查询词典 endless flow

ABSTRACT In this dissertation, three-dimensional (3D) numerical calculation of flow field through a torque converter is carried out with inviscid flow model and viscous flow model.

本文从流体无粘流动和有粘流动两种模型出发，较系统的研究了液力变矩器流场的三维数值计算。

Read and write of flash disk as USB host.According to the request of this subject, the system hardware and software for the slave device, and the communication interface to the master PC are developed. Detailed works are as follows: in order to implement the measurement principle in the system, flow-liquid levelmethod is used;velocity of flow is measured through rotor Kinemometer;water level is surveyedvia RS485 interface and pressure sensor;the C8051F060 chip which is in high performance andintegration, produced by Silicon Laboratories Company as master chip is used to capture and measure the width of impulses, so singals of flow velocity are collected and disposed;the 4×4 matrix keyboard and LCD are used in the part of man-machine interface which are easy to input, legible to read, various to display, comfy to be accepted and plain to show measure and inquiry results;FRAM memory FM3164 is used to carry out the non-volatile memory of data and accurate real-time clock.;SL811HST chip is used as USB host which can read and write flash disk,thereby a kind of adscititious mass storage is accomplished .

根据研制任务的要求，课题期间主要完成了下位机系统硬件和软件，设计了与上位机的通讯界面，所做的具体工作包括：测量原理在系统中的实现，采用了流速—水位计算法，通过旋桨式流速仪来测量流速，通过RS485接口与压力变送器通讯测量水位；主控制芯片采用了Silicon Laboratories公司的高性能、高集成度C8051F060芯片，利用其捕捉测脉宽的特性，实现了流速信号的采集和处理；人机接口部分采用了4×4矩阵键盘和LCD显示，输入方便，读数清晰，显示多样化，信息量大，易于被用户接受，更直观地显示测量及查询结果；通过采用铁电存储器FM3164实现了数据的非易失性存储和精确的实时时钟；通过采用SL811HST芯片，实现了USB主机的功能，可读写U盘，从而实现了单片机的外挂式海量存储。

The PEOHRC product muter model to establish Product flow , conception of Product flow and model , effect of Product flow is build up in detail .

详细论述了建立产品流的PEORRC产品主模型结构，产品流概念及其模型，以及产品流的意义。

The results show that the Reynolds stresses of the flow near the wall at the exit are abviously nonisotropic and the flow fluctuation transport downstream with the flow speed.

结果表明埋入式进气道出口近壁区气流的雷诺应力呈明显的各向异性，其上游的气流脉动是按气流平均速度向下游传输的。

This paper gives the distribution of the Peynolds stresses, which shows that the flow near the wall at the exit is obviously nonisotropic and the maximal turbulence intensity is enough high to impact on the matching of the intake and the engine. The unsteady characteristics of the flow evince that the flow doesn't separate obviously.

出口截面上雷诺应力分布表明：该进气道出口流场主流方向的紊流强度较大，最大值已达8%以上，这给进／发匹配造成影响；正雷诺应力和剪切应力沿径向和周向的分布特点则说明进气道出口核心流区域流动基本是各向同性的，然而在近壁区却表现为明显的各向异性。

A computer-aided local transient flow property measuring system was developed using a high speed CCD camera coupled with optical fibers in order to study the Gas-liquid-solid three-phase jet loop reactors. SnO2 crystal films were orientally deposited on the alkoxysilane molecule-coated hydroxyl glass substrates so as to prepare surface-marked particles as the tracers. An image analysis system was established to identify different phases. Stroboscopic photography was utilized to extend the measure range. The developed measuring and analysis system was capable of determining accurately the local transient flow property in a G-L-S jet loop reactor. Based on the above system, local transient flow properties of gas, liquid, and solid phase were measured and studied the influences of fluid property, operation and configuration parameters on the reactor.

