CAJ | 학술논문

针对车用百叶窗翅片式散热器的传热和流阻特性,采用数值模拟计算方法对百叶窗对称布置和非对称布置2种方式的散热器进行了研究分析,通过计算百叶窗翅片空气侧的传热量、传热因子和压降,以及散热器综合性能评价因子,获得了综合性能较优的百叶窗布置形式.结果表明,在相同的进出口边界和给定的几何参数条件下,对称布置的百叶窗翅片具有较高的传热性能,但流阻性能较差.当空气入口速度为5.58,m/s 时,与非对称形式相比,对称布置时的传热量提高了14.7%,压降却增加了29.3%;在不同的空气入口速度条件下,对称布置时百叶窗翅片具有较高的散热器综合性能评价因子,因此,百叶窗对称布置时散热器综合性能较好.
침대차용백협창시편식산열기적전열화류조특성,채용수치모의계산방법대백협창대칭포치화비대칭포치2충방식적산열기진행료연구분석,통과계산백협창시편공기측적전열량、전열인자화압강,이급산열기종합성능평개인자,획득료종합성능교우적백협창포치형식.결과표명,재상동적진출구변계화급정적궤하삼수조건하,대칭포치적백협창시편구유교고적전열성능,단류조성능교차.당공기입구속도위5.58,m/s 시,여비대칭형식상비,대칭포치시적전열량제고료14.7%,압강각증가료29.3%;재불동적공기입구속도조건하,대칭포치시백협창시편구유교고적산열기종합성능평개인자,인차,백협창대칭포치시산열기종합성능교호.
Numerical simulation investigation and analysis of heat transfer and flow resistance performance over lou-vered fins in automotive heat exchangers were presented. Three-dimensional simulations on the air-side were per-formed for two types of louvered fin configurations i. e. symmetrical arrangement and asymmetrical arrangement. Calculated results reflected by air-side heat transfer rate,heat transfer factor and pressure drop,along with compre-hensive evaluation factor,indicated that a symmetrical arrangement of louvered fins provided an increase in heat transfer performance and also an increase in pressure drop compared with the asymmetrical arrangement of louvered fins under the same inlet and outlet boundary conditions for the given geometrical parameters. At the air frontal veloc-ity of 5.58,m/s,the heat exchangers with symmetrical arrangement of louver provided a 14.7% increase in heat trans-fer rate but also a 29.3% increase in pressure drop compared with the asymmetrical arrangement of louver. And for different air frontal velocities,the comprehensive evaluation factor for symmetrical arrangement of louvered fins are higher than that of the asymmetrical arrangement.The results indicate that the overall performance is better for heat exchangers with symmetrical arrangement of louver.