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。     

液体CO2冷藏车的冷负荷计算及其实验研究

从液体 CO_2冷藏车的制冷原理出发,设计出了符合节能与环保要求的冷藏车厢,同时对厢体的冷负荷进行了计算,在此基础上进行了实验研究以验证厢体设计及其冷负荷计算的合理性。实验发现,液体 CO_2在单位时间内的喷液量对冷负荷的平衡起着至关重要的作用。实验结果还表明,冷藏车厢设计科学,结构合理,具有一定的实用价值和商机,它的推广将为我国冷藏运输业起到积极作用。     

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。     

Secondary cooling technology for high-efficiency continuous billet-casting

The mathematical model of high-efficiency continuous billet casting was developed, incorporating the effective spraying water coefficient and the effective specific spraying water flowrate of secondary cooling. To realize uniform cooling in secondary cooling zones, the spraying cooling structure and the arrangement of nozzles were redesigned and optimized, and an additional spraying cooling zone was used. A new secondary cooling model of spraying water was built. It was found that the required spraying water flowrate of a cooling zone was related with the casting speed, the casting temperature, the compositions of liquid steel and the cooling water temperature of secondary cooling. The operation of the reformed caster proved that the spraying cooling structure and the new secondary cooling model were suitable, and the casting speed was greatly enhanced. The highest casting speed was (3.8 to 4.0) m/min for billet with a section of 150×150 mm2. The quality and the output of the billet were improved, and the economical benefit was heightened.     

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。