汽车冷却风扇旋转环流场优化研究

Research on Optimization of Rotating Circulation Field of Automotive Cooling Fan

货运卡车在长途运输过程中,风扇作为发动机热管理系统中最重要的部分,散热往往需要消耗过多功耗,存在效率低功耗大的问题。以通用型风扇Z-490为原型,研究工况为3500r/min时的风扇性能,建立三维模型,模拟出冷却风扇有无旋转环的流场情况,为了进一步降低叶尖间隙带来的不利影响,需要选取合适的旋转环,采用正交试验法,以叶尖间距、投影宽度及角度为三个水平因素,选取同一流量下的风扇效率与流量值作为风扇性能的评价指标。结果表明,优化后的旋转环尺寸改善了叶尖涡旋气流产生的不利影响,提高了效率与静压值,为风扇的设计提供参考依据。

As the most important part of the engine thermal management system in the long-distance transportation of freight trucks,the fan often needs to consume too much power for heat dissipation,and there is a problem of low efficiency and large power consumption.This paper takes the general purpose fan Z-490 as the prototype,studies the performance of the fan when the working condition is 3500r/min,and establishes a three-dimensional model.The flow field of cooling fan with or without rotating ring is simulated.In order to further reduce the adverse effects caused by blade tip gap,orthogonal test method is adopted,taking blade tip spacing,projection width and Angle as three horizontal factors,and fan efficiency and flow value under the same flow rate is selected as the evaluation index of fan performance.The results show that the optimized rotating ring size can improve the adverse effect of tip vortex flow,improve the efficiency and static pressure value,and it provides a reference for the design of the fan.