基于CFD的多锥段旋流器内部流场的数值模拟

针对疏浚泥浆中固体颗粒粒度小,粒级分布范围宽的特点,提出了一种新型的多锥段旋流器结构,并采用雷诺应力(RSM)湍流模型,应用Fluent软件对旋流器内部的三维流动进行了数值模拟,得到了压力场和速度场的分布规律。实验测试结果验证了数值模拟结果的正确性,为该类型旋流器进行进一步的优化设计提供了理论依据。     

提高自蔓延高温合成复合管陶瓷层性能的研究

自蔓延高温合成是材料合成新技术,具有工艺简便、能耗低、无污染、效率高等特点,应用该技术制造的复合钢管具有耐磨、耐蚀、隔热等优点,SHS复合管的性能决定于内衬陶瓷层性能.从提高陶瓷层致密度、韧性、表面质量及降低裂纹率等方面,综述了提高SHS复合管内衬陶瓷层性能的措施.     

复合控制技术在励磁电流调节器中的应用

本文以交流异步电动机一直流发电机组为负载仿真研究对象,对直流发电机励磁电流控制的理论、方法和实现问题进行了较为深入、全面的研究。同时给出了带死区的Bang-Bang-PI复合控制算法在励磁电流控制中的应用,并结合复合控制算珐,用MATLAB进行了仿真,取得了令人满意的结果。实验结果分析,表明复合控制算法在控制系统中的运行,连到了预期目的。     

TAMBOCOCHA43区块尾管固井难点及对策

厄瓜多尔TAMBOCOCHA区块单井日产量300~1100 t。因开采需求导致井身结构特殊,φ244.5 mm技术套管下深距产层小于30 m,随钻井径数据失真严重,水泥浆用量难以确定,φ177.8 mm尾管固井施工风险高。下尾管前不通井、窄间隙顶替效率低、产层油水活跃等问题导致固井质量难以保证。通过对复合前置液体系设计,微膨胀胶乳水泥浆体系研究及窄间隙旋转尾管固井施工工艺研究,形成了TAMBOCOCHA区块底水油藏旋转尾管固井技术,该技术有助于尾管下入到位,准确估算裸眼段环空容积,有效提高套管居中度;前置液冲洗效率为93%,水泥浆12 h抗压强度为36.4MPa。现场应用15口井,固井质量优质率达95%,为强底水油藏大斜度小间隙井固井提供技术支撑,解决了厄瓜多尔TAMBOCOCHA区块特殊井身结构的固井难题。      

复合微生物菌肥对甘蔗生长的影响

通过盆栽试验研究了复合微生物菌肥在甘蔗上的应用效果。结果表明:施用含枯草芽孢杆菌(Bacillus subtilis)和解淀粉芽孢杆菌(Bacillus amyloliquefaciens)的复合微生物菌肥(有效活菌数≥3.0亿个/m L)能显著提高甘蔗叶片氮平衡指数和叶绿素SPAD值,增强根系活力,提高干物质积累量。以施用2次复合微生物菌肥的处理最为显著,与对照相比,甘蔗叶片氮平衡指数和叶绿素SPAD值分别提高16.7%和12.1%,根系活力增加53.1%,干物质积累量提高59.4%。可见,在常规施肥基础上,配施复合微生物菌肥可以促进甘蔗生长,提高产量。     

优化催柴质量途径的探索

催化裂解柴油质量不好,易变色,给经营销售带来很大困难。曾采用过白土精制办法,但效果不佳,损失率大;经探索采用柴油复合精制剂,该工艺合格率高,损失率小,效益可观。     

Effect of organoclay on the mechanical/thermal properties of microcellular injection molded PBT–clay nanocomposites

An organically modified montmorillonite (MMT) was compounded with polybutylene terephthalate (PBT) in a twin-screw extruder. The organoclay PBT nanocomposites were then injection molded by conventional and microcellular methods. Nitrogen was used as the blowing agent. The effect of organoclay content, organoclay size (8 and 35 μm), and speed of the screw (80 and 100 rpm) on the mechanical and thermal properties were investigated.     

Surface plastic deformation distribution and microstructural evolution in the compound rolling of Ti–50Al billet

Compound rolling, which uses two different roller profiles to create plastic strain variation in the surface of a material, is described in this study. Based on the local load theory, equipment for the plastic deformation on the surface of the rectangular billet has been produced. The compound rolling behavior of Ti–50Al billet has been studied using this equipment. In order to study the deformation distribution of compound rolling, the flow net method for strain measurement has been employed. The deformation differences between compound rolling and flat rolling have been investigated with the commercial finite element method (FEM) code DEFORM-3D. The microstructure and the hardness from the surface to the center of the Ti–50Al billet developed through compound rolling has been characterized. These results indicate that the compound rolling technique results in severe plastic deformation near the surface with limited strain towards the center of the billet. This can result in compound microstructures, with fine recrystallized grains in the near surface region and the original directionally solidified microstructures in the center, and improve the hardness on the surface of the billet significantly.     

化合物半导体探测器

根据半导体核辐射探测器对材料的要求,在z>30,E_g在1.3—2.6eV间的二元化合物半导体中,HgI_2、CdTe和CdSe可能是三种最好的材料,讨论了用这三种材料制成的探测器性能。介绍了我国核探测器用化合物半导体的研制情况。     

超宽带对数周期天线馈源低损耗封装材料及工艺研究

根据某工程搜索捕获引导天线馈源的设计要求，介绍了采用聚醚型硬质聚氨酯泡沫塑料及环氧玻璃纤维复合材料伯为馈源透波封装材料的结构与工艺。