瞄准国际包装 拓展蓝海市场——上海包装造纸(集团)有限公司参展德国杜塞尔多夫国际包装展

<正>上海包装造纸(集团)有限公司经过几十年一代又一代人的传承和努力,有一个共同的志向,希望融入国际市场,进一步增强集团的核心竞争力,让更多的企业走出国门看世界,让更多的产品销往世界各地。根据包装未来的发展战略规划,集团多方出击,积极开拓市场,经过跨年筹备,集团携软包装及纸包装企业首次跨入欧洲展会设摊参展,以体现集团拓展蓝海市场的决心。本次参展有别于以往作为装备采购商参观欧洲的     

2010年长江九江段洪水分析

2010年长江九江段先后发生两次超警戒洪水过程.本文通过对洪水成因分析,揭示长江流域暴雨洪水发生的区域、范围,不同流域洪水的发生与组合对长江九江段水位可能产生的影响.     

深井软岩巷道锚喷支护参数研究

针对深部开采的地质构造复杂、原岩应力高以及深井软岩巷道变形量大的特点,分析了软岩巷道围岩破坏原因和变形规律,初步掌握了巷道变形破坏的发展趋势,以加强控制关键部位及充分利用巷道围岩自稳能力为原则,提出了巷道支护设计方案,取得了良好的应用效果。     

空压站控制的应用实践

根据实际情况，分析了空压站现有运行状况，介绍了喘振的产生原因及克服方法。由此，确定了补充、完善数据检测及增加设备监测与故障诊断系统方案。实践证明，此方案具有数据采集及实时保护、在线监测预报、信号分析、故障诊断、记录等功能，为系统的检测维修提供了一定的依据。     

涡流桨搅拌槽内流动非稳定性的大涡模拟

The aim of this work is to investigate the flow instabilities in a baffled, stirred tank generated by a single Rushton turbine by means of large eddy simulation （LES）. The sliding mesh method was used for the coupling between the rotating and the stationary frame of references. The calculations were carried out on the ＂Shengcao-21C＂ supercomputer using a computational fluid dynamics （CFD） code CFX5. The flow fields predicted by the LES simulation and the simulation using standard κ-ε model were compared to the results from particle image velocimetry （PIV） measurements. It is shown that the CFD simulations using the LES approach and the standard κ-ε model agree well with the PIV measurements. Fluctuations of the radial and axial velocity are predicted at different frequencies by the LES simulation. Velocity fluctuations of high frequencies are seen in the impeller region, while low frequencies velocity fluctuations are observed in the bulk flow. A low frequency velocity fluctuation with a nondimensional frequency of 0.027Hz is predicted by the LES simulation, which agrees with experimental investigations in the literature. Flow circulation patterns predicted by the LES simulation are asymmetric, stochastic and complex, spanning a large portion of the tanks and varying with time, while circulation patterns calculated by the simulation using the standard κ-ε model are symmetric. The results of the present work give better understanding to the flow instabilities in the mechanically agitated tank. However, further analysis of the LES calculated velocity series by means of fast Fourier transform （FFT） and/or spectra analysis are recommended in future work in order to gain more knowledge of the complicated flow phenomena.