WNT-8000新一代综合调度自动化系统(二)前置系统

着重介绍了ＷＮＴ－８０００综合调度自动化系统前置机系统具有的容量大、结构简单、可靠性高、维护方便及界面友好等特点，以及其基于ＷｉｎｄｏｗｓＮＴ操作系统平台，采用面向对象的程序设计方法和选用多种智能设备集成的设计思想，为在通用平台上建立前置系统提供了成功的经验。     

精铰挤光复合铰刀在气缸盖加工中的应用

介绍了一种精铰挤光复合铰刀，它可以一次完成三个工序的工作，从而达到提高加工精度，节省劳动时间和操作工人的目的。     

交流特高压输电线路空气间隙的选择

为适应我国交流特高压输电工程建设的需要,研究影响线路安全运行和造价的空气间隙取值,具有重要意义。采用基于我国超高压电网运行经验证实科学合理的绝缘配合原则与方法,研究论证了我国ACUHV输电线路空气间隙的建议值。对于操作过电压间隙,在我国首次采用与特高压电网实际长波头操作冲击电压相适应的放电电压的特性数据通过绝缘配合的统计法来选取。利用该方法,经过计算获得线路每操作1次线路上多个间隙中至少有1个闪络的次数(风险率),并考查其是否满足预期值来选择间隙距离。经研究对塔头尺寸起决定作用的塔窗中V型绝缘子串操作过电压要求的空气间隙,在海拔高度500、1000和1500m时分别选择为6.7、7.0和7.3m。所得结果与国外类似工程作了比较,表明是科学可行的。     

Influence of edge velocity on flame front position and displacement speed in turbulent premixed combustion

Using a novel concept, the present study experimentally investigates underlying physics pertaining to statistics of the flame front position and the flame front velocity in turbulent premixed V-shaped flames. The concept is associated with characteristics of the reactants velocity at the vicinity of the flame front, referred to as the edge velocity. The experiments are performed using simultaneous Mie scattering and Particle Image Velocimetry techniques. Three mean streamwise exit velocities of: 4.0, 6.2, and 8.6 m/s along with three fuel–air equivalence ratios of: 0.7, 0.8, and 0.9 are examined. The results show that fluctuations of the flame front position and the flame front velocity are induced by the fluctuations of the component of the edge velocity transverse to the mean flow direction. Analysis of the results show that the mean of the flame front velocity in the normal direction to the flame front is significantly dependent on the vertical distance from the flame-holder. Relatively close to the flame-holder, the mean of the flame front velocity in the direction normal to the flame front is about zero; however, it increases to values several times larger than the laminar flame speed by increasing the vertical distance from the flame-holder.     

Iron Ore Sintering: Process

Sintering is a thermal agglomeration process that is applied to a mixture of iron ore fines, recycled ironmaking products, fluxes, slag-forming agents, and solid fuel (coke). The purpose of the sintering process is manufacturing a product with the suitable characteristics (thermal, mechanical, physical and chemical) to be fed to the blast furnace. The process has been widely studied and researched in the iron and steelmaking industry to know the best parameters that allow one to obtain the best sinter quality. The present article reviews the sintering process that the mixture follows, once granulated, when it is loaded onto the sinter strand. There, the sinter mixture is partially melted at a temperature between 1300-1480°C and undergoes a series of reactions that forms the sinter cake to be loaded into the blast furnace to produce pig iron.     

Condensing Heat Transfer in Steam-Water Condensing-injector

An experiment on the direct heat transfer process between supersonic steam and subcooled water jet was performed, using a steam-water condensing-injector. Photographic observation provided information on the state of flow, and establishment of a critical separate steam-water flow was confirmed. The temperature and pressure distributions along the flow were measured and the effective coefficients of condensing heat transfer were evaluated from the observed data, based on a model embodying an idealized interface between vapor and liquid. In the vicinity of the water nozzle exit, where the vapor-liquid interface was distinct, the heat transfer coefficients obtained were 14–28 (cal/°C.cm².sec), and some correlation was observed among Nusselt, Reynolds and Jakob numbers, upon adopting the velocity and the physical properties of the steam phase. The relations Nu=6.0.Re ^0.9(Pr=1.04–1.10), and Re=1.8×10⁸.Ja ^3.0, i.e., Nu=1.6×10⁸.Ja ^2.7 were derived as a rough estimation. No clear correlation could be discerned in the corresponding data obtained from observation points further downstream, where a distinct steam-water interface no longer existed. In conclusion, it is proposed that, in deriving the correlations between Nu and Re or Ja, the physical properties of the vapor and the vapor-liquid relative velocity should be adopted, on account of the strong dependence of condensing heat transfer on steam velocity and water subcooling.     

规划动态性特征分析及其在城市设计中的应用——以聊城市徒骇河两岸规划发展为例

城市功能交界区是城市一体化发展的重点区域,而城市中央滨水区域则是城市"都市生活"的核心区域。在功能交界区的滨水地带向中央滨水区过渡的过程中,滨水区域凭借便利的交通及优越的自然环境,往往成为城市功能角色转变中最大的区域,也是城市规划管理中最具动态性、最难控制的区域。研究以聊城市徒骇河两岸近十年的规划发展为例,分析规划动态性的成因,探究规划动态管理在城市设计中的应用,为规划编制和规划管理提供借鉴与参考。     

MDS800-60双吸泵的研制与开发

根据辽源泵业公司现有泵型及技术力量在MD580-60泵的基础上对吸水段和首级叶轮进行设计改造,开发出一种新产品MD580-60双吸泵,以扩大市场竞争力。     

保险杠总成检具的设计

分析了汽车前保险杠总成检具各组成部分的定位、检测设计情况,重点分析了两侧翼子板处定位、检测的设计,此检具设计既实现了模拟翼子板功能,又实现了加工的可行性。     

异型铆钉冲模前、后模的电火花加工

电火花加工在民用,国防生产部门和科学研究、模具生产中已经获得了广泛应用。分析了一种异型铆钉冲模前、后模的结构特点,采用电火花来加工此零件。在加工此零件时,通过采用合理的粗、精加工放电参数,保证了零件的加工质量并提高了加工效率。