title: [The numerical simulation of the internal flow field inside the pressure generator of a continuous positive airway pressure ventilator].
abstract: The problem of noise in ventilator has always been an important topic to study in the development of the ventilator. A great number of data are showing that there are still large gaps of research and application levels in noise control of the ventilator between China and some more advanced foreign countries. In this study, with cooperation of the Shanghai Medical Equipment Limited Liability Company, we used the computational fluid dynamics (CFD), software FLUENT, adopted the standard k-epsilon turbulence model and the SIMPLE algorithm to simulate the inner flow field of the continuous positive airway pressure (CPAP) ventilator's pressure generator. After a detailed analysis, we figured out that there are several deficiencies in this ventilator, like local reflow in volute, uneven velocity distribution and local negative pressure in inlet of the impeller, which easily lead to noise and affect the ventilator's performances. So, it needs to be improved to a certain extent.
authors.affiliation: University of Shanghai for Science and Technology, Shanghai 200093, China. y_z_cheng@yahoo.com.cn
authors.forename: Yunzhang
authors.initials: Y
authors.lastname: Cheng
authors.forename: Lihua
authors.initials: L
authors.lastname: Zhu
authors.forename: Weiguo
authors.initials: W
authors.lastname: Zhang
authors.forename: Wenquan
authors.initials: W
authors.lastname: Wu
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D045422:Continuous Positive Airway Pressure / Q000009:adverse effects / Q000295:instrumentation*; D004867:Equipment Design / Q000379:methods; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control*