Effects of expanding zone parameters of vacuum dust suction mouth on flow simulation results

Based on the parametric analysis of the expanding zone of the vacuum dust suction mouth,the flow in the vacuum dust suction mouth was simulated by computational fluid dynamics(CFD)software,Fluent.The effects of the expanding zone parameters on flow simulation were analyzed.The results show that simulation effects depend on threshold values of the expanding zone parameters of the dust suction mouth,and the threshold values of the expanding zone can be obtained according to the different structures of the vacuum dust suction mouth and be selected as the geometric parameters in calculating,and also corners of the expanding zone make unobvious difference in calculation accuracy and in computational efficiency compared with no corner.The simulation results provide practical guidance to the flow simulation on the dust suction mouth.

泰国技术官员统治的兴衰简述

从20世纪60年代到90年代,泰国经济持续快速发展,人们常将此归因于技术专家官员,他们虽然政治影响力微弱,但专业技能强大,这从他们的执政发展历程可见一斑。20世纪50年代出现的第一批技术官员大多在欧洲接受过教育;到了“美国时代”,更多技术官员在美国接受教育,他们认为政府的作用应是稳定汇率,平衡预算,为资本运行提供安全、自由的环境;1975年之后,技术官员们必须应对更复杂的环境——来自内部的政治冲突以及外部冲击,同时,由于拥有技能优势,以及国际机构的强力支持,他们掌握的权力越来越大;到了20世纪80年代中期,泰国步入繁荣时期,技术官员对政策的控制力开始减弱;1997年金融危机后,他们因未能适应国内、国际经济的变化,受到来自各方的指责。