有关冷却器外文翻译

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; PressurePlate 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 structureThe 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