结果很好

In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

本文首先对虹吸式排水系统理论计算方法、适用范围以及注意事项做出总结，并分析了虹吸式排水系统的优势；再对虹吸式排水管道进行原型试验研究，采用不同管径不同立管高度，对系统流量、管道压强进行量测，观察了各种工况下的流态，对其水力特性进行研究分析，找出影响水力特性的落差、管径主要因素以及与排水量的关系；进一步应用计算流体力学Fluent软件，采用标准κ-ε模型与RNGκ-ε模型，计算过程应用有限体积法和二阶迎风格式对数值模型进行离散，速度和压力的耦合采用SIMPLE算法，分别对系统弯管段、虹吸排水管道试验系统、多斗虹吸式排水系统进行数值模拟分析，通过改变管段弯头处半径、管段出口负压值、增加雨水斗数对不同工况下系统内部的速度和压力进行研究；本文首次采用结合原型试验与数值模拟相结合的方法，对虹吸式屋面雨水排水系统进行研究，试验与模拟相互验证，并进行拓展，很好地解决了虹吸式屋面雨水排水系统由于试验条件限制问题，结果正确合理，为排水管网系统设计和优化研究提供了有效的方法，对工程设计有较好的参考价值。

The results showed that inhibitory effect of disodium dehydroacetate was much stronger than that of sodium benzoate,therefore it has high potential to be applied to the fruit preserves industry.

实验结果显示，脱氢醋酸钠在蜜饯糖渍过程中对菌落总数和酵母菌有很好的抑制作用，效果明显好于苯甲酸钠。

The deep study of probability of density function of MN's sojourn time of the handoff area will give very efficacious guidance of the time to trigger L2-triggers. The results of simulation show that the method of triggering L2-triggers by using forecast of channel quality will get the ideal effect.

对MN在切换区域内的时间分布概率密度函数的深入研究，为触发L2T的时机选择提供了很好的指导作用，仿真结果表明我们提出的采用信道质量预测提前触发L2T的方案可以获得非常理想的结果。

It was showed nice stability and applicability, as well as the specificity and sensitivity.

结果表明这个方法具有很好的稳定性和实用性，特异性和灵敏度都较好。

The results showed the morphology of AMMN was mostly spherical and well-distributed, the mean diameter of the nanoparticles was 15 nm and the diameter ranged from 10~20 am and its Zeta potential was about +29.3 mV. These nanoparticles had tremendous durability in acid solution at pH 2.0 while the untreated particles are corroded in acid solution.

结果显示，精氨酸修饰的磁性纳米颗粒均匀，分散性好，大多呈圆球型，平均粒径为15 nm，粒径范围10~20 nm，其Zeta电位为＋29.3 mV；多层修饰的纳米磁粒在pH 2.0的酸中具有很好的耐酸性能，而未处理的纳米粒子在酸溶液中发生了溶解。

Comparing the unsteady flow fields obtained by CFD with the measurement results with SPIV, it can be found that the CFD results can capture the main characteristics of the flow fields observed in the experiment results, however, the precision of the CFD needs to be further improved, and to predict the detail flow structures, such as the tip leakage vortex in the compressor rotor, by CFD still has some difficulties, thus, some work should be done to improve the turbulence model for more accuracy prediction of the flow fields by CFD for the complex flow in turbomachinery.

定常计算结果和非定常计算结果都不能很好地反映出转子叶尖泄漏流，转子尾迹和泄漏流在静子通道中的演化，及其与静子的相互作用等复杂流动情况。开展叶轮机适用的湍流模型研究，对于提高叶轮机内部复杂流动数值模拟的准确性具有非常重要的价值。

And then, the application studies of dynamic characteristics of a core engine rotor system with ERSFD, the squirrel-cage spring support with PSFD, the pull-rod spring support with SFD and support without any damper were conducted respectively on an engine test cell, and compared the results with each other.

研究结果表明：ERSFD的理论与实验分析结果有很好的一致性，计算程序是可信的。ERSFD比SFD有更优良的油膜力特性，能适应更大的不平衡量范围。ERSFD不仅能减振而且能调频。

Simulation results show that variational velocity integral PID can solve supercalender velocity drop better and improve system control efficiency.

仿真结果表明，变速积分PID能较好地解决超级压光机速度跌落问题，使系统控制效果得到很好的改善。

Thirdly, the subsonic, transonic and supersonic flutter critical speed of wings and aircraft is numerically simulated. Some numerical results are in good agreement with experimental data.

分别以某后掠机翼和超临界机翼为算例，对机翼的静气动弹性问题以及基于静气动弹性的型架外形优化设计和飞行姿态确定进行研究，计算结果和有关文献的结果进行了比较，吻合很好。

Based on the above study, a program is developed which calculate the modeled subgrid stresses, and is applied to simulate the turbulent flow in a plane channel. The computational result is compared with the data extracted form a DNS database, and the agreement is satisfactory. A numbers of physical phenomenon has been reproduced in the simulation, including hairpin vortex and counter-rotating rolls in near wall region, intermittent vortex structure, the maximum of pressure clustering in wall area and the high-speed fluid sweep into the low speed fluid, and the ability of the LES to simulate turbulent flow is well shown.

在对LES技术学习掌握的基础上，编制了亚网格模型的计算程序，在三维平板通道流动的具体计算中应用大涡模拟技术，并与DNS计算结果进行了比较，得到了满意的结果，三维通道中的重要流动现象被很好的预示出来，包括近壁面的发卡涡，对旋涡，间歇猝发涡结构，压力最大值向壁面的倾斜，高速流体对近壁面流体的下扫，卷掠等，显示了大涡模拟技术对湍流流动模拟的能力。

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。