轴流换热风扇性能测试与数值模拟研究

发布时间：2018-06-15 04:47

本文选题：轴流换热风扇 + 风管性能试验　；参考：《上海交通大学》2014年硕士论文

【摘要】：与大型商场、车间和家用空调相比，由于换热量不同，小型办公场所配置的室外机轴流换热风扇需要专门设计。这一类的换热风扇风量要求在5300~6600m3/h，通常摆放在距工作生活区略远的室外位置，流量和全压是其换热性能的重要评判标准。针对某企业对轴流风扇性能的要求，论文对三个产品分别进行了细致的性能研究。首先在室外机产品上采用三孔探针测试了风扇出口流动，进而改装了风管性能试验台，测试了不同转速下风扇性能，得到了无量纲风扇性能数据，同时测试了风管内风扇前后速度分布，与原产品测试数据进行了对比。为了进一步研究风扇叶片流道内的流动机构，本文采用UG建模软件中建立了风扇实体模型以供数值模拟计算，同时对流场不同进出口长度进行了分析，，得到了恰当的风扇流场模型，进行风扇内部流场分析。数值计算与实验测试数据对比分析，首先说明了数值计算结果的可靠性，发现风扇叶顶分离涡对风扇性能和计算结果有很大的影响，说明叶顶间隙对叶顶分离涡尺度有直接影响，进而影响风扇整体性能。为了增强通风换热效果，本文研究了叶片安装角度增大5o后性能，数值计算和实验测试均表明新风扇的性能达到了性能改进的目标。
[Abstract]:Compared with large shopping malls, workshops and domestic air conditioners, small office space equipped with outdoor axial flow heat exchange fans need to be specially designed because of the different heat transfer. This kind of heat exchange fan requires air volume at 5300,6600m3 / h and is usually placed outside the living area slightly away from the living area. Flow rate and total pressure are the important criteria for evaluating the heat transfer performance of the fan. According to the requirements of an enterprise for the performance of axial fan, three products are studied in detail in this paper. First of all, the flow of fan outlet was tested with a three-hole probe on the outdoor unit, and then the air duct performance test rig was modified. The fan performance data were obtained under different rotating speeds. At the same time, the velocity distribution of the fan in the air duct was measured and compared with the test data of the original product. In order to further study the flow mechanism in the flow channel of fan blade, the solid model of fan is established by UG software for numerical simulation. At the same time, the flow field with different inlet and outlet length is analyzed. An appropriate fan flow field model is obtained and the flow field inside the fan is analyzed. Compared with the experimental data, the reliability of the numerical results is demonstrated. It is found that the separation vortex at the top of the fan blade has a great influence on the fan performance and the calculated results. The results show that the tip clearance has a direct effect on the blade tip separation vortex scale, and then affects the overall performance of the fan. In order to enhance the heat transfer effect of ventilation, the performance of the new fan is studied after the blade mounting angle is increased by 5 o. The results of numerical calculation and experimental test show that the performance of the new fan has reached the goal of performance improvement.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657.2

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