夏热冬冷地区不同墙体材料节能冬季试验研究

对利用两淮矿区固体废弃物制备的夏热冬冷地区常用的三种新型墙体材料（粉煤灰蒸压加气混凝土砌块、粉煤灰混凝土空心砌块、烧结煤矸石空心砖）与传统粘土实心砖进行了冬季同环境下的能耗评价、环境评价等技术方面的对比试验研究.结果表明,新型墙体材料节能降耗指标均优于传统粘土实心砖,其中粉煤灰蒸压加气混凝土砌块相对较好.     

基于RVA法的河流生态需水量研究

以河流生态水文变化的指标体系（Indicator of Hydrologic Alteration,IHA）为基础,立足整体河流水文情势的流量谱系,采用变异性范围法（Range of Variability Approach,RVA）,进行基于长系列历史流量资料的河流生态需水量估算,并以山西省5条较大河流的生态敏感断面为对象进行研究。结果表明,利用本方法估算的结果是合理的,可为河流生态需水量的估算和水资源的可持续开发利用提供科学依据。     

SAPTIS：结构多场仿真与非线性分析软件 开发及应用（之一）

介绍大型结构多场仿真与非线性分析软件SAPTIS,包括软件中所采用的单元类型、方程求解方法、大坝全过程仿真的开挖浇筑模拟方法、水化热模型、通水冷却模型、温度边界条件、弹性模量模型、徐变度模型、自生体积变形以及掺MgO混凝土特性等,还给出了分析结果表达方式。该软件已成功应用于三峡、二滩、龙滩、小湾、溪洛渡、锦屏、丹江口等四十余个大中型水利水电工程的混凝土坝和其他结构温度场、应力场仿真分析、温控防裂和大坝真实工作性态研究,取得了良好的经济效益。应用成果表明,SAPTIS采用的计算模型能正确反映混凝土材料的热学特性、混凝土结构的应力和变形特性,具有计算速度快、计算规模大、结果精度高等优点。     

基于物联网的灌浆监测系统的 应用研究

物联网是目前飞速发展的新一代信息技术。结合物联网的优势及特点,本文对其在灌浆施工管理中的应用进行了研究;即采用多种无线技术构建了无线灌浆数据监测系统。该系统可将多台灌浆记录仪采集到的灌浆数据发送到中央服务器,形成灌浆施工物联,从而降低布线成本,简化工程设计,实现灌浆记录仪的全面监测,直观有效地进行灌浆施工管理,为灌浆行业的蓬勃发展提供了技术保障。     

灌区闸门智能调度系统性能评价

针对都江堰灌区渠首闸门智能调度系统模型,利用最小方差的计算原理,定义模型性能判定指标。根据当前需水流量及相对应的闸门开度值,计算当前闸门系统模型的性能判定指标值,并对所得结果进行分析。该方法可以及时有效地对当前使用的闸门系统模型进行监控与修正,同时也可以应用到数据分析中,对预测模式的应用进行评估。     

Numerical investigation of drag force on flow through circular array of cylinders

A 2-D model for flow through a circular patch with an array of vertical circular cylinders in a channel is established using the Navier-Stokes equations with a hybrid RANS/LES turbulence model–the Scale Adaptive Simulation (SAS) model. The applicability of the model is first validated by test cases where experimental data are available for comparison with the computed results. It is verified that the present model can predict well the average velocity and turbulence structure. The drag force and drag coefficient are then calculated using the present model for a number of cases with different solid volume fractions, cylinder Reynolds numbers and patch diameters. It is shown that the drag coefficient increases with increasing solid volume fraction, but decreases with increasing Reynolds number. However, the drag coefficient is independent of the diameter of circular batch when the solid volume fraction and Reynolds number are kept constant.     

Heat transfer characteristics in micro-fin tube equipped with double twisted tapes： Effect of twisted tape and micro-fin tube arrangements

An experimental study was carried out to investigate the influence of double twisted-tape inserts (DTs) in micro-fin tubes (MFs) on heat transfer, friction factor and thermal performance factor characteristics of the compound devices in the following configurations: (1) twisted tapes acted in the same direction (for co-swirl) while MF and twisted tapes acted in the same (parallel) direction (MF-CoDTs:P), (2) twisted tapes acted in the same direction (for co-swirl) while micro-fin tube and twisted tapes acted in opposite directions (MF-CoDTs:O) and (3) twisted tapes acted in opposite directions for counter swirl (MF-CDTs). The MF alone and the MF equipped with a single twisted tape in parallel/opposite arrangement were also considered for comparison. The experiments were conducted for the flows with the Reynolds numbers between 5 650 and 17 000, under uniform heat flux condition. The experimental results indicate that MF-CDTs induce stronger swirl/turbulence flow, resulting in higher heat transfer rate, friction factor and thermal performance factor than other combined devices. The thermal performance factors associated with the use of MF-CDTs were found to be higher than those associated with the uses of MF-CoDTs:P, MF-CoDTs:O and MF alone up to 9.3%, 6.5% and 56.4%, respectively. The empirical correlations developed using the present experimental data for the Nusselt number, friction factor and thermal performance factor are also reported.     

The optimal retrieval of ocean color constituent concentrations based on the variational method

In this paper, a new approach to the optimal retrieval of the ocean color based on the variational method is developed by setting up a rational target functional combining with the Broydor Fletcher, Goldfarb, Shanno (BFGS) optimal algorithm. The numerical tests and the exemplary retrievals are carried out and compared with the statistical retrievals and the optimal retrievals based on the genetic algorithm. The results show that this approach enjoys a higher accuracy as compared to the statistical method and a higher efficiency as compared to the genetic algorithm. The optimal retrieval method presented in this paper provides a new idea for the ocean color inversion and could also be used as a reference for the direct assimilation of the satellite data into the ecological models.     

基于CFD的新型结构静压油垫数值仿真技术

为了提高重载数控机床静压转台的承载能力和油膜刚度,提出了一种具有多环形流道油腔和阻尼型封油边结构的新型静压油垫,并对其性能进行了研究.在对静压油垫结构优化设计的基础上,利用CFD(computationalfluid dynamics)数值仿真技术,采用二维轴对称流动模型对新型结构静压油垫的流场特性进行了仿真分析,得到了新型静压油垫的内部流场特性,计算出油垫的承载能力和油膜刚度,并与单腔体、单平面封油边结构的静压油垫进行了对比.研究表明:新型静压油垫能通过在阻尼流道和阻尼槽内形成紊流,增加流动液阻,实现压力增益,并可在阻尼槽处产生局部静压效应,从而使新型结构静压油垫的承载能力和油膜刚度较传统结构静压油垫有所提高;此外,采用CFD技术有助于对复杂结构的静压油垫进行优化设计与性能计算,从而提高设计效率和计算准确性.