分体式空调室内机出风口流场及凝露机理研究与控制

Study and Control of Outlet Trend Flow Field and Condensation Mechanism of Split Air Conditioner Indoor Unit

空调器作为调节室内温度必备电器,性能可靠性尤其重要。售后调研发现出风口四周边沿凝结水滴的凝露问题,成为突出故障。而凝露现象与室内机出风口位置内部流场密切关联。文中基于计算流体动力学(CFD)技术和康达效应,建立了不同出风结构如上、下沿尖角增加过渡圆角、凸面、凹面的组合方案。进行流速和压力、空气涡流效果数字模型计算、仿真与优化。计算结果表明,优化后的方案均衡了冷热空气混合位置压力和风速分布,避免了冷热空气出现空气涡流与聚集情况。经GB/T 7725-2004《房间空气调节器》“凝露试验”、舒适性试验验证,最易凝露工况最高风档运行4 h,出风口周围上、下沿与面板没有水珠凝露聚集,送风轨迹高度分布理想,制热、制不会导致客户“头热脚冷”的舒适性问题。并结合结构优化、数值仿真与试验验证,对室内机风口上、下沿垂直过渡结构的局部结构完善企业标准,确保凝露功能设计效率与质量。

As an essential appliance for adjusting indoor temperature,the performance reliability of air conditioner is particularly important.After-sales research found that the condensation problem of condensed water droplets around the air outlet has become a prominent fault.The condensation phenomenon is closely related to the flow of the internal flow field at the air outlet of the indoor unit.Based on the principle of computational fluid dynamics (CFD) technology and Coanda effect to improve the interface flow velocity,a combination scheme of adding transition rounded convex and concave surfaces along the upper and lower sharp corners of different air outlet structures was established.Numerical model calculation and simulation of flow velocity and pressure,air vortex effect improvement were carried out.The numerical results showed that the optimized scheme balances the distribution of pressure and wind speed at the mixing position of cold and hot air,and avoids the occurrence of air vortex and aggregation of hot and cold air.It had been verified by the “condensation test” and comfort test of GB/T 7725-2004 “Room Air Conditioner”,and the highest wind speed in the most condensing condition was operated for 4 hours,and there was no condensation on the upper and lower edges of the panel around the air outlet.The height distribution of the air supply trajectory was ideal,and the heating and heating will not cause the comfort problem of “hot head and cold feet” for customers.Combined with structural optimization,numerical simulation and experimental verification,the local structure of the indoor airway and under the vertical transition structure were improved,ensured the efficiency and quality of the condensation function.