A型地铁空调系统及客室内流场数值分析

为给目前国内A型地铁车辆的舒适度设计提供理论参考,针对地铁车辆静压风道结构特点,基于k-ε两方程湍流模型和SIMPLE算法,建立包含空调送风风道和客室的三维计算模型.对计算模型的空气流动和传热状况进行CFD数值计算.计算过程综合考虑车体壁面传热和人体散热等多种传热.分析计算结果得到客室内温度场和速度场的分布规律,并对空调通风设计方案进行量化评估.计算结果表明:客室内人体头部区域温度场分布均匀,平均温度为26.6℃,最大温差为6℃;车厢内有较理想的气流组织形式,速度分布范围为0.50~0.79 m/s,而且客室端部和中部区域人体头部周围速度较大.将计算结果与欧洲EN 14750-1标准进行对比分析,认为乘客的舒适性较好.     

Heavy metals contribution of non-aqueous fluids used in offshore oil drilling

A monitoring program was performed to investigate heavy metal content alteration due to exploratory drilling for oil using non-aqueous fluids (NAFs) in Brazilian offshore, 900 m deep. Fourteen elements were monitored in 54 sites and it was verified that after drilling activities the average Ba concentration was remarkably increased with respect to background level, even 1 year after the activity. A minor increase in Mn and a moderate increase in Al concentrations were verified. The Cd, Cr, Ni, As, Co, Cu, Pb, V, and Zn concentrations were at the background levels, ca. 1 year after the NAFs drilling materials deposition on the seafloor. The Al, Ba, Cd, Cr, Cu, Ni and Zn mean concentrations were significantly different (P<0.05) between the three sampling operations (cruises) performed, while As, Cd, Fe and Pb presented different mean values according to the distance of the oil well, independent of the sampling operation. Interaction between sampling operation and distance was observed for Mn. In all sediment samples the Hg concentration was below the detection limit (0.07 μg g⁻¹).     

搬运机器人在钻杆生产线物料输送系统中的应用

针对钻杆生产线中物料输送的特点和难点,设计了基于搬运机器人的智能输送系统,介绍了系统的组成、工作流程、以及Profibus总线配置。调试表明,该系统能够满足搬运物料的设计目的,对提高生产效率具有较高的应用价值。     

自升式钻井平台DCS集成配置的研究

自升式钻井平台DCS（集散系统）是平台自动化控制的核心,该系统可以实现对整个平台及其重要设备的状态监测、控制、报警、记录等功能。本文对现有部分自升式钻井平台的DCS配置情况进行分析,致力于形成一种功能相对完善,配置相对合理的集成配套形式,可为自升式钻井平台项目DCS的搭建提供一个有益参考。     

Air sampling of volatile sex pheromone components in a closed jar

A cotton wool plug, used as the source for pheromone release, was placed in closed 1-quart Mason jars, either at the mouth or at the rear of the jar. Air sampling of the two components of the sex pheromone (total 2.2 mg at the source) of the almond moth (Ephestia cautella) female showed that the saturation period near the source in still air was 20–22 hr and that far from the source was 40–50 hr, reaching a level of less than 1 ng/ml air. The ratio between the components (Z,E)-9,12-tetradecadienyl acetate, designated D, and (Z)-9-tetradecenyl acetate designated M, in the air was close to the original ratio for both sampling sites, albeit somewhat richer in the more volatile (Z)-9-tetradecenyl acetate (source 77.023.0 DM, air 73.0– 74.327.0–25.7; source 80.119.9, air 77.622.4; source 25.174.9, air 23.976. 1 DM). The total amount of pheromone per milliliter of air was two to three times larger near the source than far from it at the early stages of the evaporation and saturation process. When the amount of pheromone applied to the source was tripled (7 mg), the amount far from the source was almost tripled, or the saturation time was cut by factor of two to three.     

Progress and recent trend in MILD combustion

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs.However,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its application.Our research and development on this combustion has been performed for several years. We have found that the requ...     

超视距空战飞行轨迹建模及仿真

超视距多目标攻击逻辑决策和空战态势评估是超视距空战研究的主要方面,但对空战战术影响较大的战机飞行轨迹和飞行参数的研究较少.通过对超视距空战和视距内空战的比较,分析了超视距空战的空战过程.根据超视距空战迎头攻击战术的特点,建立了相应飞行轨迹的数学模型,并求解了载机速度、载机发射导弹速度、转弯速度、载机转弯半径、目标机速度、载机飞行时间、转弯时间和导弹飞行时间之间的关系.通过仿真分析了飞行参数对飞行轨迹的影响,并根据载机性能约束条件,求解了飞行参数的最优解.仿真结果表明,飞行轨迹模型和最优飞行参数设计的合理性和可信性,可为超视距空战战术、战法决策等作战应用提供重要参考.     

500kV断路器因空气压力低告警导致断路器控制保护回路断线分析

针对天生桥换流站500kV三菱断路器因空气压力低告警导致断路器控制保护回路断线这一情况,根据工作站中出现的信号,结合断路器的控制、保护二次回路,对信号及其出现的缘由进行分析,评估断路器控制保护回路断线时,可能出现的安全生产风险,发现目前存在的问题,并对这些问题提出解决方案。     

调节阀“三断”保位方案在焦化厂的应用

根据厂区所使用的调节阀自身具备的功能以及生产工艺需求,选择合适的（三断）保位方案,分析了所选择方案的工作原理及优、缺点及适用条件.     

莱钢2#竖炉自控系统的应 用

针对莱钢2#竖炉存在的问题,对其自控系统进行升级改造,以确保系统稳定运行,提高生产效率。