자동차용 오일쿨러의 압력유동 및 방열성능 해석

Automobile power steering system consists of pump, gear box and fluid line where working oil flows. Recently, the increased temperature of engine room and power steering working oil due to the larger size and additional faculty of automobile has caused early aging of hose and seal parts, leaking of oil, and change of steering efforts. So, oil cooler of steering system becomes necessary to control oil temperature and to stabilize steering condition. In domestic, many development of fin type oil cooler is underway. But a few researches have been studied about heat exchange performance design for air and oil pressure loss. To design oil cooler it is important to calculate heat exchange rate and pressure drop of air side precisely. This paper presents technology of tin type oil cooler design from concept to faculty using computational fluid dynamics (F.V.M). It is difficult to analyze heat promoter performance on oil flow and fin effect on air flow numerically. But we could finally find the influence of heat promoter on working oil and heat exchange performance of oil cooler by sensitivity analysis of fin and promoter shape and roughness. As a result, it becomes possible to design oil cooler according to automobile size, which helps good power steering system design.