Through the research work of this article , it is shown that cfd technology can efficeintly instruct the design of indoor air distribution and evaluate indoor air quality and ventilating effect ; the distribution of heat sources have great impact on indoor air distribution ; under variable air volume condition , the indoor temperature and velocity fields are quite even and the thermo - environment is relatively good when using diffusers with coanda effect such as square diffuser and slot diffuser to supply air 经过本文研究发现,利用cfd技术可以有效地对空调室内气流组织设计进行指导,全面对室内空气品质和通风效果进行评价。热源分布对于空调室内的气流组织具有极其重大的影响。在变风量条件下,利用具有良好贴附效应的送风口如方型散流器和条缝风口送风,空调室内的温度场和速度场较均匀,室内的热环境良好。
In this article , simulations of air distribution in the vav air - conditioned office are carried out in the cases of different air - supplying diffusers including slot diffuser , sqaure grille , bar grille and square diffuser to supply air , the standard three - dimensional k - ? two - equation turbulence model with correctional item of buoyancy effect and simple algorithm are adopted , and wall function method is used to handle boundary conditions 本文采用经过浮升力项修正的-两方程模型和simple算法,应用壁面函数法处理边界条件,对利用包括条缝风口、方型百叶风口、长条型百叶风口和方型散流器不同型式送风口送风的变风量空调房间内的气流组织进行了模拟。
Productive durability test and oxygen transfer performance test in clean water per diffuser for seven kinds of diffusers were studied respectively in this paper , and serving diffusive area , air flow , varied resistance , varied resistance after stopping air flow , diffusive strength were also investigated in the productive testing period 摘要对7种曝气器产品分别进行了单盘耐用性生产试验、单盘清水充氧性能试验以及对在大生产试验期间的服务面积、供气量、阻力变化、停气后阻力变化、曝气强度等方面进行了测试对比工作。
Standard lamp and diffusers are very important calibration elements , in chapter three , first uv and vuv radiometric standard for calibration are introduced . then the fabrication and characteristics of baso4 diffuser and alminium diffuser are researched , the baso4 diffuser ' s hemispheric reflectance and bi - directional reflectance distribution function were measured and compared with lambtian surface , and the deviation from that of lambtian surface is given . in the experiment , al diffuser ' s brdf is researched , obtain the change of spectral characteristic of al diffuser , compare al diffuser ' s brdf before and after coated with al + mgf2 , and different al diffusers with different surface roughness 铝漫反射板作为一个漫反射光学元件安装在太阳紫外光谱监视器的入射狭缝前,太阳紫外光谱监视器在轨测量时,太阳辐射入射到铝漫反射板后进入入射狭缝,光谱辐照度的角度是变化的,本章测量了铝漫反射的相对双向反射分布函数,研究了镀膜( al + mgf _ 2 )前后光谱反射率的变化,漫反射的光谱特性及漫反射板表面粗糙度对相对双向反射分布函数的影响,使得测量数据反演成为可能。