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Simulation on the Flow Field of Centrifugal Pump Based on Fluent .926-930.1743

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Abstract: In this paper, the software Fluent was employed and the two-dimensional flow fields, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the flow, velocity, pressure and turbulent kinetic energy distribution are significantly different and asymmetric. The results have referenced significance for design and analysis of the Centrifugal Pump. 1 Introduction Centrifugal pump that is the important fluid conveying equipment is not only widely used in the high performance pump industrials, such as nuclear power, thermal power and other industrial sectors, but also used in the in the national economy important industrials, such as agricultural water pumps and living people pumps. [1-3]. Because of the interaction of the pump vane and rotor stator, the internal flow of centrifugal pump show the nonuniformity that is highly asymmetric in space and strongly unsteady in time, which lead to the increase of the pump loss, decrease of the efficiency, produce of the noise and vibration. In the traditional design process of the centrifugal pump, a successful design model of the centrifugal pump tends to be repeated several times. With the development of computer technology, the design of the centrifugal pump has changed from the traditional experience design to the design combined CFD (Computational Fluid Dynamics) transition design and experimental verification, which is a major innovation for the design of centrifugal pump. Numerical simulation has been widely used in analysis of impeller design and flow field. At present, there are a lot of literatures studied on the inner flow field of centrifugal pump. In most cases, the application of CFD technology in the design of the hydraulic model can effectively reflect the distribution of the field of the centrifugal pump. In this paper, the N-S equations and the standard k-εmodel based on two dimensional flow field, the centrifugal pump was simulated by FLUENT software, the velocity distribution, pressure distribution, the total pressure distribution, turbulent kinetic energy distribution and outlet velocity distribution map was analyzed, which has a certain reference significance for optimization and improvement of structure design of the centrifugal pump. 2 Control equation of CFD Model The fluid flow is controlled by the law of the physical conservation that includes the law of conservation of mass and the law of conservation of momentum. According to this law, incompressible Newtonian fluid continuity equation and momentum equation in absolute coordinate system are obtained. The continuity equation, ∂ U i = 0 ∂ x i （ 1） The momentum conservation equation,
Advanced Materials Research Vols. 926-930 (2014) pp 1743-1746 Online available since 2014/May/23 at © (2014) Trans Tech Publications, Switzerland doi:10.4028//AMR.926-930.1743
ij
Where, uiuj is the Reynolds stress tensor. Because the RANS equations is not closed, the k-ε model is chosen.
All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of TTP, . (ID: 59.72.86.214-04/09/14,13:28:14)
∂U i +பைடு நூலகம் ∂t
− u iu
j
∂U i 1 ∂p ∂ ∂U i 1 = − + (υ i − iu u ) ρ ∂xi ∂x j ρ i j ∂x j ∂x j
∂U ∂x
i j
（ 2） （ 3）
j
= υ t i(
+
∂U i ∂U i 2 ) − (k + υ t i ) iδ ∂ xi 3 ∂xi
ε
∂U i ∂U i ∂U i + )i ∂x j ∂xi ∂x j
3 Modeling and Analysis 3.1 Working principle of centrifugal pump Centrifugal pump is worked by the centrifugal force generated by the rotating impeller. Before the start, it is necessary for centrifugal pump to make the pump casing and suction tube filled with water and then starts the motor, which make the water and the pump shaft to rotation at the high speed. The water flow to the impeller outer edge and the volute pump shell by the action of centrifugal force. Because the vacuum is formed by the action of centrifugal force in the water pump impeller center place, the water in the suction tank is pressed into the pump casing constantly. Which achieve the goal of the water convey. The principle is shown in figure 1.
Simulation on the Flow Field of Centrifugal Pump Based on Fluent GUO An-fua, WANG Tongb, JIANG Ting-tingc, HU Yun-pingd ZHANG Da-jiange

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sw flow simulation使用简介及流体力学热力学基础

sw flow simulation使用简介及流体力学热力学基础


2014/12/13
QQ:95616233
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目 录
• 01 SW flow simulation使用简介 • 02 应用实例介绍 • 03 流体力学及传热学基本知识回顾
2014/12/13
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SW flow simulation 使用简介
• 计算流体动力学
计算流体动力学（computational fluid dynamics，CFD）是通过计算机数值计 算和图像显示，对包含有流体流动和热传导等相关物理现象的系统所做的分析。 基本思想：把原来在时间域及空间域上连续的物理量的场（速度场、压力场等）， 用一系列有限个离散点上的变量值的集合来代替，通过一定的原则和方式建立起关于 这些离散点上场变量之间关系的代数方程组，然后求解方程组获得场变量的近似值。 CFD可以看做是在流动基本方程（质量、动量、能量守恒方程）控制下对流动的数 值模拟，通过模拟，可以得到极其复杂问题的流场内各个位置上的基本物理量（速度、 压力、温度、浓度等）的分布，以及这些物理量随时间的变化情况，与CAD联合，还 可进行结构优化设计等。
2014/12/13
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SW flow simulation 使用简介
建立控制方程 建立初始条件及边界条件 划分网格，生成计算节点 建立离散方程 离散初始条件和边界条件 给定求解控制参数 求解离散方程 解收敛否 是 显示和输出计算结果
2014/12/13
CFD的求解过程
无论流动、传热、稳态、瞬态问题，求解过程都 可用左图表示。 控制方程参见第*页。初始条件与边界条件是控制 方程有确定解的前提，控制方程与相应的初始条件、 边界条件的组和构成对一个物理过程完整的数学描述。 初始与边界条件的处理，直接影响计算结果的精 度和时间。 CFD软件中，往往在前处理阶段完成网格划分后， 直接在边界上制定初始条件和边界条件，然后由前处 理软件自动将这些条件按离散的方式分配到相应的节 点上去。
振动特性外文

