双离子束溅射淀积DLC膜的结构分析

用双离子束溅射法在５０℃以下的基底上淀积了类金刚石（ＤＬＣ）膜。对ＤＬＣ膜采用扫描电子显微镜、透射电子显微镜及拉曼谱仪进行了结构分析。通过对扫描电子显微镜观察，发现在ＤＬＣ膜中存在金刚石微晶。通过透射电子显微镜分析，确定金刚石微晶具有面心立方结构，计算出的晶格常数与标准值基本相同。通过拉曼光谱分析后，进一步验证了薄膜中金刚石微晶的存在并得出了膜中ＳＰ＾３Ｃ－Ｃ键所占的比例。     

公路项目节能评价分析

车辆本身的燃油经济性和车辆的行驶状态是影响燃油消耗的主要因素,采用项目"有无比较法"计算燃油消耗,可使节能评价的结论具有真实性和可参考性.     

MAN-B&W L.S-MC/MCE系列柴油机倒车故障分析

鉴于MAN-B&W系列柴油机是当前船机市场的主流, 文中结合MITSUI MAN B&W 6L70MC柴油机故障实例,对该系列柴油机操纵系统因结构组成的异同可能导致的倒车问题作了较为详细的对比分析,并提出了一些相应的对策.     

臭氧技术在柴油机中的应用

通过对柴油发动机臭氧助燃机理分析,设计了臭氧发生器,并将其用于6135型柴油发动机台架试验中。试验结果证明：臭氧参与柴油发动机的燃烧过程起到了节油和降低排放的双重效果。     

柴油与LPG/柴油双燃料喷雾特性的对比

采用高分辨率数码照相机对柴油与LPG／柴油混合喷雾特性进行了对比研究。结果表明，随着LPG掺混比的增大，喷雾油滴的平均直径减小，油滴尺寸数目分布曲线向小颗粒方向偏移，小颗粒油滴数目增多，雾化质量提高，使发动机碳烟排放大幅度降低；大颗粒油滴尺寸变化不大，小颗粒油滴尺寸变小，相对尺寸范围和发散边界扩大。随着喷雾贯穿距离的增大，柴油油滴的粒度增大；混合燃料的油滴尺寸的数目分布向小颗粒偏移，累积容积油滴直径则增大；相对尺寸范围和发散边界呈减小趋势，油滴容积分布在较大油滴的范围内渐趋均匀；喷射距离较长，油束射程总是等于油束到达燃烧室壁面的最大距离。     

新型LNG船舶采用双燃料电力推进的优势分析

双燃料发动机的成功研制和装船使用使LNG船舶的推进方式发生了革命性的变化，双燃料发动机与电力推进技术相结合产生的双燃料电力推进方式，集合了两者的优势，具有低油耗、低排放、操纵性能好、载货空间大等突出的特点。鉴于当前LNG船舶运输业务的增长需求和双燃料电力推进在LNG船舶上表现的突出优势，有必要对双燃料推进技术进行必要的关注。     

转体桥跨京沪铁路双幅同步转体施工技术

介绍国道112线35标段双幅桥同时同步转体的施工过程和控制方法,并阐述跨铁路要点转体施工准备、试转、预转、正式转体各步骤的工作及转体同步控制。     

Investigation of soot formation in Diesel-GTL fuel blends under quiescent conditions

In this study, a visual investigation of sprays and flames is performed, and soot formation in Diesel-GTL fuel blends is studied in a specially designed quiescent constant-volume chamber under various ambient gas temperatures and O₂ concentrations. Similar to the case of soot formation during diesel fuel combustion, the sooting zone during the mixing-controlled combustion of Diesel-GTL blends is located in the leading portion of the jet boundaries. Auto-ignition delay and soot concentration decrease with an increase of GTL content in the fuel blend. Soot also decreases with lower O₂ concentration, higher injection pressure, and lower ambient gas temperature. The lack of soot formation at lower O₂ concentrations and lower temperatures suggests that Diesel-GTL fuel blends can be successfully utilized in low-temperature diesel combustion technologies that are currently being developed. Furthermore, this mixing controlled combustion method with Diesel-GTL blends can be used to modulate various engine operation parameters, and therefore to simultaneously reduce the formation of soot and NOx within a wide range of diesel engine loads.     

Reaction characteristics of the diesel oxidation catalyst of particulate matters from the diffusion flame of a oiler burner

The objective of this experimental study is to investigate the characteristics of the size distribution and the number concentration of PM (particulate matters) emitted from the diffusion flame of a boiler burner, which has the same type of combustion as a diesel engine. This study is performed to investigate the emission characteristics of nanoparticles generated from diffusion combustion in diesel fuel, and it considered fuel factors and the reaction characteristics of the nanoparticles on the DOC (Diesel oxidation catalyst). The factors examined in this experiment included the sulfur content in the fuel, the blend of the diesel fuel containing biodiesel and bio-ethanol, and the concentration of engine oil (0.1% and 1.0%) blended with diesel fuel. The particle size distribution of the nanoparticles exhausted from the boiler burner was measured by an SMPS (scanning mobility particle sizer). The number concentration of PM that were smaller than 70 nm in diameter greatly increased in the rear of the DOC when fuel containing 250 ppm of sulfur was used. The experiment also suggested that the particle number concentration in both the front and rear of the DOC was lower when ULSD (ultra low sulfur diesel) fuel blended with biodiesel and bio-ethanol, which are oxygenated fuels, was used than when only ULSD fuel was used. The higher the content of engine oil in the fuel, the higher the particle number concentration was in the front and rear of the catalyst. When the first dilution air temperature is increased from 30°C to 180°C, the nanoparticle number concentration dramatically dropped in the rear of the catalyst when fuel containing 250 ppm of sulfur was used, while the particle size distribution remained almost the same when the fuel with engine oil was used.     

康明斯PT喷油器的技术安装与调整

通过对PT喷油器工作原理的深刻理解和实践经验的总结,确定了应用扭矩法和升程法调整PT喷油器的实用程序和方法。