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Modeling of Complex Air Diffuser for CFD Simulation

用于 CFD 仿真的复杂空气扩散器建模

基本信息

批准号：
15360313
负责人：
KONDO Yasushi
金额：
$ 3.46万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360313/
关键词：
Computational Fluid Dynamics High Diffusive Air Diffuser Swirl Type Floor-mounted Air Diffuser Prescribed Velocity Method Full-scale Experiment Unstructured Fine Grid CFD Transient CFD 非構造格子系CFD解析高拡散型天井吹出口低温送風空調方式床吹出空調方式室内温熱・空気環境

项目摘要

The cold air supply system, in which temperature difference between the supply and the return air is higher than usual system, has been applied to the office buildings. The cold air supply system has been mainly studied by experiments and field measurements. Few CFD simulations was applied to that system because it was difficult to reproduced the complex air flow around the air diffuser in the CFD. However the P.V.Method can simulate the airflow around the air diffuser with coarse grids system. In the previous paper, it was reported that CFD simulation using P.V.method showed good agreement with experimental results for Ceiling Air Diffuser.In this research, CFD using the unstructured grid system were conducted to obtain airflow data around the high diffusion type ceiling air diffuser as boundary conditions of coarse grid CFD. In addition, the coarse grid CFD with P.V.method using the airflow data around the diffuser was compared to the result of the unstructured CFD simulations under … More the isothermal condition. The result of the coarse grid CFD with P.V.method showed good agreement with the one simulated using unstructured grid system. The local Archimedes number is very small at virtual box surfaces and the isothermal airflow data can be applied to the non-isothermal simulation as the boundary condition. Furthermore, the measurements were carried out under the non-isothermal condition in the test room and compared to the non-isothermal coarse grid CFD using P.V.method with the isothermal air flow data around the diffuser.The under floor air conditioning system has been applied many office buildings in Japan. When the under floor air conditioning system is installed in office rooms, the occupied area can be effectively controlled in comfortable condition. The vertical temperature difference in the under floor supply system is much larger then in general ceiling supply system. Therefore the control method of the under floor system is important and the position of thermal sensors should be determined carefully. The air distribution in the room installed with the under floor system are studied by the experiment and CFD. The steady states of room temperature are examined and thermal stratification in the room is observed with both the experiment and CFD. Thus, the transient condition is investigated with the CFD in which the heat capacity of walls and floors materials etc is included. The results of the transient CFD are compared with the experimental results. Less

冷风送风系统采用了送风与回风温差大于常规送风系统的冷风送风系统。冷风送风系统主要通过实验和现场测量进行研究。由于在CFD中难以再现空气扩散器周围复杂的气流，因此很少对该系统进行CFD模拟。而pv法可以模拟粗网格系统下空气扩散器周围的气流。在之前的文章中，已经报道了采用pv方法的CFD模拟结果与实验结果吻合较好。本研究采用非结构化网格系统进行CFD，获取高扩散型天花板空气扩散器周围的气流数据，作为粗网格CFD的边界条件。此外，将采用扩压器周围气流数据的粗糙网格CFD与非结构化CFD在等温条件下的模拟结果进行了比较。用pv法计算的粗网格CFD结果与用非结构化网格系统模拟的结果吻合较好。虚拟箱形表面的局部阿基米德数很小，等温气流数据可以作为边界条件应用于非等温模拟。此外，在试验室非等温条件下进行了测量，并利用扩散器周围的等温气流数据与采用pv法的非等温粗网格CFD进行了对比。地板下空调系统在日本的许多办公建筑中得到了应用。办公用房安装地板下空调系统，可有效地将占用面积控制在舒适状态。地板下送风系统的垂直温差比一般吊顶送风系统大得多。因此，地板下系统的控制方法是重要的，热传感器的位置应仔细确定。采用实验和CFD方法对安装了地板下系统的房间的气流组织进行了研究。采用实验方法和CFD方法研究了室内温度的稳态，并观察了室内的热分层现象。因此，采用CFD方法研究了考虑墙体、地板等材料热容量的瞬态工况。将瞬态CFD计算结果与实验结果进行了比较。少