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大气污染物SO_x输送方程的尺度分析 被引量:6
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作者 程新金 黄美元 +4 位作者 安峻岭 王自发 徐华英 周玲 肖辉 《气象学报》 CSCD 北大核心 2002年第4期468-476,共9页
文中用量纲分析方法分析了控制大气污染物输送方程的动力学特性。提出了 6种反映大气污染物输送过程中各种动力、物理和化学过程相对重要性的动力学参数。并以硫氧化物为例进行了各参数量级大小分析 ,尤其对 3种起汇作用 (去除机理 )的... 文中用量纲分析方法分析了控制大气污染物输送方程的动力学特性。提出了 6种反映大气污染物输送过程中各种动力、物理和化学过程相对重要性的动力学参数。并以硫氧化物为例进行了各参数量级大小分析 ,尤其对 3种起汇作用 (去除机理 )的机理 (化学转化、干沉降和湿清除 )在不同尺度大气污染过程中的作用进行了详细分析。结果表明 :在一般情况下 ,SO2 的气相化学作用小于干沉降和湿清除的作用 ;干沉降作用很依赖于模式最底层厚度的选取 ;在有降雨时湿清除作用一般较大。文中还对大气污染物SOx 输送方程各项特征量的量级作了分析对比 ,得出了控制不同尺度大气污染物输送过程的零级近似方程和一级近似方程 。 展开更多
关键词 大气污染输送方程 量纲分析 动力学参数 起汇作用 硫化物 气相化学作用
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船舶人员聚集区空调送风模式的比较分析 被引量:9
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作者 安毓辉 《船舶工程》 CSCD 北大核心 2008年第5期69-72,共4页
对船舶人员聚集区空调送风的方式进行了比较和分析.根据实船设计的案例(南京长江油运公司7万吨级载重量原油/成品油船的会议室空调送风),通过采用计算流体动力学CFD(Computational Fluid Dynamics)的方法,对布风器送风和散流器两种送风... 对船舶人员聚集区空调送风的方式进行了比较和分析.根据实船设计的案例(南京长江油运公司7万吨级载重量原油/成品油船的会议室空调送风),通过采用计算流体动力学CFD(Computational Fluid Dynamics)的方法,对布风器送风和散流器两种送风方式下的会议室的温度和速度分布进行计算机模拟.通过对温度、风速、空气年龄和舒适度各项指标的比较分析,对该类处所的空调送风模式提出合理的建议. 展开更多
关键词 计算流体动力学 控制方程 输送方程 温度场 速度场 散流器 空气年龄 PMV PPD
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环境空气动力学
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《环境工程技术学报》 CAS 2003年第2期12-13,共2页
关键词 大气污染物 氮氧化物 汽车排气 城市小区 输送方程 污染扩散 污染物浓度 环境空气动力学 输送过程 气象条件
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Development of L-Type Fixation Equipment for Transporting Unit Modules
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作者 Kyoon-Tai Kim Young-Hun Jun 《Journal of Civil Engineering and Architecture》 2015年第12期1423-1431,共9页
The unit modular technique is one in which unit modules are prefabricated in a factory and then constructed at a construction site. That is why an important process, transport of unit module, is added in this techniqu... The unit modular technique is one in which unit modules are prefabricated in a factory and then constructed at a construction site. That is why an important process, transport of unit module, is added in this technique. However, it is not easy to transport a unit module that is high prefabrication ratio (prefab. ratio) (70-90%), since the walls and interior and exterior materials installed in it can become broken when the unit module is fixed using general fixation tools, including ropes and fixing belts. When the external wall, windows, etc. are damaged during the transportation, the efficiency of unit modular method is deteriorated. Taking this into account, the purpose of this study is to develop an improved fixation device that is convenient for fixing a unit module with a high prefab, ratio to a vehicle and securing the safety while running. The L-type adapter block proposed in this study was evaluated the structural safety through simulation method. The result of the simulation is that it seems desirable to set the working load of the L-type adapter block as 15 kN for Case 1 and 30 kN for Case 2. Therefore, when the L-type adapter block is utilized under the conditions in which the same load is applied as in Case 2, it is expected that safety will be improved. 展开更多
关键词 Unit modular technique modular construction fixation device safety.
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Mass Flow Prediction of the Coriolis Meter using C^0 Continuous Beam Elements
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作者 Binulal B R Akash Rajan +2 位作者 Abhilash Suryan R Jayaraj Kochupillai Heuy Dong Kim 《Journal of Thermal Science》 SCIE EI CAS CSCD 2015年第4期398-402,共5页
A three node C^0 continuous isoparametric beam element is formulated to model the curved pipe conveying fluid in three dimensional configuration.The equations of motion for the combined structure and fluid domain incl... A three node C^0 continuous isoparametric beam element is formulated to model the curved pipe conveying fluid in three dimensional configuration.The equations of motion for the combined structure and fluid domain including added mass effect,Coriolis effect,centrifugal effect and the effect of pressure on the walls of pipe have been developed by Paidoussis.This equation is converted to finite element formulation using Galerkin technique and is validated with the results available from literature. 展开更多
关键词 Coriolis mass flow meter Timoshenko beams finite element formulation Coriolis effect
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