钢桁架连梁-联肢剪力墙耗能机理及抗震性能试验研究

对设置全钢桁架连梁和设置钢筋混凝土、钢桁架混合连梁的双层联肢剪力墙平面结构进行了拟动力试验和低周反复荷载试验,研究了不同工况地震波作用下剪力墙的时程响应,以及其破坏机理、承载力、滞回延性性能、耗能机理、刚度及强度退化机理。试验结果表明：全部设置钢桁架连梁的剪力墙的刚度分布合理,耗能机理及刚度强度退化机理符合联肢剪力墙抗震设计的要求。大震时,在保证较高耗能能力的同时能够维持较高的承载力和刚度,持续约束墙肢,抗震性能优于混凝土连梁联肢剪力墙体系,是一种较理想的连梁设置方案。     

温8区块复合深部调驱体系的制备与评价

针对温米油田温8区块油藏地质条件,采用水驱流向改变剂／弱凝胶复合深部调驱技术。选用粒径为3～5mm水驱流向改变剂2^#用于复合调驱体系;并研制了适合该油藏条件的弱凝胶体系,确定了其最佳配方：聚合物HPAM浓度1000～1500mg／L,交联剂FO浓度300mg／L,交联剂GR20mg／L,稳定剂WD浓度100mg／L,除氧剂CY浓度100mg／L。通过岩心流动实验,评价水驱流向改变剂／弱凝胶复合深部调驱体系对吸水剖面的改善能力。结果表明,该复合调驱体系可大幅提高吸水剖面改善率,适用于温8区块的调驱作业。     

透明聚丙烯流变行为研究

分别考察了自主研制、进口、国产透明聚丙烯(PP)专用料ZPP,R 370 Y,J 301 G的流变行为.结果表明,ZPP,R 370 Y和J 301 G熔体均属于非牛顿型假塑性流体;R 370 Y专用料对温度的敏感性较大.成型加工时宜进行温度调整;ZPP和J 301 G专用料对剪切敏感性较大,成型加工时宜进行剪切速率或剪切应力的调整;透明PP专用料的相对分子质量及其分布对其表观黏度有一定影响;ZPP的各项力学性能均优于S 800型通用PP.     

Thermal stratification in ribbed liquid hydrogen storage tanks

A significant decrease in the degree of thermal stratification is demonstrated by improvising transverse wall ribs on the inner cylindrical surfaces of large liquid hydrogen storage tanks. The ribbed surfaces are modeled as fins and a conjugate transient heat transfer problem is formulated for predicting flow currents and heat transfer. Turbulent Rayleigh numbers between 1.2×10¹²$1.2\times {10}^{12}$ and 6×10¹⁶$6\times {10}^{16}$ are considered. A stratification parameter based on the moment of energy is defined to quantify the degree of stratification and this parameter is seen to be about 30% lower for the ribbed tanks. The degree of stratification is not sensitive to changes in the ratio of the rib height to the spacing between the ribs. The transient free convection is shown to be characterized by the parameter Fo×Ra^0.15$\mathrm{Fo}\times {\mathrm{Ra}}^{0.15}$. The process of stratification takes place more slowly in the ribbed tanks than in smooth-walled tanks. The free convective heat transfer coefficient for tanks having ribbed surface is also seen to be significantly lower. Incorporation of ribs over the inner surface of the insulated tanks is demonstrated to offer a simple means of reducing the stratification and boil-off losses.     

竖向荷载作用下墙梁的弹塑性分析

通过分析总结近年来国内外对砖砌体的本构关系和破坏准则的理论研究成果,找出了较合理、适用的本构关系和破坏准则的组合,能较好地描述墙梁受力破坏的力学特性。并基于塑性理论,编制了“墙梁结构弹塑性有限元法计算程序”,对一些算例进行了验算,得到较好的结果。采用对比分析和图表显示的方法,得出在竖向荷载作用下,随着弹塑性的发展,墙体竖向压应力的变化规律。     

阀体强度计算比较与分析

以我厂设计的DN300；PN25闸阀的铸造阀体为例，应用我厂、美国、原西德等国有关强度计算标准进行对比性计算，加以分析，证明了尽管计算方法有一定的差别，但结果基本一致。     

混凝土挤压式边墙技术在黄河公伯峡水电站工程中应用

黄河公伯峡水电站是我国混凝土面板堆石坝第一家采用混凝土挤压式边墙技术。本文就该技术与传统技术(斜坡碾压)在施工工艺方面作了简单比较,从而证明该技术在坝体填筑方面有加快施工进度、提高填筑强度、缩短施工工期,并方便施工等优点。     

夏热冬冷地区"双层皮"玻璃幕墙节能技术研究

玻璃幕墙是影响到建筑能耗的关键部位。本文分析了传统玻璃幕墙的弊端;通过玻璃幕墙的耗能计算公式说明影响玻璃幕墙耗能的相关因素;阐述了适合夏热冬冷地区的节能型玻璃幕墙—“双层皮”玻璃幕墙的构造和节能原理;通过实验验证了“双层皮”玻璃幕墙比传统的“单层皮”玻璃幕墙具有更佳的热工性能,其节能效果与通风和遮阳构造设计等有关。     

多斜孔气膜冷却传热特性数值研究

对三种不同结构的多斜孔气膜冷却结构进行了数值研究。多斜孔均为叉排结构,斜孔与平板表面夹角均为30,°重点研究了不同相邻孔间距与孔径比Pm/dm(3.0～5.0)和不同吹风比M(0.5～1.5)对热侧壁面绝热温比和换热系数的影响规律。     

The near wall behavior of an impinging jet

The present work investigates the applicability of scaling log-laws to the turbulent impinging jet. Both, the velocity and the temperature fields are studied under this assumption. To validate the proposed expressions, a detailed experimental program was carried out based on thermal anemometry. The experiments were conducted for one nozzle-to-plate spacing (H/D = 2.0) and Reynolds number of 35,000. A constant wall heat flux condition was achieved by conducting electricity through thin resistors that were placed beneath an aluminum disk. Measurements of local velocity and of temperature distributions are presented as well as longitudinal turbulence profiles. The mean temperature profiles were measured through thermocouples.