涡轮冷气掺混数学模型的研究

本文建立了涡轮冷气掺混的数学模型,推导了考虑冷气掺混的气动热力学方程,并在非正交曲线坐标系下进行了展开,为计及冷气掺混的涡轮内流场的数值计算奠定了理论基础。     

MH水溶性淬火介质的冷却能力及应用研究

研究了 MH 水溶性淬火介质的物理性能和冷却特性,并对部分碳钢,合金钢在淬硬能力、淬透性、淬火变型与开裂等方面进行了基础性试验,举例介绍了 MH 介质代替油和硝氯盐淬火所取得的良好结果。     

一种乳化炸药连续乳化冷却工艺技术

文章对国内乳化炸药生产现状进行了分析,介绍了一种高效实用的乳化炸药连续乳化,冷却工艺技术的研制过程和试生产情况。     

马钢300 m3高炉冷却壁工作状态下的温度场与热应力分布

在解剖研究取得的对高炉冷却壁破损机理认识的基础上,使用开发的有限元程序计算并研究了高炉冷却壁工作状态下的温度场和热力应力分布,对灰口铸铁和球墨铸铁两种冷却壁材质的最大热应力进行了分析和比较,据此提出了冷却壁设计的一些改进性建议。     

引信传爆序列优化设计的有效途径

分析了中,大口径榴弹引信传爆序列的结构特征和传爆机理,着重介绍新一代组合火工品改造传统式传爆序列设计中带来的影响,分析了组合式传爆序列的发展前任。     

Thermodynamic performance assessment of an indirect intercooled reheat regenerative gas turbine cycle with inlet air cooling and evaporative aftercooling of the compressor discharge

This study provides a computational analysis to investigate the effects of cycle pressure ratio, turbine inlet temperature (TIT), and ambient relative humidity (φ) on the thermodynamic performance of an indirect intercooled reheat regenerative gas turbine cycle with indirect evaporative cooling of the inlet air and evaporative aftercooling of the compressor discharge. Combined first and second‐law analysis indicates that the exergy destruction in various components of gas turbine cycles is significantly affected by compressor pressure ratio and turbine inlet temperature, and is not at all affected by ambient relative humidity. It also indicates that the maximum exergy is destroyed in the combustion chamber; which represents over 60% of the total exergy destruction in the overall system. The net work output, first‐law efficiency, and the second‐law efficiency of the cycle significantly varies with the change in the pressure ratio, turbine inlet temperature and ambient relative humidity. Results clearly shows that performance evaluation based on first‐law analysis alone is not adequate, and hence more meaningful evaluation must include second‐law analysis. Decision makers should find the methodology contained in this paper useful in the comparison and selection of gas turbine systems. Copyright © 2006 John Wiley & Sons, Ltd.     

The mathematical model of solidification latent heat under high cooling rate

Treatment of solidification latent heat is a key point in solidification simulation by the finite difference method. When latent heat is dealt with in a traditional method of equivalent latent heat, it was found that heat was increased when casting with a high cooling rate, and then the simulation result was distorted. In this paper, a new method is proposed to deal with solidification latent heat. Moreover, a mathematical model was suggested, in which the latent heat can be dealt with accurately under high or normal cooling rates. By contrasting the simulation results from this new method with the traditional one, it was indicated that this new model can obtain more accurate simulation results than the traditional model under high or normal cooling rates. © 2006 Wiley Periodicals, Inc. Heat Trans Asian Res, 35(2): 115–121, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20104     

集中供冷系统在广州地铁二号线的应用

广州地铁二号线15个地下车站由4个集中冷站提供空调冷水，集中供冷系统由三部分组成，采用大温差供冷(供回水温度7℃／15℃)，二次冷水泵采用变频控制。介绍了EMCS系统实现的功能及运行模式。     

阶梯形零件的冷挤压工艺研究

详细介绍了阶梯形零件冷挤压工艺的制订过程，根据实践经验总结了其冷挤压模具设计的结构特点。     

紫外激光冷却镁原子

利用反向激光与原子跃迁产生共振,可使Na和Cs原子减速。与Na和Cs原子相比,Mg原子结构对于冷却更为方便。Mg原子的部分能级示于图1。从图中可以看出,区别于Na或Cs原子的是Mg原子的基态没有精细结构,因此也就避免了光泵效应。当然有一定输出功率的与Mg原子的~1S_0—~1P_1产生共振跃迁的285.2nm的激光是必要的。