NUMERICAL SIMULATION OF TIP-CLEARANCE FLOW IN CASCADE

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｉｐ ｃｌｅａｒａｎｃｅｆｌｏｗｓｏｃｃｕｒｉｎｖａｒｉｏｕｓｅｎｇｉｎｅｅｒ ｉｎｇａｐｐｌｉｃａｔｉｏｎｓｓｕｃｈａｓａｘｉａｌ ｆｌｏｗ ｐｕｍｐｓａｎｄｄｕｃｔ ｅｄｐｒｏｐｅｌｌｅｒｓ .Ｔｈｅｉｎｅｒｔｉａｌｆｏｒｃｅｓａｃｔｉｎｇｕｐｏｎｔｈｅｆｌｕｉｄｉｎｔｈｅｎａｒｒｏｗ ｇａｐｂｅｔｗｅｅｎｂｌａｄｅｔｉｐａｎｄｔｈｅｓｕｒｒｏｕｎｄｉｎｇｗａｌｌａｒｅｓｕｆｆｉｃｉｅｎｔｔｏ ｇｅｎｅｒａｔｅａｔｉｐｌｅａｋａｇｅｖｏｒｔｅｘｏｎｔｈｅｓｕｃｔｉｏｎｓ…     

浅析市政工程项目管理中的质量控制

当前,“工程项目管理”作为一种先进的管理模式在工程施工中被广泛采用。一些市政工程施工单位在施工管理中也积极推广应用了“工程项目管理”,并取得了一定的经济效益和社会效益,但在具体操作中还存在一些问题,本文就市政工程项目管理中的质量控制谈几点认识。     

Community discovery method with uncertainty measure of overlappingnodes based on topological potential

Community discovery of complex networks,esp.of social networks,has been a hotly debated topic in academic circles in recent years.Since actual networks usually contain some overlapping nodes that are d...     

机身导轨烧伤原因与十字头的修复

空压机十字头按十字头体与滑履的连接方式分为整体式与分开式两种。整体十字头虽然结构较轻巧,制造方便,但磨损后不能调正与机身导轨间的间隙,给机器修理带来了困难。近年来,我厂先后承修了几台2Z—3/8—1型无油润滑立式空压机,其十字头为铸铁制成的整体式,配用圆柱形浮动十字头销。几年来我们常遇到机身导轨烧伤以及伴随而来的整体十字头的修复问题,为此我们进行了一些探讨,取得了一定的效果。     

便携式多参数智能表面粗糙度测试仪的研制

本文介绍了 ZCY-A 型便携式多参数智能表面粗糙度测试仪的测量原理,提出了单片机进行表面粗糙度测试的数据处理方法。给出了各参数的数学模型、核心电路的硬件结构及软件流程。并分析了该仪器与国外同类仪器的对比结果。     

High Efficient Technology of Steelmaking With Low Silicon Hot Metal on Large Converter

 To resolve the difficulty in slag formation during steelmaking with low silicon hot metal and to increase productivity, a new 5 hole lance was developed by increasing oxygen flow from 50 000 m3/h to 60 000 m3/h. Synthetic slag was added to adjust the slag composition. The problems such as difficulty in dephosphorization and slag adhesion to oxygen lance and hood were settled. Steel production and metal yield were increased and the nozzle life was prolonged through these techniques.     

传感器实验教学改革的探讨

传感器是一门实践性很强的学科,学生通过实验除能验证理论知识外,还能加强创新和实践能力的培养.针对我校传感器实验教学的现状做一些有益的改革,旨在提高学生的动手能力,培养创新型人才.     

北方土石山区坡林地水土流失防治对策

坡林地是北方土石山区水土流失的主要策源地之一,坡林地水土流失治理也是当前北方土石山区水土保持工作的薄弱环节.在分析坡林地水土流失危害和总结水土流失防治面临问题的基础上,提出了5种技术对策和3项管理对策,为今后坡林地水土流失防治提供参考.     

Influence of Mn Content and Hot Deformation on Transformation Behavior of CMn Steels

The hot deformation behaviors and the microstructural evolution of plain CMn steels with similar contents of C and Si but different contents of Mn have been investigated by compressive processing using Gleeble1500 mechanical simulator. Influence of Mn and hot deformation on continuous cooling transformation of steels has been studied. The experimental results showed that deformation in austenite region accelerated transformation process, and the extent is dependent on the hot deformation and cooling conditions. The hot deformation would promote transformation process, but the increase of transformation temperature is dependent on Mn contents. The results have also shown that the effect of deformation on ferrite transformation becomes more obvious with the increase of Mn content at relatively low cooling rate.