查询词典 turbulent flow

The unsteady flow induced by two blunt bodies between two parallel walls is compared with the STARCD software result. The unsteady turbulent flow field within impeller and vaned diffuser in centrifugal fan is computed for the first time in China.

对Couette流动和同轴旋转圆柱面间流动的计算验证了移动网格方法和改进后PISO算法的可靠性；进而对平行平板间两相对运动钝体绕流的非定常流场进行了计算，其结果与STAR-CD软件结果一致。

Considering the characters of the viscoidal turbulent flow over high-speed train,the computing model of the outer fiow field for high-speed train has beenestablished based on the incompressible fluid Navier-StOkes epuation and theturbulent model of ke two equations. The equation set of the flow field problemvia finite element methods has been set up.

根据高速列车粘性紊态绕流的特点，在较少简化的条件下以Navier-Stokes方程和κ-ε两方程紊流模型为基础，建立了高速列车外流场的计算模型，在近壁区域采用壁面函数修正紊流模型。

Then, we combine the analysis of the scale-effects with the simplification of the NavierStokes equations, and study numerically the feasibility and efficiency of the generalized diffusion parabolized Navier-Stokes equations and the large-small scale equations applying to the high Reynolds number flows (GNS for laminar flow and LSS for turbulent flow).

首先从数值方法上构造了一些高精度差分格式，然后将尺度效应的分析与流体力学基本方程组的简化近似相结合，通过数值分析和计算研究了广义扩散抛物化NS方程组和流体运动大小尺度方程组用于高Re数流动的可行性和有效性。

The turbulent flow in open channel with a vegetated region was studied based on the theory of shallow water flow.

针对浅水问题研究了带有植物的河道水流紊流运动。

Based on the 3D time-average Navier-Stokes equations, k-ε model was used to simulate the 3D turbulent flow field of whole flow passage in the Francis turbine including guide wickets, runner and draft tube. The energy performance and cavitation performance were predicted from the simulation results, and the calculated data were compared with the results of hydraulic turbine model experiment. The calculation of turbine efficiency and the measured efficiency was very closed and the maximal relative error was 0.9%.

该文基于Navier-Stokes方程和k-ε紊流模型，采用贴体坐标和交错网格系统，用SIMPLEC算法对一模型混流式水轮机引水元件、转轮和尾水管进行了联合计算与转轮单流道计算，数值模拟了水轮机各通流元件内部三维湍流流场，预测了水轮机的能量性能和空化性能，并与水轮机模型试验结果进行了对比。

The synthetic gas and ash composition heat transfer and flow in vertical pipe of coal gasifier are simulated and analyzed by the theory and program presented. The temperature、velocity and concentration variations of synthetic gas and ash composition are accomplished. The influences of coal gasifier working condition and vertical pipe parameters on the gas and ash cooling process are discussed. The law of solid-gas two phase turbulent flow and heat transfer is further revealed.

本文还应用上述理论和程序，在国内首次对气化炉激冷室下降管内合成气和灰份的流动和传热过程进行了数值计算和分析，得到下降管内合成气和灰份的温度、速度和浓度等参数的变化，还讨论了气化炉运行参数和下降管结构参数如气化温度、下降管尺寸、灰份性质等参数变化对合成气降温过程的影响，进一步揭示了下降管内气固两相的流动和传热规律。

A k-e-kp-e p two fluid model was introduced to study three dimensional flow behaviors of dense phase pneumatic conveying of pulverized coal in vertical pipe on the basis of the kinetic theory of granular flow, taking into account the turbulent interaction between gas phase and particle phase.

基于颗粒动力学理论，采用k-e-kp-e p湍流模式，对垂直管内高压密相上升流的三维流动行为进行了数值模拟，其颗粒浓度高达30%，并对部分模拟结果进行了实验验证。

Main research works are as follows:(1) Numerical simulation of turbulent flow and combustion in power plant furnace (2) Numerical simulation of fire spread and crown fire in forest fire behave (3) Numerical simulation of burning process of large space building (4) Numerical simulation of three-dimensional fluid flow of satellite cabin in microgravity environment (5) Numerical simulation of burning process of multi-rooms It shows that the ability of FAC3 and FZ code is strong and the code is widely used for practical problems.

研究工作主要涉及以下几个方面：（1）电站煤粉锅炉流场的数值分析（2）林火行为中火蔓延和树冠火等特性的数值研究（3）大空间建筑火灾烟气流动过程的数值分析（4）微重力条件下卫星密封舱内部流场的数值分析（5）多室火灾过程的数值分析研究工作表明，FAC3和FZ程序的功能较强，通用性较好，可对多种热过程现象进行数值模拟，在一定程度上讲，即可用于科学研究，又可用于实际工程问题，并具有广泛的应用前景和推广价值。

On the basis of three-step finite element method, the flow past circular cylinder with splitter plate is analyzed by using large eddy simulation turbulent model in single direction flow.

在三步有限元数值方法的基础上，利用大涡模拟湍流模型对单向流作用下带横隔板圆柱绕流进行了数值分析。

For aero-optic problem, however, even in the case of relatively slow (0m/s) turbulent flow, a minimum wave-front-sensor bandwidth of approximately 2kHZ. For aberrating flow fields associated with airborne optical system, bandwidth ranging from 30 to 100kHZ are needed.

气动光学则通常与光通过湍流剪切层等一类问题相关，例如机载光学成像系统、光学制导系统等，发射或者接收的光都必须通过飞行器表面由于飞行所形成的剪切层或者飞机尾流。

A fleet of four Japanese vessels left Shimonoseki harbor in Western Japan to begin its five-month whale hunt in the Antarctic Ocean.

这是一个在哪都让鲸鱼观察者愤怒的例行公事。11月8号，由四艘日本船支组成的舰队离开日本西部的下关海港，开始为期5个月的南极海捕鲸活动。

Such possibilities seem to be envisaged by those who are presently advocating a "new" or "free" education, and it does seem a bit arbitrary to say that what they are envisaging just is not a form of education, even if it turns out to be desirable and morally unobjectionable.

这些可能性，似乎正被当前那些提倡"新"或"自由"教育的人构想，随意一点说，他们正构想的不仅仅是教育的形式，即使它转化为毫无异议地符合意愿和道德。