椭圆管换热器对空调室内机声场影响的数值模拟
Numerical Simulation of the Influence of Elliptical Tube Heat Exchanger in Indoor Unit of Air Conditioner on its Acoustic Field

椭圆管换热器由于其良好的流动和换热特性，在换热设备中有着广泛的应用。本文利用计算流体力学方法，对椭圆管翅片换热器应用于空调室内机的流场和声场进行数值模拟，并与圆管作对比。计算结果表明，换热管形状对贯流风机内部偏心涡的形成位置和大小没有影响；与采用相同截面积的圆管翅片换热器的室内机相比，相同条件下，采用椭圆管换热器对于室内机增加风量，改善制冷性能，降低噪声尤其是低频噪声方面有着良好的效果。其中，长短轴之比为2的椭圆管可以降低室内机噪声4 dB。
Elliptical tube heat exchanger has been widely used in heat exchange equipment due to its good flow and heat transfer characteristics. In this paper we use computational fluid dynamics method to simulate the flow field and sound field generated by the indoor unit of air conditioner with elliptical finned tube heat exchanger , and make comparison with circular tube heat exchanger. The results show that for the inside the cross-flow, the structure of tubes in heat exchangers has no effect on the location and size of the eccentric vortex; compared with the circular tube finned heat exchanger with the same cross-sectional area, the air conditioners using elliptical tubes work better on increasing the air volume, improving cooling effect and reducing noise especially low-frequency noise under the same conditions. Above all, the conditioner using elliptical tubes in which the ratio of the long axis and short axis is 2.0 can reduce noise 4 dB