车用柴油机中冷器空气冷却侧阻力性能计算

建立了车用柴油机中冷器冷却空气侧波翅片通道的湍流数学模型,应用CFD（计算流体力学）方法对中冷器空气冷却侧阻力性能进行数值分析,得到阻力系数与平均流速拟合函数,可为中冷器的设计和优化提供有益的参考．     

某电厂省煤器泄漏原因分析及处理

某火电厂1025 t/h自然循环锅炉省煤器发生泄漏,为保障冬季供暖,泄漏持续12天后机组停机。为查清泄漏原因并降低同类事故发生概率,现场采用外观质量检查并结合运行、检修情况进行了综合分析判断。结果表明：鳍片焊接不规范,鳍片焊缝可能存在咬边、损伤等缺陷,加之焊缝位置应力集中,缺陷不断扩展,最终导致在熔合线附近母材发生泄漏。泄漏介质吹损对侧省煤器护瓦及管子,导致护瓦脱落、省煤器管子泄漏。就此提出更换受损管子及护瓦,扩大防磨防爆检查范围,总结泄漏规律等消缺处理及预防措施,供发电企业及相关从业人员参考。     

Analytical solution for transient temperature and thermal stresses within convective multilayer disks with time-dependent internal heat generation,Part II: Applications

This work investigates the analytical solution for transient temperature and thermal stresses within three circular geometries. First, the transient temperature and thermal stresses within a composite disk are addressed. Then, two examples regarding transient temperature and thermal stresses throughout circular heaters are analyzed. Pulsed and sinusoidal internal heat generations are incorporated into the second and third examples, respectively. For the composite hollow-disk example, merely the separation of variables method (SVM) is used to overcome the energy partial differential equation. For the other two examples, the combination of the SVM and Duhamel's theorem are adopted to solve the partial differential equations. Accordingly, assuming plane stress formulation, the transient thermal stresses within structures are obtained.     

铝合金表面亲水膜层研究

以硅酸钠、乙酸乙酯、聚丙烯酰胺等为主要成分制备出亲水膜层。测定了该亲水膜层涂覆在铝合金表面的亲水性、耐蚀性和耐热性等。结果表明：其亲水性、耐蚀性和耐热性优良，能满足空调铝合金翅片的使用要求。     

大型锅炉火管结构的改进设计

锅炉的火管结构是否合理对提高锅炉的传热效率有着非常重要的作用。针对现有的锅炉火管结构提出了两种改进方法,不仅减少了排烟热损失,节约了燃料,同时简化了火管结构,降低了制造成本。     

高压真空断路器用散热器的自然对流换热特性

为提高高压真空断路器的运行安全,以一种新型高压真空断路器为背景,采用计算流体动力学方法研究了不同环境温度下,圆柱形散热器竖直肋片间自然对流换热特性。结果表明:采用扩大计算区域和设置压力边界条件的方法来模拟计算自然对流换热是恰当的。在散热器肋片缝隙的进口处,气体温度较低、流速较小;在肋片缝隙中部,气体温度升高、流速较大;越靠近肋片根部,气体温度越高,但由于粘性阻力大,所以在肋片根部速度较小。在相同的环境温度下,随着肋片温度的逐渐升高,肋片的换热能力也逐渐升高;在相同的肋温情况下,随着环境温度的逐渐升高,肋片的换热能力逐渐下降。所得的肋片缝隙内自然对流的流动换热特性、肋片表面的平均Nu数对高压真空断路器散热器肋片的热力设计和进一步优化设计有重要的意义。     

Numerical modeling and performance evaluation of multi-tubular sodium alanate hydride finned reactor

The optimization of the hydrogen loading process in a multi-tubular sodium alanate hydride reactor equipped with longitudinal fins is investigated numerically. The effect of the number, thickness and tip clearance of the fins on the hydrogen charging rate is assessed, so that the fin optimal geometric properties are determined by the compromise between the hydrogen loading rate and the fin contribution to the weight and the volume of the storage system. Simulation results have shown that the hydrogen loading rate corresponding to this optimized configuration is 41% greater than the case without fins if we suppose a perfect interconnectivity between the fin tips and the internal walls of the hydride tubes. Otherwise, the amount of stored hydrogen decreases drastically. The loading of hydrogen under high charging pressures results in higher hydrogen loading rates and there is an interaction between the geometric and operating parameters leading to the optimized amount of stored hydrogen.     

在综合换热作用下矩形直肋散热器换热特性

给出了矩形直肋散热器有对流、辐射及导热同时存在的复杂换热问题的一种线性化解析方法。利用该方法，对含有辐射项的非线性微分方程进行了解析求解。分析了对流和辐射对肋效率的综合影响，得出了在综合换热作用下肋散热量的计算公式。     

铝箔亲水抗蚀有机膜的制备及亲水性表征

空调换热器用的铝箔亲水有机膜具有良好的亲水性和抗蚀性，通过流水实验、干湿循环和而腐蚀实验表明，水接触角大约３０°，亲水性持久，膜与铝箔结合牢固．能明显延长铝箔的使用寿命，使空调换热器减少和消除水桥，制冷量提高．     

An experimental study of the effect of pin fins on heat transfer in circulating fluidized beds

An experimental investigation was conducted to study the effect of pin fins on heat transfer in circulating fluidized beds. Experiments were conducted in a 100 mm i.d., 5.15 m tall CFB unit, initially with no fins and then with 16-pin and 32-pin fins. Each pin was 6.35 mm in diameter and 15 mm long. It was observed that, although the heat transfer coefficient decreases with the use of fins, the total heat transfer increases owing to the increase in surface area which the fins provide. The results of heat transfer for unfinned surface were compared with those of other workers and found to be in good agreement.