外文翻译-汽车散热器性能.doc

1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目：Automotive Radiator Performance 汽车散热器性能 学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日Automotive Radiator Performance Abstract Automotive engine cooling system takes care of excess heat produced during engine operation. It regulates engine surface temperature for eng

2、ine optimum efficiency. Recent advancement in engine for power forced engine cooling system to develop new strategies to improve its performance efficiency. Also to reduce fuel consumption along with controlling engine emission to mitigate environmental pollution norms. This paper throws light on pa

3、rameters which influence radiator performance along with reviews some of the conventional and modern approaches to enhance radiator performance. Index TermsAutomotive engine cooling system, Performance, RadiatorI. INTRODUCTION Automotive engine cooling system takes care of excess heat produced durin

4、g engine operation. It regulates engine surface temperature for engine optimum efficiency. Most automotive engine cooling systems consist of the radiator, water pump, cooling fan, pressure cap and thermostat. Radiator is the prime component of the system.Radiator is a heat exchanger that removes hea

5、t from engine coolant passing through it. Heat is transferred from hot coolant to outside air. Radiator assembly consists of three main parts core, inlet tank and outlet tank. Core has two sets of passage, a set of tubes and a set of fins. Coolant flows through tubes and air flows between fins. The

6、hot coolant sends heat through tubes to fins. Outside air passing between fins pickups and carries away heat.Manuscript received February, 2013. Pawan S. Amrutkar, Department of Mechanical Engineering, Sinhgad Academy of Engineering, University of Pune, India. Sangram R. Patil, Department of Mechani

7、cal Engineering, Sinhgad Academy of Engineering, University of Pune, India.Performance of engine cooling system is influenced by factors like air and coolant mass flow rate, air inlet temperature, coolant fluid, fin type, fin pitch, tube type and tube pitch etc. While designing cooling system three

8、worst conditions considered based on above parameters. High altitude : At high altitude, air density becomes low and hence affects air mass flow rate. Summer conditions : During summer surrounding air is hot i.e. air inlet temperature is more. Maximum power : Engine condition producing maximum power

9、 like when vehicle is climbing uphill, maximum heat rejection is required during this condition. To compensate all these factors radiator core size required may be large.II. LITERATURE REVIEW C. Oliet, A. Oliva, J. Castro, C.D. studied different factors which influence radiator performance. It inclu

10、des air and coolant flow, fin density and air inlet temperature. It is observed that heat transfer and performance of radiator strongly affected by air and coolant mass flow rate. As air and coolant flow increases cooling capacity also increases. When air inlet temperature increases, heat transfer a

11、nd thus cooling capacity decreases. Smaller fin spacing and higher louver fin angle have higher heat transfer. Fin density can be increased till it blocks the air flow and heat transfer rate decreases. JP Yadav and Bharat Raj Singh in their studies also presented parametric study on automotive radia

12、tor. In the performance evaluation, a radiator is installed into a test setup. The various parameters including mass flow rate of coolant, inlet coolant temperature; etc. are varied. Following remarks are observed during study : Influence of coolant mass flow cooling capacity of the radiator has dir

13、ect relation with the coolant flow rate. With an increase in the value of cooling flow rate, there is corresponding increase in the value of the effectiveness and cooling capacity. Influence of coolant inlet temperature with the increase in the inlet temperature of the coolant the cooling capacity o

14、f the radiator increases. Mazen Al-Amayreh in his study, tested the thermal conductivities of ethylene glycol + water, diethylene glycol + water and triethylene glycol + water mixtures, measured attemperatures ranging from 25C to 40C and concentrations ranging from 25 wt. % glycol to 75 wt.% glycol.

15、 Increasing the concentration of glycol leads to decrease of thermal conductivity. Increasing the temperature of mixture resulted in slight increase in thermal conductivity. The various techniques are used to enhance the performance of automotive engine cooling system. It may be either conventional or modern approach. Conventional approach relies on fin, tube and fan design optimization. Modern techniques are based on new technologies like nano-technology, heat load averaging capacity or actuator based engine cooling system. This paper reviews som