带冷气掺混的涡轮级三元流场分析

航空发动机向大幅度提高推重比和降低油耗的方向发展.涡轮进口温度在不断的提高.随着叶片热负荷的加大,冷却用气量也不断加大,最多已占到涡轮进口流量的20%左右.冷却气的喷射对高压涡轮级的三元流场会产生不可忽略的影响.在多叶片排三元N-S方程并行解的基础上,采用冷却气射流源项模型,研究了某带冷气掺混的高压涡轮级的流场和温度场分布特点.     

Effect of controlled rolling/controlled cooling parameters on microstructure and mechanical properties of the novel pipeline steel

The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel has been optimized by the orthogonal experiment with four factors and three levels in this paper. However, the parameters of thermo-mechanical control process （TMCP） optimized by the Gleeble-3500 hot simulator could not satisfy performance requirements of the X100 pipeline steel. In order to improve the performance of this steel, the influence of finish cooling temperature （FCT） on the microstructure and property is studied in detail. It is found that, as this steel is thermo-mechanically treated by this set of parameters （the start heating temperature, finish rolling temperature （FRT）, FCT and cooling rate of 1,180 ℃, 810 ℃, 350 ℃ and 35 ℃/s, respectively）, the micro- structures are mainly composed of granular bainite （GB） and acicular ferrite （AF）. The effective grain sizes are below 20 μm; the steel reaches the optimal balance between the strength and the toughness; the yield strength is 695 MPa; the tensile strength is 768 MPa; the elongation is 16.6 %; the impact energy is 262 J at room temperature. All indexes could meet the requirements of X100 pipeline steel.     

低谷电蓄冷中央空调系统研究

文章提出一种用电低谷时段中央空调蓄冷系统的实现方案,介绍了中央空调水蓄冷系统的结构形式,分析了中央空调蓄冷系统和采用的蓄冷智能控制技术,在此基础上重点阐述了中央空调蓄冷系统设计及按需供冷控制技术的实现。     

高炉冲渣水系统变频技术改造的实施和评价

变频调速技术是一项高效节能技术。本文通过工程改造实例,详细介绍炼铁高炉冲渣水系统变频技术改造的情况。从技术上分析,满足其安全可靠的生产：r-E要求;从改造前后的数据统计分析,这项改造对节约能源,特别是电能,具有重要的现实意义。     

机车冷却水添加剂研究

介绍机车柴油机冷却水添加剂新配方的研制方法和过程，并通过与目前我国广泛使用的各种机车柴油机冷却水添加剂进行比较，证明了新配方更适用于机车柴油机的冷却水。     

D/max-r X射线衍射仪冷却水检测系统的检修

详细论述了一种进口大功率X射线衍射仪冷却水检测系统的工作原理，常见故障的发生原因和检修方法。     

Mathematical model for cooling process and its self-learning applied in hot rolling mill

Control precision of coiling temperature is one of the key factors affecting the profile shape and surface quality during the cooling process of hot rolled steel strip. For this reason, the core of temperature control precision is to establish an effective cooling mathematical model with self-learning function. Starting from this point, a cooling mathematical model with nonlinear structural characteristics is established in this paper for the cooling process of hot rolled steel strip. By the analysis of self-learning ability, key parameters of the mathematical model could be constantly corrected so as to improve temperature control precision and adaptive capability of the model. The site actual application results proved the stable performance and high control precision of the proposed mathematical model, which would lay a solid foundation to improve the steel product qualities.     

置换通风加冷却顶板系统存在的问题及解决措施分析

介绍了置换通风加冷却顶板空调系统,分析了冷却顶板所承担制冷量的大小和冷板在顶棚的位置对室内气流的影响,总结了针对该系统结露问题的解决措施,为该系统在工程上的应用提供一定参考。     

凝结水中溶解氧超标原因分析及处理

某火力发电厂2号机组凝结水中的溶解氧含量在冬季供暖期间一直不能达到合格范围,溶解氧合格率逐月下降.针对凝结水溶解氧超标问题进行全面排查调整,查找出了机组凝结水溶解氧超标的原因并对存在的问题进行处理,最后总结出凝结水溶解氧超标的调整方法.     

一种机房水冷空调节能系统的设计方案

目前节能降耗已经成为各行业共同的目标,本文提出的方案主要是通过对空调室外机进行改造,对机房流出的循环水进行自然冷却,使空调在冬季减少开机时间,在保证机房中设备正常运行的同时能有效地降低能源消耗。