Influence of inlet turbulent condition on the formation mechanism of local scalar concentrations
Influence of inlet turbulent condition on the formation mechanism of local scalar concentrations
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DOI：
10.1002/2475-8876.12299
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发表时间：
2022-10
影响因子：
0.9
通讯作者：
Haruna Yamasawa;Teruaki Hirayama;Kazuki Kuga;Ryota Muta;Tomohiro Kobayashi;Kazuhide Ito
中科院分区：
文献类型：
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作者：
Haruna Yamasawa;Teruaki Hirayama;Kazuki Kuga;Ryota Muta;Tomohiro Kobayashi;Kazuhide Ito
在现有的通风设计中，通风率由时间平均流量定义，并且通常不考虑波动（湍流）分量。然而，入口湍流条件也被认为对污染物分布的形成有一些影响。因此，在讨论局部污染物浓度控制方面通过送风口的通风率设定值时，需要阐明入口边界处的湍流动能对室内环境中标量传输的影响。本研究讨论了通风设计中湍流动能对标量传递及其在封闭空间内分布的影响。为了了解各种入口湍流边界条件对标量传递的影响，使用两种不同的房间模型进行了计算流体动力学分析：一个简单的房间和一个具有产生大速度梯度的通风系统的房间。结果表明，房间内的标量传递不仅受入口边界处的平均速度输入的支配，而且还受到入口边界处的湍流条件的强烈影响。数值结果表明了同时考虑湍流成分和污染物转移的新通风设计策略的可能性。
In the existing ventilation design, the ventilation rate is defined by the time‐averaged flow rate, and the fluctuating (turbulence) component is not typically considered. However, inlet turbulent conditions are also assumed to have some influence on the formation of contaminant distributions. Therefore, the influence of turbulent kinetic energy at the inlet boundary on scalar transportation in an indoor environment needs to be elucidated when discussing the ventilation rate setpoint via the supply inlet in terms of local contaminant concentration control. This study discusses the impact of turbulent kinetic energy in the ventilation design on scalar transfer and its distribution within an enclosed space. To understand the influence of various inlet turbulent boundary conditions on scalar transfer, a computational fluid dynamics analysis was conducted using two different room models: a simple room and a room with a ventilation system that creates a large velocity gradient. The results indicate that scalar transfer within the room is not solely dominated by the averaged velocity input at the inlet boundary but is also strongly affected by the turbulence conditions at the inlet boundary. The numerical results indicate the possibility of a new ventilation design strategy that simultaneously considers the transfer of turbulent components and contaminants.