汽车暖通空调气动噪声仿真

为研究汽车暖通空调气动噪声特性,以某车型汽车暖通空调为研究对象,通过风阻试验对滤清器和蒸发器进行等效处理,建立仿真模型;基于流体动力学和气动声学理论,结合宽频带噪声源模型和FW-H模型,预测声源分布和噪声特性;将仿真结果与试验结果进行对标验证,出风口风量最大误差为6.7%,最小为2.1%,噪声频谱特性具有较高的一致性。结果表明,Curle噪声源主要分布在鼓风机和空调箱壁面,近场以旋转噪声为主,远场宽频噪声占主导。可适当通过减小叶片与空气接触面积、增加叶片数量、调整蜗舍角度和间隙、增加导流装置等措施降低暖通空调工作时产生的噪声,为汽车暖通空调前期开发提供一种研究方法。

Aerodynamic Noise Simulation of Automobile Heating Ventilation Air Conditioner

To investigate the aerodynamic noise characteristics of automobile heating ventilation air conditioner, taking an automobile heating ventilation air conditioner system as the research object, the simulation model is established based on the equivalent treatment for Filter and Evaporator by the windage resistance test. Applying hydrodynamics and aeroacoustics theory, combined with Broadband noise source model and FW-H model, the noise source distribution and characteristics are predicted. Comparing the simulation results with the test results, the comparison shows that the maximum error of the air volume at the outlet is 6.7% while the minimum is 2.1%, and the spectrum characteristics of noise are highly consistent. The results show that Curle noise sources are mainly distributed on the wall of blower and air conditioning box, and the near field is dominated by rotating noise while the far field is dominated by broadband noise. The noise can be reduced by reducing the contact area between blades and air, increasing the number of blades, adjusting the angle and clearance of cochleae, and adding diversion devices and it provides a research method for the early development of automobile heating ventilation air conditioner.