空调室内机噪声数值模拟及实验研究

发布时间：2018-04-01 09:19

本文选题：空调室内机　切入点：贯流式风机　出处：《青岛理工大学》2014年硕士论文

【摘要】：壁挂式空调室内机的噪声问题逐渐成为企业和消费者关注的热点，，开展空调室内机风道流场优化和降噪研究具有重要的现实意义。本文针对壁挂式空调室内机噪声较大的现状，对空调室内机的流场和噪声进行了数值模拟和实验研究。利用CFD数值模拟软件对空调室内机风道流场进行模拟。在模型的建立过程中，贯流式风机的动静区域采用多重参考系（MRF）模型，把换热器处理为多孔介质加管束的结构，并通过实验验证了假设的合理性。模拟室内机采用不等距叶轮时的流场分布，探讨不等距叶轮对流场的影响。模拟不同形式的换热器下空调室内机的流场分布，分析不同形式的换热器对室内机流场的影响。结合FW-H方程对室内机的噪声进行模拟，确定室内机的主要噪声源为叶轮处的偶极子声源。模拟两种不等距叶轮下的室内机噪声，随着叶轮分布不均性增加，室内机的噪声得到降低。测量空调室内机的进出口风速和噪声值，并将实验结果与模拟结果进行对比分析，证明了数值模型的合理性。研究表明，室内机的涡旋位于蜗舌附近，采用不等距叶轮能够降低空调室内机的噪声，但不利于流场的稳定性。采用弧形换热器可以减小涡旋，优化室内机的流场。通过对空调室内机的流场及噪声的数值模拟和实验研究，为室内机的流场优化和降噪提供了理论参考。
[Abstract]:The noise problem of indoor unit of wall mounted air conditioning has gradually become the focus of attention of enterprises and consumers. It is of great practical significance to study the optimization of air flow field and noise reduction of indoor air channel of indoor air conditioning system. This paper aims at the present situation of large noise in indoor unit of wall mounted air conditioning system. Numerical simulation and experimental study on flow field and noise of indoor air conditioning unit are carried out. CFD numerical simulation software is used to simulate the flow field of the air channel in the indoor air conditioning unit. In the process of establishing the model, the dynamic and static region of the tubular fan is modeled by the multiple reference system (MRF) model, and the heat exchanger is treated as the structure of porous medium and tube bundle. The rationality of the hypothesis is verified by experiments. The flow field distribution in the chamber is simulated when the impeller is not equidistant, and the influence of the flow field on the flow field of the impeller is discussed. The flow field distribution of the indoor air conditioning unit under different heat exchangers is simulated. The influence of different heat exchangers on the flow field of indoor unit is analyzed. The main noise source of indoor unit is determined to be dipole sound source at impeller with FW-H equation, and the indoor noise is simulated under two different impellers. With the increase of the uneven distribution of the impeller, the noise of the indoor unit is reduced, the wind speed and noise value of the indoor unit are measured, and the experimental results are compared with the simulation results, and the rationality of the numerical model is proved. The results show that the vortex of the indoor unit is located near the cochlear tongue, and the noise of the indoor unit can be reduced by using the non-equidistant impeller, but it is not conducive to the stability of the flow field, and the vortex can be reduced by using the arc heat exchanger. Through the numerical simulation and experimental study of the flow field and noise of the indoor unit of air conditioning, the theoretical reference is provided for the optimization and noise reduction of the flow field of the indoor unit.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657.2;TB53

【引证文献】