查询词典 wake flow

The advantage of CFD numerical simulation especially displays in the development of the new products, it not only can replace theroutine experiment and offer various kinds of flow characteristic parameters by a large margin , It not only can replace conventional experimental substantially provide various flow parameters, and reveals through three-dimensional flow field pattern to optimize design based on detailed. CFD numerical simulation in this text applications will greatly enhance the cage control valve design and the technical level and product quality, reducing cage control valve design and processing cycle, significant cost savings, And optimizes through the flow channel, to reduce fluid flow through the valve of energy loss, improving efficiency in the use of energy have the extremely vital significance.

CFD数值模拟的优势尤其表现在新产品的研制开发中，它不但能大幅度取代常规实验提供各种流动特性参数，而且能通过揭示流场三维分布形态为优化设计提供详细依据；文中所采用CFD方法必将大大提高套筒型调节阀设计的技术含量与产品质量，可缩短调节阀的设计和加工周期，节省大量成本，并且通过流道优化，对降低流体流过调节阀的能量损失，提高能源利用率等具有十分重要的意义。

3The transience multiphase flow software was employed for simulating pipeline's slug flow behavior in this paper. The computational results of OLGA have been interpretted by relevant theory.The changes of pressure and holdup in the slug flow analyzed were explained, and its inherent regularity was also revealed in detail.Through which, the cause to slug flow was found out, and the flow type of slug could be suppress or controlled effectively.

3采用瞬态多相流软件对管道流动特性进行模拟研究，用相关理论解释OLGA软件的计算结果，主要针对段塞流压力、持液率的变化规律进行分析，详尽地揭示其内在规律，确定段塞流产生的原因，并进行模拟控制调节。

For gas flow past cylinder, the characters of flow field in different Mach number and Knudsen number condition were investigated, and especially for low Knudsen number cases, the results were compared with calculating results of Euler's equation. It showed that they are correspondent by comparing the characters of bow shock and wake. The convergence rates of different high resolution and implicit schemes were also investigated. The convergence behavior of the implicit WENO scheme developed in this paper is better than others. For gas flow past NACA 0012 airfoil, the calculating results were compared with results of experiment. It showed that the results of WENO scheme are of higher accuracy for the case with angle of attack.

在圆柱流场时，我们探讨不同马赫数且不同纽森数时的流场特性，并在低纽森数时，与那维尔-史托克方程式的计算结果比较，我们比较了弓形震波及尾流附近的特性，其结果是相当符合的，同时我们也比较不同高解析隐式算则的收敛历程，从收敛历程图可得到，本文发展出来的隐式WENO算则有较佳的收敛效果；在NACA 0012翼形的流场中，我们将与实验结果做比较，发现利用WENO算则计算的结果，对於具有攻角的流场，亦有相当高的准确度。

The different methods of controlling wake flow in engineering are introduced according to concept of absolutely and convectively unstable wake.

本文利用数值方法研究了静止圆柱和振动圆柱在不同流动条件下绕流流场的非定常性、不稳定性和非线性特征。

As such the mechanism of particle transfer in a fully developed wake can be explained as: move around vortexes and forward with wake flow.

因此粒子在充分发展尾流中的运动可以描述为：一边绕涡团运动，一边随涡团向尾部运动。

The Frechet derivative of the cost function is determined via the solution of an adjoint partial differential equation, and the boundary shape is then modified in a direction of descent. This process is repeated until an optimum solution is approached. The advantage is that the cost function variation is independent of the flow field variation, with the result that the gradient of cost function with respect to arbitrary number of design variables can be determined without the need for additional flow-field evaluations. So each design cycle requires the numerical solution of both the flow and the adjoint equations leading to a computational cost roughly equal to the cost of two flow solutions.

虽然他们的研究成果大多数都可以在公开性文献上看到，但是其中一些具体的细节问题的处理方法却没有透露，比如：伴随方程如何离散求解才能减小最终梯度计算中的误差，使得设计过程有效地进行；伴随方程与流动方程的边界条件是不同的，如何合理地处理伴随方程的边界条件，才能推动设计过程朝着设计目标而发展；在减阻问题中目标函数如何定义，求解梯度的具体数学公式如何推导，如何通过数值方法来实现它们等。

China Southern Jilin Branch flights through continuous optimization of the structure, improve the route network, aircraft frame good enough "air bridge" is to strive to achieve "Let China Southern to become the first choice for customers, the communication between China and the world has become a shortcut to" mission, to strengthen the Jilin Province internal and external trade, tourism and cultural ties to stimulate the flow of people inside and outside the province, logistics, business flow, capital flow, information flow, for the national and local economy and good and fast development, a positive contribution to make due.

南航吉林分公司通过不断优化航班结构，完善航线网络，架好架足"空中桥梁"，就是要力争实现"让南航成为客户的首选，成为沟通中国与世界的捷径"的使命，为加强吉林省内外经贸、旅游、文化的交流联系，带动省内外的人流、物流、商流、资金流、信息流，为国家和地方经济的又好又快发展，做出应有的积极贡献

Results The direct flow rate reached 0.549L/min when pressure difference was 4.90kPa(500mmH_2O), and the antidromic flow rate only reached 0.028L/min when pressure difference was 4.90kPa(500mmH_2O), the direct flow rate is much more than the antidromic flow rate.

结果：当瓣膜两端顺向的压强差为4.90kPa(500mmH_2O)时，流量可达0.549L/min；当瓣膜两端逆向的压强差为4.90kPa(500mmH_2O)时，流量为0.028L/min，顺向压差的流量大于逆向压差的流量。

The binomial deliverability equation can only be used to describe the high velocity non-Darcy filtering flow. For low permeability fracturing gas wells, due to low permeable property and high flow conductivity of the formation, the filtering flow laws of the formation are different from those before fracturing, and binomial deliverability equation can not be used for the flow condition of gas wells, therefore, new equation is needed.

二项式产能方程只能描述高速非达西渗流，对于低渗压裂气井，地层的低渗透性和裂缝的高导流能力使得其渗流规律已经和压裂前大不一样，二项式产能方程已无法描述气井的生产状况，必须建立新的方程。

During the development of tools, it is evident that data flow diagram"tool is very necessary for rapidly carding the complex outer and inner data flow of function area, and for solving the problem of researching and analyzing the complex information flow toward the whole enterprise in deed, and for offering important basis and reference for building the information system"s logic model of entir enterprise.The paper especially designed and realized the visual tool of data flow based on Information Resource Planning system.In face visual tool is a strategic data-analysis tool and an important organic part of Information Resource Planning tools.It emphasizes wholly conformity with planning repository and brachylogy and practicality.

结合工具开发，认识到要迅速理清数据在企业各个职能领域之间和内部的复杂流动，要真正解决面向企业整体的复杂信息流调研和分析的问题，必须有数据流工具的支撑，为科学建立整个企业信息系统的逻辑层模型提供重要依据和参考，论文着重进行了基于信息资源规划体系的数据流可视工具的设计与实现，实质上是高层的数据分析工具和信息资源规划工具的有机组成，并且工具与规划元库充分整合，统一标准和规范，强调简明和实用。

I go to school at night.

我是上上学。

Clear Tip Nasal Aspirator: A soft time and gentle suction action makes removing excess mucus easy.

鼻吸明确提示：一个柔软的时间和温柔吸力行动使消除过剩的粘液容易。