Experimental and numerical study on aerodynamic noise of outdoor unit of room air conditioner with different grilles |
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| Authors: | Jie Tian Hua Ouyang Yadong Wu |
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| Affiliation: | 1. Istanbul Technical University, Dept. of Mechanical Eng., Istanbul, Turkey;2. The Pennsylvania State University, Dept. of Aerospace Eng., Turbomachinery Aero-Heat Lab., University Park, PA, USA;1. Institute of Turbomachinery, Xi''an Jiaotong University, Xi''an 710049, China;2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi''an 710049, China;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China;2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Division of Heat Transfer, Department of Energy Sciences, Lund University, Box 118, Lund SE-22 100, Sweden;4. School of Mechanical and Electrical Engineering, Nanchang University, China |
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| Abstract: | The aerodynamic and aeroacoustic performances of outdoor unit with two different types of grille have been investigated in present study. Experimental results indicate that the grille sharp will affect the flow rate and increase broadband noise level of outdoor unit. Based on noise generation mechanism and CFD simulation, vortex shedding noise model and inlet turbulence noise model are adopted to predict the broadband noise level of outdoor unit. When vortex shedding noise is concerned, the wake parameters should be calculated at 3 mm downstream of grille to achieve good accuracy. Inlet turbulence noise is generated from the interaction between blade wake and the grille, and plays less important role in present outdoor unit configuration. In comparison with experimental results, it is shown that the broadband noise prediction method could provide reasonable accuracy and the error between prediction and experiment is less than 1 dBA. |
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