摘要
飞机座舱内的个I生送风系统通过给乘客呼吸区直接提供新鲜空气,为乘客创造舒适的周边微环境。然而个性送风对座舱内流场和污染物传播的影响尚不明晰。本文通过计算流体力学(CFD)的方法研究了真实客机座舱内部分个性送风喷口开启情况下的气流组织和气态污染物传播规律。研究采用Re-NormalizationGroupk-c(R_NGk-c)湍流模型近似求解Navier-Stokes方程。模拟结果显示:从个性送风口及条缝送风口送出的射流交汇并形成了左右两个环流,在环流中心暖体假人产生的热羽流与射流相互作用形成滞留区;当污染源位于个性送风喷口下方时,强射流促进了污染物在舱内空间的稀释,乘客呼吸区的通风效率高于污染源远离个性送风口的情况。另外,座舱内主流区存在从前向后的纵向气流,致使污染物向后传播;CS7(污染源前排)的呼吸区通风效率比cSl1(污染源后排)高13-158倍。
In aircraft cabins, gaspers are applied to improve the local thermal comfort of passengers by providing conditioned fresh air to the breathing zone. However, the role of the gaspers is less clear for air distribution and contaminant transport in the cabins. In order to investigate the airflow pattern and contaminant transportation when turning on gaspers, airflow and gaseous contaminant distributions in a five-row aircraft cabin with 2/5 gaspers on are simulated by Computational Fluid Dynamics(CFD). All the thermal-fluid boundaries are measured and input into ANSYS Fluent. Re-Normalization Group k-ε(RNG k-ε) model is adopted to approximate the Navier-Stokes equations. Results obtained show that the airflow pattern in the cabin is interacted by the jet from air diffusers and gaspers and the thermal plume from manikins. When the contaminant source is under the opened gasper, the gasper would prevent the contaminant transport for the high jet blew the contaminant down to the floor. The ventilation efficiency in the breathing zone is higher when the contaminant source is under the opened gasper than that with the source under the closed gasper. In addition, the contaminant spread backward in breathing zone, due to the longitude flow caused by air diffusers and gaspers. The ventilation efficiency at CS7(in front of the source section) is 13~158 times higher than that at CS11(behind the source section).
出处
《应用力学学报》
CAS
CSCD
北大核心
2015年第4期586-592,704,共7页
Chinese Journal of Applied Mechanics
基金
国家重点基础研究发展计划(973计划)资助项目(2012CB720100)
关键词
计算流体力学
客机座舱
个性送风
气流组织
污染物传播
CFD,aircraft cabin,personalized ventilation,air distribution,contaminant transportation