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泥沙云团运动特性对初始投放条件的响应研究
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作者 班浩扬 蒋茗韬 陈维 《泥沙研究》 CAS CSCD 北大核心 2024年第2期33-40,共8页
基于CFD-DEM耦合方法并依据沙水同轴射流实验建立泥沙云团水下运动模型,研究0.25 mm、0.50 mm和0.75 mm等3种粒径泥沙云团的水下运动特性,以及水沙中心速度对圆形、同轴环形、正方形和三角形等4种形状投放口的响应情况。研究结果表明:... 基于CFD-DEM耦合方法并依据沙水同轴射流实验建立泥沙云团水下运动模型,研究0.25 mm、0.50 mm和0.75 mm等3种粒径泥沙云团的水下运动特性,以及水沙中心速度对圆形、同轴环形、正方形和三角形等4种形状投放口的响应情况。研究结果表明:抛投泥沙入水后形成的泥沙云团由泥沙相为主的球形前锋和以液相为主的云团尾部组成,触底后云团的几何形态表现为稳态的泥沙射流;云团运动初始阶段水流截面形状与投放口形状保持一致,在沉降过程中逐步扩展并转化为圆形,云团沉降扩散过程中的运动形态与泥沙颗粒的粒径直接相关;投放口形状对云团中心速度的影响范围约为等面积圆形投放口内径的7倍,在此区域内非圆形截面投放口投放的泥沙云团中心速度快,但速度衰减率高。 展开更多
关键词 水下抛泥 泥沙云团 泥沙粒径 投放口截面形状 运动特性
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浅谈垃圾被服物流传输系统设置及安装技术在医院项目中的应用 被引量:3
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作者 杨军 刘波 +2 位作者 韩东升 曹灵玲 杨鹏琳 《安装》 2021年第4期27-30,共4页
本文基于四川大学华西天府医院项目垃圾被服物流传输系统的应用,详细阐述了医院物流传输系统的运行原理、主要设备组成及安装过程中的注意事项,旨在推动医院物流传输技术良性发展,促进医院后勤保障水平的提升。
关键词 垃圾被服 物流传输 投放口
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Projection pursuit model of vehicle emission on air pollution at intersections based on the improved bat algorithm
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作者 Hu Qizhou Deng Wei +1 位作者 Tan Minjia Bian Lishuang 《Journal of Southeast University(English Edition)》 EI CAS 2019年第3期389-392,共4页
The projection pursuit model is used to study the assessment of air pollution caused by vehicle emissions at intersections. Based on the analysis of the characteristics and regularities of vehicle emissions at interse... The projection pursuit model is used to study the assessment of air pollution caused by vehicle emissions at intersections. Based on the analysis of the characteristics and regularities of vehicle emissions at intersections, a vehicle emission model based on projection pursuit is established, and the bat algorithm is used to solve the optimization function. The research results show that the projection pursuit model can not only measure the air pollution of vehicle emissions at intersections, but also effectively evaluate the level of vehicle exhaust emissions at intersections. Taking the air pollution caused by vehicle emissions at intersections as the research object and considering the influence factors of vehicle emissions on air pollution comprehensively, the evaluation index system of vehicle emissions at intersections on air pollution is constructed. Based on large data analysis, a prediction model of air pollution caused by vehicle emissions at intersections is constructed, and an improved bat algorithm is used to realize the assessment process. The application results show that the prediction model of vehicle emissions at intersections can define the degree of air pollution caused by vehicle emissions, and it has good guiding significance and practical value for solving the problem of air pollution caused by vehicle emissions. 展开更多
关键词 INTERSECTION vehicle emission POLLUTANTS projection pursuit bat algorithm
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