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To verify the accuracy of CFD simulations, experiments were carried out. The results of simulations with user defined function of the effects of impeller type and stirring rate on the velocity field were in good agreement with the output of particle image velocity. The oxygen mass transfer model can be used to predict the process of oxygen mass transfer in a vessel, and the logarithmical expression can successfully describe the relation between the oxygen concentration and the dissolution time.

结果表明,(1)采用Fluent软件并结合用户自定义方程(user defined function, UDF)能够很好地模拟出实际搅拌器内流场分布,模拟结果与采用粒子成像技术(particle image velocity, PIV)的实验测量结果相符;(2)采用氧气传质模型能预测氧气在搅拌器内的动态传质过程,同时氧气浓度与溶解时间的对数关系式能较好描述试验搅拌器内氧气动态传质过程;(3)在相同搅拌速度下,圆盘涡轮式搅拌器产生的湍流动能分布范围要大于桨式搅拌器产生的湍流动能,而且湍流动能分布更均匀,湍流强度更大。

The veracity of the simulation results is validated by experiments and the effect of the size of capillary hole on vacuum degree is analyzed. The parametrical modeling, simulation, and optimization design of vacuum package process of MEMS devices are realized.

通过实验初步验证了模拟结果的准确性,分析了毛细孔尺寸对腔体和烘箱真空度的影响,实现了MEMS器件真空封装工艺的参数化建模与模拟和仿真优化设计。

Firstly, the high resolution pictures of dragonfly wings from sample tests were studied thoroughly, and the unique feature of the reticulate vein distribution and the variation of the vein sizes and the grid shapes in different zones were figured out;then several computational models based on a dragonfly wing were established by using ANSYS, and beam 189 and shell 93 elements were used respectively in modeling of the veins and the membrane so as to ensure the compatibility between the veins and the membrane at a deformed state;these models subject to uniform loading cases were analyzed respectively so as to explore the unique performances of the wing structure, furthermore, through eigenvalue spectrum analyses of these models, the special role of the pterostigma in eliminating or suppressing the wing quivering effect was also evaluated.

首先,对实验中获取的高清晰度的蜻蜓翅膀数码图片进行了细致地分析,找出了翅膀网状翅脉结构中翅脉的分布规律与尺寸变化、网格形状的差异及不同形状网格的分布等独特的结构特征;再利用ANSYS建立蜻蜒翅膀网状翅脉结构模型,采用三节点等参数梁元beam189模拟翅脉和八节点等参数曲壳单元shell93模拟翅膜,以满足翅脉和翅膜间的变形协调性要求;通过非线性数值分析,探索了蜻蜓翅膀网状翅脉结构在均布荷载作用下所具有的独特的结构性能;通过模态分析,揭示了翅膀前缘靠近翼尖附近的翅痣在翅膀消震减振中所发挥的作用。

For pressure drop reduction and collecting efficiency incretion of the air filter, using computational fluid dynamics simulation technology and combineing with the way of experimental test, particles trajectories and distribution rate of deposition in air filters were calculated simulatively, the position where the particles reside easily was obtained.

为提高空气滤清器的减阻增效,采用计算流体力学模拟技术,结合实验测试的方法,模拟计算颗粒在空气滤清器中的运动轨迹和颗粒在滤清器中沉积的分布率,得出颗粒在滤清器中容易沉积的部位。

Fourthly, in baffled and unbaffled reactor, the improved ALE (Arbitrary Lagrange-Euler) method is applied to compute and simulate the 3D-flow field of air-water mixture, the velocity and kinetic energy distributions are analyzed and the processes of flow development are simulated, the results are validated with flow visualization experiment.

然后,采用改进的ALE(Arbitrary Lagrange-Euler)方法,对有、无挡板的反应器的气液混合物三维流场进行数值计算和模拟,分析了反应器内的速度和动能分布,模拟了流场的发展过程,并用流场显示实验进行了验证。

The low-permeability rocks and micrite for modeling the crust of the overpressure system were broken under the action of overpressure fluid,while the sandstone for modeling the uncompacted belt of overpressure system was not broken.

在实验过程中,模拟超压系统&壳&的低渗透岩石—泥晶灰岩发生了破裂,而模拟超压系统&欠压实带&的高渗透砂岩却未发生破裂。

The lower permeability rocks-micrite and muddy siltstone which modeled the "crust" of overpressure system have been broken by overpressure fluid, while the sandstone modeled the "uncompacted belt" of overpressure system have been not broken.

在实验过程中,模拟超压系统&壳&的低渗透岩石—泥晶灰岩发生了破裂,而模拟超压系统&欠压实带&的高渗透砂岩却未发生破裂。

We selected wuli lake, seriously polluted lake, and used long-term laboratory sludge-dredging method to compare the difference of dredged zone and undredged zone, we conducted sludge incubated experiment of two depth of dredging to analyze the difference of nutrient''s release. We investigated the budge of phosphorus monthly and monitored the concentration of phosphorus of the water simultaneously, and analysised the change of the content of phosphorus of water body and further studied the effect of sludge-dredging on the content of phosphorus in water body.

本研究以污染严重的太湖五里湖为研究对象,对室内长效模拟和疏浚区/非疏浚区比较,进行了两种不同模拟疏浚深度的底泥培养实验,同时对疏浚后环五里湖河道进行了磷出入湖量和湖面磷含量同步调查分析,分析底泥疏浚前后水体磷含量变化,结合逐月出入湖量的初步分析,研究疏浚对湖水中磷含量的影响。

In this thesis, we valuate the correctness of the light simulation soft ware by experiment. The simulation was found to be coincidence with experiment.

在本论文中,我们将利用实验的方式验证光学模拟软体的正确性,发现软体的模拟结果与实际上量测的结果相符合。

And the axial and horizontal section temperature distributions of simulation were compared with the results of the experiments. They were almost identical except some difference near the heating tubes. The results of the simulation were used to compute the local heat transfer film coefficients on the out surface of vertical tubes at different height.

利用计算流体力学软件CFX-4对层流状态下PBT桨搅拌槽中甘油的温度场进行了数值模拟,并将所计算的轴向、水平剖面温度分布与实验所测量的结果进行了对比,发现虽然在列管附近二者存在着一些差别,但模拟结果基本可以反映槽内温度场的分布情况。

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