Numerical analysis for development of vehicle engine room cooling hood

차량 엔진룸 냉각용 후드 개발을 위한 수치해석

Abstract

This study deals with the numerical analysis for hood development to improve the cooling effect of the engine related components in engine room. Reducing the component temperature in engine room caused by a sudden temperature deviation can minimize the durability degradation of components. Therefore, in this study, numerical analysis for the development of the hood in engine room was carried out in four parts such as generator, battery, ECU and power steel oil which are relatively easy to control temperature among the main components in engine room. In order to verify the numerical analysis, experiments were conducted under the same conditions as those assumed in the numerical analysis.

본 연구는 자동차 엔진룸 내부에서 엔진과 연계된 부품의 냉각효과를 높이기 위해 후드 개발을 위한 수치해석을 다루고 있다. 급격한 온도편차에서 유발되는 엔진룸내 부품 온도를 저감시키면 부품에 대한 내구성 저하를 최소화 할 수 있다. 따라서, 본 연구에서는 차량 엔진룸 주요 부품 중에서도 온도제어가 비교적 용이한 발전기, 배터리, ECU 및 파워스틸 오일 등 4가지 부품을 목표로 엔진룸 냉각용 후드 개발을 위한 수치해석을 수행하였다. 그리고 수치해석을 검증하기 위하여 수치해석에서 가정하였던 동일한 조건으로 실험을 수행하여 비교하였다.

Fig. 1. Modeling area

Fig. 2. Modeling of components in engine room

Fig. 3. Modeling of air inlet and outlet in hood

Fig. 4. Modeling and reference coordinates of hood

Fig. 5. Boundary conditions

Fig. 6. Distribution of calculated cooling air velocity in engine room - 1^st model

Fig. 7. Distribution of calculated cooling air velocity and vector around generation - 1^st model

Fig. 8. Distribution of calculated cooling air velocity and vector around battery and ECU - 1^st model

Fig. 9. Distribution of cFig. 9. Distribution of calculated cooling air velocity and vector around power steering oil - 1^st modellculated cooling air velocity andvector around power steering oil - 1st model

Fig. 10. Distribution of air velocity in hood- 2^nd model

Fig. 11. Air streamline in hood- 2^nd model

Fig. 11. Hood manufactured for experiment

Fig. 12. Hood attached to vehicle

Fig. 13. Experimental apparatus

Fig. 14. Temperature of Components temperature in engine room

Table 1. Location and specifications of hood

Table 2. Heat generation in components

Table 3. Reduced temperature difference in components