Status and development trend of car radiator technology
1. the materials
Requirements from the thermal conductivity, auto radiator should have good thermal conductivity of materials from vibration and shock performance requirements, radiator material with light weight, mechanical strength and high welding strength characteristics of existing auto radiator materials include stainless steel, copper, aluminium Assembly of automotive brazed aluminum radiators and radiator.
2. the structure of the
Engine enhanced degree of improvement, very harsh demands on the radiator. Significant increase in engine heat load on the one hand, require radiator heat increases, on the other hand, highly compact cars and engines, while the volume of automobile radiator puts strict restrictions. In order to improve the auto radiator cooling efficiency in finite volume, design of the radiator core is very important. Most commonly used radiator core segment, louvered fin and tube-type.
3. processing technology
According to material of different, processing process experience has three a different of stage: stainless steel, and copper, and brass stage main used gas welding, and manual arc welding, and tungsten very hydrogen arc welding, method; aluminum Assembly stage main used tungsten very ammonia arc welding, melting very hydrogen arc welding; third a stage main using soldering welding of method, this is because soldering welding heating temperature low, welding speed fast, so welding stress small, welding fill process in the and not melting, so organization changes is small.
4. theoretical study
Automotive radiator cooling performance through mathematics is the main way to establish radiator heat transfer model, according to the Basic Law of heat transfer to the heatsink's cooling efficiency, heat transfer coefficient, water resistance, wind resistance, quantitative analysis of the heat transfer performance of the heat sink. At present, the domestic research on radiator models there is no groundbreaking progress, nor the appropriate standards are available. On the radiator heat transfer models are limited to specific heat fluid flow and heat transfer of the General heat, thermal design and strengthening work.
This is mainly because the radiator with the internal structure is very complex, by conventional mathematical method of heat transfer models are difficult to fully describe the radiator heat transfer mechanism. At present has some scholars have suggested that some radiators heat and theoretical analysis of flow resistance model. With shutters on the heat sink has cut off the heat sink air boundary layer development of boundary layer thickness, thinning, and enhance the role of heat sink performance, United States researchers on the internal flow structure, heat transfer and pressure drop characteristics of a systematic research, relevant theoretical models, facilitates the design and performance requirements of the radiator.