| 摘要: |
| 采用数值模拟与实验研究相结合的方法，以R134a为工质，研究了微通道平行流蒸发器内入口处分流板的开孔面积变化时，对蒸发器的流动和换热性能的影响。研究结果表明：随着分流板上的开孔孔径增大，蒸发器内的流动阻力会降低，制冷剂流量分配的均匀性变差，而制冷量却先增加后减小。分流板的开孔孔径存在一个最佳值，此时蒸发器内的阻力损失低，制冷剂的流量分配均匀性好，两者的匹配性最好，使得蒸发器的制冷量达到最大。此蒸发器中入口分流板的最佳开孔面积约为150.7mm2。 |
| 关键词: 微通道蒸发器 分流板 开孔面积 对流换热 |
| DOI： |
|
|
| 基金项目:国家自然科学基金（10972106）资助项目。 |
|
| Effects of Open Area of Holes in Deflector on Performance of Micro-channel Evaporator with Parallel Flow |
| Liu Wei,Zhu Chunling |
| (China Electronics Technology Group Corporation No.38 Research Institute;Nanjing University of Aeronautics and Astronautics) |
| Abstract: |
| The numerical simulation and experimental methods were used to study the efficiency of flow distribution and pressure drop of the micro-channel evaporators with parallel flow. R134a was as the working fluid. The results show that: with the same deflector structure, as the open area of holes in the deflector increased, the pressure drop of the evaporator decreased, while the flow distribution uniformity of refrigerant deteriorated, but the cooling capacity of evaporator is first increased and then decreased. There is an optimum open area of holes in deflector to the micro-channel evaporator with parallel flow, then the pressure drop and flow distribution uniformity get to the best matching, lead to the cooling capacity being the max. For the micro-channel evaporator with parallel flow type, the optimum open area of holes in the first deflector is about 150.7mm2. |
| Key words: micro-channel evaporator deflector open area of holes convective heat transfer |