中文摘要：以气液固三相喷射环流反应器为研究对象，将高速CCD和光纤束耦合制成局部瞬态流动特性微机数据采集及图象处理系统，利用MPS硅烷分子在带有羟基的玻璃基底上的自组装引导SnO2晶态膜层在功能化表面上进行沉积，以获得表面标记的示踪粒子，解决图象处理技术与相的识别的问题，利用频闪技术拓展了测量上限，得到可以准确测定气液固三相喷射环流反应器中局部瞬态流动特性的测试系统；采用上述测试技术进行喷射环流反应器中局部气相、液相与固相瞬态流动特性的实验研究，并考察物性参数、操作参数与结构参数的影响规律。

We can draw conclusions from the results that in this model we can clearly observe the forming and ending process of pluglike flow and wavelike flow from their 4 -scale wavelet transform charts, and then get smooth oscillograms and detailed oscillograms, it can effectively identify flow regimes accordingly.

小波变换具有可对信号进行时频局部分析、信号局部特征提取和时变滤波等特点。本文通过对信号在不同尺度提取特征值，对气液两相流流型进行判别，从而建立了有效的参数检测软测量模型。

Then the flow in the curved pipe and reducing pipe was simulated through using CFD software, know that fluid passing curved pipe, reducing pipe can form secondary flow, vortex shedding, circumfluence, occur separation of boundary layer and periodic circulation flow, make the fluid pulsant, then cause the pipe vibrancy.

然后再应用通用CFD软件对具有弯曲和变径的热风炉管内流场进行模拟，得到当流体流过弯管、文氏管后形成了二次流、环流，并发生边界层分离和周期性旋涡脱落，它们会使后面的管流处于脉动状态，脉动状态的流体在管内流动时，会引起管道系统产生振动。

At constant viscosity, by increasing the liquid flow rate, the liquid film's velocity is increased; at the same experiment condition, the frequency of the liquid film is same at the same radial direction; the air current has minimum effect on liquid film bottom flow velocity, while it has an obvious effect on liquid film surface flow velocity. The longer the distance between liquid film and the inlet, the lower the pulsatory frequency and longer the wavelength.

在粘度基本不变的情况下，随着液体质量流率的增加，液膜流动速度随之增加；在同一个实验条件下，沿圆管径向各质点的频率基本保持不变；气流场速度对液膜底层流动速度影响很小，对于液膜表面流动速度有着较大的影响；沿液膜流动方向，液膜的脉动速度逐渐增加，脉动频率降低，脉动波长变长，与报道的通过快速摄像得到的液膜发展趋势一致，证实用PDA研究液膜流动是可行的。

It discusses the forming of the competitive advantage, cost advantage and diversity advantage of the enterprise under the management of the value chain, as well as the operation chain-the basis of the value chain. From the angle of the combination of funds flow, value flow and information flow, the article also researchs the cost of the enterprise operation and its motivation, which lay a foundation for the optimization of the operation chain and the reducement of the operation cost together with the realization of the optimization of the inner value chain of the enterprise.

本论文从企业竞争战略的视角，对企业竞争战略与企业价值链进行系统分析和深入研究，探讨价值链管理环境下企业竞争优势的形成，研究价值链环境下的企业成本优势和差异化优势，对构成价值链的基础——&作业链&进行分析；从资金流、价值流和信息流有机结合的系统观点，研究企业的作业成本，对企业成本动因从战略层面上进行分析，为优化企业&作业链&，降低作业成本，实现企业内部价值链优化奠定了基础。

In this new architectural plan the Garden of Golgotha came to be at the centre of the new city.

Aelia 是高举他自己，并在此城内朝拜罗马诸神。

The continuous nature of peat accumulation means that terrestrial coaly rocks may provide a higher resolution and more complete record of base-level change than the time-equivalent shallow-marine strata, thus enabling the identification of highfrequency cycles that are not recorded in themarine strata.

泥炭积累的持续性质的手段，陆地coaly岩石可提供较高的分辨率和更完整的记录基准面变化的影响时，相当于浅海阶层，从而使确定的高频周期，不记录在themarine 阶层。