Improved inhaled air quality at reduced ventilation rate by control of airflow interaction at the breathing zone with lobed jets
Improved inhaled air quality at reduced ventilation rate by control of airflow interaction at the breathing zone with lobed jets
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DOI：
10.1080/10789669.2013.864919
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发表时间：
2014-02-17
期刊：
影响因子：
--
通讯作者：
Meslem, Amina
中科院分区：
文献类型：
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作者：
Bolashikov, Zhecho;Melikov, Arsen;Meslem, Amina
通过使用叶状喷嘴作为个性化通气 (PV) 的一部分来控制人呼吸区的气流相互作用，研究了清洁空气供应减少时的吸入空气质量。实验是在 23 摄氏度（73.4 华氏度）的全尺寸测试室中进行的，工作站上坐着一个呼吸热模型，身体周围有真实的自由对流和正常的呼吸周期。房间内的空气中混有示踪气体R134a。清洁空气从三个喷嘴等温供应，喷嘴具有圆形、四叶三叶草和六边星形开口，等效直径为 0.025m（0.08ft）。喷嘴位于边界层内的正面，并以嘴为中心。研究了通过改变初始速度（0.2-0.6m/s，0.66-1.97 fps）和距嘴的距离（0.02-0.06m，0.07-0.20 ft）来增强吸入空气质量。对插入射流和自由对流之间的相互作用的控制是有效的。吸入时测量到超过 80% 的清洁光伏空气。性能最差的喷嘴是四叶草喷嘴：其最佳性能在最短距离和最高速度下吸入了 23% 的清洁空气。另一种波瓣喷嘴，即六棱星形喷嘴，其性能与圆形喷嘴类似。
Inhaled air quality at a reduced supply of clean air was studied by controlling the airflow interaction at the breathing zone of a person using lobed jets as part of personalized ventilation (PV). Experiments were performed in a full-scale test room at 23 degrees C (73.4 degrees F) with a breathing thermal manikin seated at a workstation, with realistic free-convection flow around the body and a normal breathing cycle. The air in the room was mixed with tracer gas R134a. Clean air was supplied isothermally from three nozzles with circular, four-leafed clover, and six-edged star openings of 0.025m (0.08 ft) equivalent diameter. The nozzles were positioned frontally at the face within the boundary layer and centered to the mouth. The enhancement of inhaled air quality by changing the initial velocity (0.2-0.6m/s, 0.66-1.97 fps) and the distance from the mouth (0.02-0.06m, 0.07-0.20 ft) was studied. The control over the interaction between the inserted jets and the free convection flow was efficient. Over 80% clean PV air was measured in inhalation. The worst performing nozzle was the four-leafed clover: its best performance yielded 23% clean air inhalation, at the shortest distance and the highest velocity. The other lobed nozzle, the six-edged star, performed similarly to the circular nozzle.