow in the seal are developed by using the Moody's friction equations. The governing equations are perturbed when the rotor and the stator are coaxial. The Runge Kutta integration method and the Newton Raphson iteration method are used to solve the perturbation equations....

本文首先在Hirs紊流润滑理论的基础上，采用体积流动模型及Moody摩擦方程建立起阶梯口环水封中流体流动的控制方程，将各个方程在转子与定子同心处进行摄动，采用Runge－Kuta积分法及迭代过程求解摄动方程，建立起水轮机阶梯式口环水封的转子动力特性系数的计算方法，为水轮发电机组轴系的动力学分析提供了必要的理论基础。

High shearing stress can be gained by turbulence or by increasing gel strength of grout.

高的壁面剪应力可以通过紊流获得，也可以通过提高水泥浆粘切力获得。

Experiment and flow visualization are conducted in a water-filled cavity which cover the range of Ra=1×10〓----6×10〓 and Pr=3. 3---6. 5. Similarity theorem is applied in analytical investigations. And core region stratification effects to heat transfer are studied. By using scale analysis, temperature and velocity profiles in turbulent natural convection boundary layer are obtained. The results reveals that for turbulent natural convection in enclosures, the bulk of the cavity fluid is essentially statement with thermally stratified temperature and the only substantial motion is that in the boundary layer along four side walls.

在实验方面，作者在高Ra范围内（Ra〓=1×10'~Ra〓=6×10〓，Pr=3.3~6.3）对封闭空间实验台以蒸馏水为介质进行了换热实验与流动显示；在理论分析方面，作者采用相似原理导出了分析解；研究了核心区温度分层规律及其对换热的影响；另外还运用尺度分析法探讨了紊流自然对流边界层温度与速度分布。

The response of a helicopter to the atmospheric turbulence is investigated in this paper.

本文研究了直升机在大气紊流中的响应。

Do not drink hot tea and coffee: In the aircraft, turbulence is possible at any time.

不喝热茶和咖啡：在飞机，紊流是随时都可能发生的。

In order to study the velocity distribution in open channel, a 3-D turbulent numerical model is established firstly.

为研究各种断面明渠的流速分布，本文首先建立了一个三维紊流数学模型。

With k- e turbulent model and wall function presented by Launder and Spalding, numerical results of viscous resistance coefficient, isoplethic maps of velocity and stress contributions areobtained.

采用k-ε紊流模式及Launder和Spalding提出的壁函数进行数值模拟，得到了该双尾船船体粘性阻力及速度、切应力的等值线分布等结果。

Stenoses, and ealuation of carotid disease in patients with arrhythmias, alular heart disease, or cardiomyopathy.

由于CTA依靠造影剂灌注识别狭窄的血管腔病变，很少由于血流紊流和动脉扭曲而过高估计血管狭窄。

In this paper,a one-dimensional turbulent ignition model of the pulverized coal air flow in a bube is established on the basis of the one-dimensional plane laminar flow ignition model .

在一维平面层流煤粉气流着火模型的基础上，提出了一种一维平面紊流煤粉气流的着火模型。

First,the heat transfer and friction characteristics of six finned channels are studied experimentally.

在实验研究方面，本文研究了六种强化通道在紊流范围内的传热及阻力特性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。