空调室外机送风能力提升和性能优化的研究

Research on air supply capability enhancement and performance optimization of air conditioner outdoor unit

本文采用CFD仿真的方法分析了室外机轴流风扇风场特性,根据轴流风扇尾缘处出风角设计了格栅叶片的进风角β1,并研究了β1变化对整机送风发散角和送风距离的影响特性,确定了格栅的优化方案。通过制作手板件优化格栅,并采用烟雾测试法观察整机的送风特性。试验表明采用新格栅时整机送风发散角明显减小,送风距离由现行格栅的3m提高到5m及以上。模拟厂外某工程室外机的实际安装空间和安装方案,测试了狭小空间内整机的制冷能力。采用新格栅时,在标准制冷工况下,整机能力较现行格栅提升77%,室内机出风温度较现行格栅降低5℃;在制冷过负荷条件下,整机能力较现行格栅提升88%,室内机出风温度较现行格栅降低2℃。

In this paper,the characteristics of outdoor unit axial-flow fan wind field was analyzed by CFD simulation. The inlet angle β1 of grill blade was designed according to the outlet angle at the trailing edge of axial-flow fan. The influence of the change of β1 on the divergence angle and the distance of supply air was studied,and the optimization scheme of grill was determined. The mock-up was fabricated for the optimized grill, and the air supply characteristics of the whole machine were observed by smoke test method. The test results showed that the divergence angle of the whole machine was obviously reduced and the air supply distance was increased from 3 m to more than 5 m when the new grill was used. Simulating the actual installation space and installation scheme of an outdoor machine in a project outside the plant,the refrigeration capacity of the whole machine in a narrow space was tested. When the new grill was used,the capacity of the whole machine was increased by 77% under the standard refrigeration condition, and the indoor air temperature was reduced by 5℃. Under the condition of refrigeration overload, the capacity of the whole machine was increased by 88%,and the indoor temperature was reduced by 2℃.