| With the development of economy and improvement of people’s living standards,range hood has become a common household appliance.Noise,along with the increment of the air volume of range hood,has produced serious effect on people’s life.From this point,this paper aims at researching the aerodynamic noise characteristics of range hood and reducing its noise.The numerical simulation and experimental research are applied to the research of the internal flow field and aerodynamic noise of range hood.To complete the steady flow field calculation of range hood,the 3D model is established in Solidworks and mesh is generated in ANSYS ICEM.In this paper,flow field in range hood is measured by Particle Image Velocimetry(PIV)technology.The flow field of the measured sections is analyzed in details.The comparison of computational and measured values shows good agreement.In order to compute the aerodynamic noise of range hood,unsteady flow field calculation of range hood is completed in Fluent.Based on the Lighthill acoustic analogy theory,pressure fluctuation is transformed to acoustic source.The computation results of acoustic source in frequency domain,sound pressure coutours and the directivity of noise radiation are analyzed.Based on the theory of resonant muffler,the analysis is conducted about the effects of the perforation area ratio,the depth of the cavity and the perforation-aperture on its absorption characteristics.Perforated panel absorbers are designed and two kinds of sound absorbing materials are selected to enhance the noise reduction effects.The experimental results show that the noise reduction scheme can reduce the noise of range hood efectively.The achievements in this paper are important for the optimal design of range hood. |