振动特性外文

The purpose of this work is to study the influence of the axial flow fan sweep on the downstream turbulent flow. The fans studied are three low-pressure and low-Mach-number axial flow fans, with respectively a radial, a forward and a backward sweep. Experimental and computational fluid dynamics (CFD) investigations are carried out on three fans, and the results are compared. The CFD method is a threedimensional (3D) Reynolds average Navier–Stokes (RANS) numerical simulation with the Reynolds stress model (RSM) as the turbulence model. It allows us to compute the Reynolds stress tensor components. Unsteady velocity measurements are carried out downstream of the fans with hot-wire anemometry. The values of the three velocity components of the flow and the six components of the Reynolds stress tensor obtained from experiments and simulations are compared. Overall performances are also measured to validate the design and fan simulation. It appears that a forward sweep decreases the radial component of the velocity whereas a backward sweep increases this component. Moreover, the sweep has a significant influence on the turbulent kinetic energy downstream of the fan. © 2010 Elsevier Ltd. All rights reserved.
一种新型导流式喷嘴的Fluent仿真分析

一种新型导流式喷嘴的Fluent仿真分析

一种新型导流式喷嘴的Fluent 仿真分析焦一航1，彭淑玲2，刘牧原1，郭峰1（1.青岛理工大学机械工程学院，山东青岛266520；2.烟台华顺机械工程设备有限公司，山东烟台264000）来稿日期：2018-09-07基金项目：教育部博士点基金（20133721110002）；教育部博士点专项基金（20133721120003）作者简介：焦一航，（1988-），男，山东烟台人，硕士研究生，主要研究方向：摩擦学；郭峰，（1968-），男，山东淄博人，博士研究生，博士生导师，教授，主要研究方向：油膜润滑的光学测量和理论分析工作1引言现代生产对机械装备工作条件的要求不断提高，因此对关键零部件的润滑方式提出了新的要求--环保、低能耗及高有效性，而油气润滑技术的出现及时的满足了这些要求[1]。

它不仅能够实现连续、微量、均匀供油，而且还克服了传统润滑方式（干油润滑、稀油润滑和油雾润滑）的种种不足，具有明显的技术优势和经济优势。

喷嘴作为油气润滑系统中末端关键部件，它的出口射流性能的优劣就将直接影响到机械最终的润滑效果，因此对喷嘴性能的研究就至关重要[2]。

目前针对喷嘴所做的研究主要集中在普通孔式喷嘴。

文献[3]通过试验研究了结构参数对喷嘴性能的影响，得到了喷嘴工作性能的最佳因素组合；文献[4]通过Ansys Fluent 对锥—柱型喷嘴进行了建模与仿真，得出了不同工况条件下选择喷嘴的主要依据；武汉理工大学的张友平根据公理设计原理，利用Ansys Fluent 分析了喷嘴特征参数对流体流动状态的影响[5]；文献[6]通过试验研究了喷嘴个数、长径比以及喷嘴到轴承球体的距离对轴承温升的影响；文献[7]基于喷嘴扩张角和瞬间流动的马赫数对喷嘴结构进行优化，从而使喷嘴获得更快的启动速度。

基于文献[8]设计的一种新型导流式喷嘴，运用Ansys Fluent 软件对喷嘴出口润滑油喷射形态及出口流速进行了仿真模拟计算，并通过与传统孔式喷嘴—针型喷嘴做对比，验证了新型导流式喷嘴在各方面上的优越性。

海底两万里中物理学的句子

海底两万里中物理学的句子

海底两万里中物理学的句子英文回答：Physics plays a significant role in Jules Verne's novel "Twenty Thousand Leagues Under the Sea." As the story follows the adventures of Professor Aronnax, Ned Land, and Conseil aboard the Nautilus, many instances highlight the application of physics principles.One example is the concept of buoyancy. The Nautilus, being a submarine, must maintain neutral buoyancy to navigate underwater. This is achieved by adjusting the amount of water in the ballast tanks. By controlling the density of the Nautilus, Captain Nemo ensures that the upward force exerted by the water equals the downward force of the submarine, allowing it to float at a desired depth. This demonstrates Archimedes' principle, which states that an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces.Another physics concept explored in the novel is pressure. As the Nautilus dives deeper into the ocean, the pressure increases significantly. The characters experience this firsthand when they descend to great depths and feel the pressure on their bodies. This aligns with Pascal's principle, which states that pressure is transmitted uniformly in all directions in a fluid. The immense pressure at great depths is a result of the weight of the water above pressing down on the submarine.Furthermore, the novel touches upon the principles of electricity and magnetism. The Nautilus is powered by electricity, and Verne describes the use of electric motors to propel the submarine through the water. The concept of electromagnetism is also evident in the use of magnetic fields to navigate and detect underwater objects. These applications of physics showcase the integration of scientific knowledge into the fictional world of the Nautilus.中文回答：物理学在朱尔·凡尔纳的小说《海底两万里》中起着重要的作用。