（毕业论文）汽车发动机冷却风扇计算机辅助设计研究.pdf

南京航空航天大学硕士学位论文
摘要
冷却风扇是汽车发动机冷却系统中非常重要的部件,然而在传统的冷却风扇设计流程中,
对风道试验的依赖较大,设计效率不高。随着计算机技术及计算流体力学的发展,使用计算机
辅助进行冷却风扇设计将是大势所趋。
本文按照设计步骤从风扇选型与匹配、风扇造型 CAD、风扇性能 CFD 三个方面分析了冷
却风扇计算机辅助设计的几个技术要点。在风扇选型与匹配的分析中,研究了风扇选型的总体
要求和风扇基本性能参数的确定,并且以一款 AUDI 风扇为例,论述了如何通过风扇与冷却系
统的匹配来评价风扇性能的优劣。在风扇造型 CAD 的分析过程中,本文将风扇主要造型参数
制作成风扇造型数据库,并研发出一套风扇造型开发系统,可实现风扇造型的二次开发。在随
后的风扇性能 CFD 的分析中,结合一款 F380 型风扇,分别使用两种湍流模型进行模拟性能计
算,并通过相似性原理及风扇试验两个方面进行了精度分析,最后得到了精度较高的模拟性能
数据。
通过以上研究工作的开展,本文得出使用计算机进行冷却风扇设计被证明是完全可以实现
的,而且不但设计效率高于传统流程,并且在精度上也有一定的保证。

关键词:发动机冷却风扇,计算机辅助设计,匹配,造型设计,性能计算

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汽车发动机冷却风扇计算机辅助设计研究
ABSTRACT
Cooling fan is an important part of engine cooling system, but traditional fan design depends on
plenty of experiments greatly, which results in low design efficiency. With the development of
puter putational fluid dynamics, puter to assist cooling fan design
es more and more popular.
According to actually design course, this article analyse several technology key points of cooling
puter aided design on fan selection and matching, fan shape CAD, fan performance CFD.
During the analyse of fan selection and matching, this article brought out main requirements of fan
selection and confirming of fan performance parameters, and an AUDI fan was used as a example to
explain how to estimate fan performance by its matching with engine cooling system. During
the analyse of fan shape CAD, this article applied several fan shape parameters to build a data base
and developed a software for fan shape’s second development. During the analyse of fan numerical
simulations, basing on F380 fan and two turbulent flow models, the numerical results pared
with the performance data of cooling fan with a high accuracy was achieved.
Finally, all the results show that puter to assist cooling fan design is possible, beside its
high efficiency, its accuracy is also acceptable.

Key words: engine cooling fan , computer aided design , matching , shape design , performance
com