It puts forward that inverted breaststroke and inverted crawl in synchronization may help beginners to master the way of change breath very conveniently.
本文通过对比实验,指出掌握水中换气方法是学习蛙泳技术及其他泳姿动作的关键,提出同步的反蛙泳和仰泳练习,可以使初学者快捷地学会蛙泳的换气动作。
For evaluating the degree to which the supply air can remove indoor contaminants,gives an introduction to the concepts of the age of air,air exchange efficiency,ventilation efficiency,etc.
就空调送风气流组织排除室内污染物能力的评价,介绍了北欧及英国学者采用拉格朗日法提出的空气龄、换气效率、排污效率等概念,详细推导了示踪气体浓度与局部平均空气龄的关系,阐述了换气效率与排污效率的关系。
The computation is done with Fluent soft and the evaluation index data that contains age of air, air exchange efficiency and recovery time etc are picked up and processed.
将实验与数值模拟相结合,根据实验数据修正数学模型,利用Fluent软件进行计算,重点对空气龄、换气效率、自净时间等评价指标进行了提取和处理,对两种气流组织方式的实验数据及计算结果进行了分析比较。
The k-ε turbulence model was applied for numerical simulation of indoor fluid flow and age of air,and the air exchange efficiency was obtained.
笔者以YW25G型空调硬卧列车车厢为研究对象,在物理模型中考虑了旅客以及车厢内各障碍物(包括边桌、行李架、床铺、折座)等对流场的影响,采用k-ε湍流模型及数值模拟的方法,对硬卧车厢内流场及空气龄的分布变化规律进行研究,从而得到车厢内的换气效率。
The effect of interval ventilation time on quality of `Dongzao' jujube during hypobaric storage at low temperature was studied.
045MPa条件下,换气周期对冬枣贮藏品质的影响。