摘要
噪声问题是呼吸机技术研发需要克服的重要环节。我们前期研究结果表明由德国emb-papst公司生产的一款专门用于持续气道正压(CPAP)呼吸机的压力发生器蜗壳部分有局部回流现象,叶轮部分流场速度出现局部不均匀,叶轮进口处存在局部负压,易导致噪声产生。本文在前期研究的基础上,利用专业的计算流体动力学(CFD)软件FLUENT,采用稳态雷诺平均纳维斯托克斯(RANS)的噪声源稳态求解,即结合Lilley方程以及合成湍流(Synthetic turbulence)的方法得到压力发生器内的速度波动,用这一特性来定性对压力发生器进行噪声预估。结果表明压力发生器叶轮进口处、蜗壳进口处、叶片边缘的交界面、蜗舌拐角处都存在不同程度的噪声源,在一定程度上影响整机性能,结构设计上有待改进。
It is important to overcome the problem of noise for the research and development of ventilator technolo- gies. Previous research of this subject showed that the pressure generator,produced by German EMB-PAPST Com- pany and specially used for continuous positive airway pressure（CPAP） ventilator, created noise easily, due to local backflow in the volute, uneven velocity distribution in the impeller and local negative pressure in the inlet of the im- peller. Based on the previous research, a combination of the computational fluid dynamics （CFD） software FLUENT and steady-state solution of noise source of Reynolds-Averaged Navier-Stokes （RANS） was used in this study. We combined equation of Lilley and Synthetic Turbulence to get the information about speed fluctuation of the pressure generator, which is used to finish noise prediction. After detailed analysis, it showed that noise source of different degrees spreaded around the inlet of the impeller and the volute, interface of blade edge and corner of the volute tongue, which influenced its overall performance to certain extent. Therefore, its structural design needs to be im- proved.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2013年第2期312-315,共4页
Journal of Biomedical Engineering
基金
国家自然科学基金资助项目(50976071)
关键词
噪声
计算流体动力学
持续气道正压呼吸机
压力发生器
噪声预估
Noise
Computational fluid dynamics （CFD）
Continuous positive airway pressure （CPAP） ventilator
Pressure generator
Noise prediction
