有关冷却器外文翻译.docx

本科生毕业设计外文翻译 题 目：机油冷却器内部压力分布研究 学生姓名：赵欣 学 号：1264134136 专 业：过程装备与控制工程 班 级：装备12-1班 指导教师：孟智慧Study on Pressure Distribution in Oil CoolerAbstract: The CFD method was applied and strip-fins were simplified as porous media as well A new way to determine friction coefficient in porous media was presented，and a mathematical model concerning input pressure，number of heat exchanger layers and input velocity was derived，which can be utilized to predict the pressure in oil coolerKeywords: Oil cooler; Porous media; Pressure Plate fin oil cooler (oil cooler) is a typical compact heat exchanger, has high heat transfer efficiency, small volume, light weight, the advantages of shape design and installation position of the free, widely used in automobile, engineering machinery and other oil cooling of the engine. The needle to plate fin heat exchanger the heat transfer performance and resistance characteristics of a long time, scholars at home and abroad in a wide range of research, W M Kays and a l London of experiments based on the proposed heat exchanger core flow pressure drop calculation formula of the heat transfer and flow resistance of 90 kinds of fin design according to the number of 1; PAJ M manglik and Arthur e bergles put forward the expression of heat resistance factor J and factor f rectangular serrated fin, further study of the Reynolds number and fin size effects on the resistance characteristics of 2; e carluccio, G starace and other application number Numerical simulation technique is used to simplify the fin to the porous medium, and the thermal fluid dynamic characteristics of the oil side and the air side of the vehicle oil cooler are analyzed and studied.Lihua us, Jiangping Chen et al through physical experiments of 36 species of different sizes of serrated fin, using regression analysis method to obtain the relation between the oil side high pressure direction (HPD) heat transfer and pressure drop characteristics 4; Zhang Yi using CFD /nht method conducts the research to the oil cooler oil flow and heat transfer problems, including import and export oil position on the oil cooler oil side of the pressure effect 5; Guo Lihua, with the help of software of AN-SYS /fluent. Analysis of oil cooler, a core layer flow field and temperature field distribution 6. Oil cooler internal pressure distribution of oil in the core of each layer of the cooling flow state and distribution of decision, thus affecting the oil cooler of the overall heat transfer performance. In addition, the partial pressure of too high to cause the working life of the oil cooler reduced. Therefore, oil cooler internal oil side of the pressure distribution were studied, and to guide the oil cooler for thermal properties and local structure strength design and oil cooling device test parameters adjustment and virtual test rig a construction has important significance. At present, the heat exchanger fluid flow in the core of some scholars mostly along the width direction of the core dynamic unfolding. As for plate fin oil cooler, oil usually arranged at both ends of the oil cooler, oil inlet pipe first by diffusion flow to each layer of the heat exchanger, along the width to fully open after the contraction flow in the pipe. In addition, oil cooler is a closed entity with complex structure, including multilayer cooling core and a large number of fins, and the flow law of oil complex. If the physical test method, high investment cost, long cycle, and it is difficult to explore the internal pressure distribution. In order to effectively characterize the flow state of oil in the oil cooler, with computational fluid dynamics (CFD) technology, the author will fin area is simplified as porous media model, and proposes a method for determining the resistance coefficient of porous medium model. Through the analysis of oil flow distribution are not uniform in every layer, core into, exit and internal pressure, the establishment of the internal pressure of the oil cooler on the inlet pressure, mathematical model of core layers, inlet velocity and other factors. In the inlet pressure and the velocity is known, oil cooler internal pressure on the size of the forecast.1. Serrated fin structure The oil cooling device internal fin area simplified as porous media model, the use of computational fluid dynamics (CFD) technology, on the oil cooler internal oil flow state simulation analysis, can effectively learn the oil cooler internal pressure condition. Simulation results show that: in oil pressure distribution showed a V type, into the circuit at the end of the end under the maximum pressure value; core cooling in the pressure drop and oil inlet velocity, core layers I showed a quadratic variation; back to the oil pressure distribution can be determined by the outlet pressure of the cooling core. According to the simulation results of push derived oil cooler internal pressure formula can be used to predict in the inlet pressure and velocity is known and test conditions that determine the conditions, the oil cooling device internal into the circuit, each layer of core and oil pressure size, to change the thermal performance and reliability design basis for the improvement of oil coolers for. 2. The pressure distribution inside the oil core According to the application process of the collaborative manufacturing of collaborative manufacturing platform design scheme of manufacturing grid, resource service layer from the traditional grid architecture extracted as the resource node collaborative environment of service interface, and the design of the terminal resource collaborative environment, so as to achieve the resources to support hot deployment, do not need to restart is the implementation of the service, you can add new resources, and providing services. And the application prototype of the whole collaborative platform is built, and the modeling, the modulation degree, the management of manufacturing process and the resource management of the manufacturing grid are realized. The next step work is of platform and make further improvement and verification, will eventually platforms deployed in the region oriented application service system support to area of SMT product manufacturing collaboration, improve the competitive ability of the enterprise in the manufacturing, to achieve rapid response to the market.机油冷却器内部压力分布研究摘要: 运用计算流体力学 ( CFD) 技术，将机油冷却器翅片区域简化为多孔介质模型，研究在机油流动分配不均匀的 条件下机油冷却器内部压力分布情况，提出一种确定多孔介质模型中阻力系数的方法以及表征油冷器内部压力关于进口压力、芯子层数、进口流速等因素的数学模型，实现了油冷器内部压力大小的预测。关键词: 油冷器;多孔介质;压力板翅式机油冷却器 ( 简称油冷器)是一种典型的紧凑式换热器，具有传热效率高、体积小、质量轻、形状设计及安装位置自由等优点，广泛应用于汽车、工程机械等发动机中的机油冷却。针对板翅式换热器的传热性能和阻力特性，长期以来国内外学者进行了广泛的研究，W M KAYS 和 A L LONDON 基于大量的实验研究，提出了换热器芯子的流动压力降计算公式以及 90 多种翅片的传热与流动阻力的设计数据; Paj M MANGLIK 和 Arthur E BERGLES 提出了矩形锯齿型翅片的换热因子 j 和阻力因子f 的表达式，进一步研究了雷诺数和翅片尺寸对阻力特性的影响; E CARLUCCIO， G STARACE 等运用数值模拟技术，将翅片简化为多孔介质，分析研究了车用油冷器的油侧和空气侧的热 流体动力特性; Lihua Guo，Jiangping Chen 等通过对36 种不同尺寸的锯齿型翅片的物理实验，运用回归分析方法获得油侧高压力方向( HPD)传热和阻力特性的关联式; 张毅利用 CFD /NHT 方法对油冷器中的机油流动与传热问题进行研究，其中包括进出油口位置对油冷器油侧压力的影响; 郭丽华等借助 AN-SYS /Fluent 软件，分析研究油冷器各层芯子的流场和温度场分布情况。 油冷器内部的压力分布决定机油在各层冷却芯子中的流动状态与分配情况，从而影响油冷器的总体换热性能。此外，局部压力过高易造成油冷器工作寿命的降低。因此，对油冷器内部油侧压力分布情况进行研究，对于指导油冷器换热性能和局部结构强度的改 进设计、油冷器试验参数的调整以及虚拟试验台的创建等具有重要意义。 目前，许多学者所研究的换热器芯子中流体的流动多为沿芯子宽度方向完全展开。而对于板翅式机油冷却器，进、出油管通常布置在油冷器的两端，机油首先由进油管扩散流动于每层换热器芯子，沿宽度方向完全展开后收缩流动于出油管。此外，油