For the flow noise at the elbow of air conditioning and ventilation system components,with the flow noise at the outlet of the duct taken as the reserch object,the influence of the flow guide sheet arranged inside the elbow of the ventilation duct over the internal flow field and the outlet flow noise is studied based on the finite element method,and the action law of the shape and number parameters of the flow guide sheet is explored.The results show that the flow noise at the outlet of the duct is caused by the vortex and pressure pulsation generated by the turbulent flow in the duct,and the addition of straight deflectors will increase the outlet flow noise,while the curved deflectors can play a role in stabilizing the flow,which reduces the vortex structure and size of the wall,the pulsation pressure intensity,and the sound pressure level of the outlet flow noise.The more the number of curved deflectors increases,the more obviously the sound pressure level of flow noise at the outlet decreases.
关键词
空调器/导流片/弯头/漩涡/湍流/流噪声
Key words
air conditioner/deflector sheet/elbow/vortex/turbulence/flow noise
维普
万方数据