基于CFD仿真的车载空气净化器气动噪声的优化与设计

Optimization and Design of Aerodynamic Noise of Vehicle Air Purifier Based on CFD Simulation

车载空气净化器在开发阶段中,离心风机以4000 rpm转速运行时,整机存在明显的气动噪声,音质体验不能接受;针对该技术问题,本文通过气动噪声理论分析以及CFD仿真技术等方法,确定了电器盒与风机的相对位置是造成气动噪声的主要原因。同时也是基于CFD仿真分析对电器盒的形态结构进行优化计,使电器盒的边缘弧形形状能够适应风机的流场,达到噪声优化的目的。试验结果表明,经过优化设计后,整机的声功率级降低1.5 dB,峰值降低8.6 dB,气动噪声改善明显。所提供的噪声优化方法对车载空气净化器以及类似结构的产品具有可靠的实用性。

During the development stage of the vehicle air purifier,when the centrifugal fan runs at a speed of 4000 rpm,the whole machine has obvious aerodynamic noise and the sound quality experience cannot be acceptable.For this technical problem,this article is analyzed by pneumatic noise theory analysis,and CFD simulation technology.The method of determining the relative position of the electrical box and the fan is the main cause of pneumatic noise.At the same time,it is also based on the CFD simulation analysis to optimize the morphological structure of the electrical box,so that the edge arc shape of the electrical box can adapt to the flow field of the fan and achieve the purpose of noise optimization.The test results show that after the optimized design,the sound power level of the whole machine decreases by 1.5 dB,the peak value is reduced by 8.6 dB,and the pneumatic noise improves significantly.The provided noise optimization method has reliable practicality for vehicle air purifiers and products similar to structures.