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采用Fluent软件对不同PTC布置角度下的空调室内机的内流特征进行了2维大涡数值模拟,探讨了PTC布置方位对贯流风叶的进气干扰规律,得到了合理的方位角度。在此基础上,进一步研究了由于PTC布置角度的差异而导致贯流风叶所发出的噪声频谱的变化规律。优化后的布置方案可有效减少涡流和气流的分离,减弱位于50 Hz与380 Hz附近的嗡嗡异声。PTC合理的布置方位为PTC法线方向与重力方向夹角为10°,偏向底座一侧。同时对所研究的PTC布置方案进行了风量与噪声测试。试验结果与数值模拟结论相吻合,表明优化后的PTC安装位置是合理的,可有效改善空调器的声质量和气动性能。
Fluent software was used to simulate the flow characteristics of indoor air-conditioners under different PTC layout angles. The two-dimensional large-eddy numerical simulation was carried out. The interference of PTC placement azimuth on the inlet of the cross-flow fan blades was discussed and a reasonable azimuth angle was obtained. On this basis, the variation rule of the noise spectrum emitted by the cross-flow fan blades is further studied due to the difference of PTC arrangement angles. The optimized layout effectively reduces turbulence and airflow separation, dampening buzz at 50 Hz and 380 Hz. PTC reasonable layout orientation for the PTC normal direction and the direction of gravity angle of 10 °, the side of the base bias. At the same time, the air flow and noise of the PTC layout scheme studied were tested. The experimental results are consistent with the numerical simulation results, which shows that the optimized PTC installation location is reasonable and can effectively improve the sound quality and aerodynamic performance of the air conditioner.