筒式柴油打桩机工作场景的计算机拟实制作

采用计算机辅助设计和辅助造型软件3DS MAX对筒式柴油打桩机动态工作场景进行了拟实制作,加深了人们对其工作原理、结构特点以及装配关系的认识,提升了筒式柴油打桩机的研究水平。所采用的技术和方法既能促进机械设计技术的创新发展,也能促进计算机拟实设计技术的创新应用,还可为其他领域的设计工作提供帮助。     

柴油机喷雾特性的传统及现代测试方法

介绍了近现代内燃机工作者为了研究柴油机喷雾特性所应用和研究开发的一系列测试柴油机喷雾场的方法及其工作原理，并比较了各种方法的优越性及局限性．最后提出了一个研究出一种能实现瞬态喷雾全场雾滴尺寸及速度同时测量的在线实时测量新技术必要性的观点。     

室温氯铝酸离子液体络合吸附噻吩类硫化物的研究

以室温氯铝酸离子液体作为催化剂 ,将石油一厂的直馏柴油进行预先精制 ,并且在其中加入一定量的噻吩为原料 ,在室温和氮气保护的条件下 ,考察了室温氯铝酸离子液体催化剂脱除噻吩的效果。实验结果表明 :在n(AlCl3 ) /n(BMIMCl)为 2∶1、剂油比为 0 .15、反应时间为 4 0min的条件下 ,氯铝酸离子液体对精制柴油中的噻吩脱除率可达到 4 6 % ,从而说明氯铝酸离子液体具有很好的吸附噻吩类杂环化合物的能力。虽然氯铝酸离子液体对水和空气敏感、不稳定 ,但是可以再生重复循环使用     

BOSCH 传感器特性研究及信号调理电路的设计􀀂

在柴油机电控喷油泵中所采用的传感器是德国BOSCH公司的一种位移式传感器,它是电控喷油泵闭环控制系统中齿条位置反馈元件.本文针对该传感器进行了特性测试,并通过实验研究确定了喷油泵内齿条与传感器位置的物理零点,最后对传感器的信号调理电路进行了设计.     

Influence of V2O5 Addition on Reduction of NO by C3H6 over Pt/V2O5/Al2O3 Monolithic Catalyst

Pt/V2O5/Al2O3 and Pt/Al2O3 monolithic catalysts were prepared by wet impregnation method, and the influence of V2 O5 addition on the catalytic activity for NO reduction by C3 H6 under lean burn condition was investigated in detail.The results show that Pt/V2O5/Al2O3 has better activity of NO reduction than Pt/Al2O3 , adding V2O5 to Pt catalyst makes the temperature window of NO reduction shift further to a lower temperature region.The activity of NO reduction decreases and there is a similar degree of deactivation over the two catalysts in the presence of SO2 in feed gas.Moreover, adding V2 O5 to Pt catalyst resulted in improvement of resistance to SO2 oxidation, which decreases the emission of sulfate particulate.Thermal aging treatment counteractes the promoting effect of V2O5 on NO reduction.     

柴油中不同组分的摩擦特性及表征

采用蒸馏法对国产柴油进行分离并对不同馏分段柴油的摩擦性能进行了考察,同时采用色谱柱分离法将分离出不同的柴油极性组分并对其润滑性进行了考察;通过SEM扫描电镜对不同含量的极性组分润滑下的磨斑形貌进行了表征,应用高频往复试验机分析了摩擦力及电阻曲线。试验结果表明,随着柴油馏出温度的逐渐升高,其抗磨性能逐渐增加;随着柴油极性的增大,柴油组分的润滑性能越好。柴油的摩擦特性与氮含量和多环芳烃之间有较好相关性,柴油的润滑性关键取决于其中的极性有机物及其数量。     

基于特征相位段的柴油机活塞缸套磨损故障诊断

在柴油机缸盖振动信号中，活塞缸套磨损的特征信号通常被燃烧爆发、气阀关闭及相邻缸的振动所淹没。通过分析振动信号各成份在一个周期内的分布情况，提取了干扰较少的排气冲程阶段信号，并在消除了相邻缸的振动影响后，作为活塞缸套磨损的特征相位段。选取峰峰值、平均振值等6个参数作为诊断特征参数，建立了诊断模型。实例表明，该方法能够有效地诊断出柴油机活塞缸套的磨损故障。     

Status,challenges and opportunities of dual fuel hybrid approaches-a review

Consumers conventionally adopt diesel generation to meet the energy needs where the grid connection is unreliable or unavailable. While electrification has provided these communities a variety of economic and social opportunities, diesel consumption has resulted in adverse costs and environmental pollution. Two technologies available to reduce the expense and emissions of diesel fuel reliance include dual fuel or hybrid diesel applications. The dual-fuel approach involves a supplementary gas fuel charge in support of reduced diesel fuel consumption. Hybrid applications involve the integration of renewable generation to displace diesel fuel consumption. This paper reviews the potential for hybrid dual-fuel applications, identifying engine flexibility as a major integration barrier. In comparing the flexibility of various dual-fuel technologies to operate dynamically, this paper presents a critical review across hydrogen, liquified petroleum gas (LPG), natural gas (NG) and blended hydrogen and NG derivatives. The results identify a range of approaches able to improve engine flexibility and thus reduce the cost and carbon intensity of diesel-fired internal combustion engines. At low load conditions, while NG and LPG exhibit similar performance, the use of hydrogen and hydrogen blends provide improved engine performance and response. Unfortunately, given the current cost of hydrogen fuel, significant commercial barriers exist to the adoption of hydrogen or hydrogen blended fuels. Despite this, this review indicates the potential of hydrogen-NG blends to offer additional flexibility in comparison to alternative dual-fuel technologies. This position is furthered considering near term cost targets associated with the development of a global green hydrogen industry, coupled with its ability to serve as a demand-side management approach within isolated power systems, one of the multiple future research themes.     

Combustion analysis of the diesel–biogas dual fuel direct injection diesel engine – the gas diesel engine

In this investigation, biogas (BG) was used as an alternative fuel in a single-cylinder, four-stroke, air-cooled, direct injection (DI) diesel engine that was operated on a dual fuel mode. Biogas was produced from a non-edible seed de-oiled cake-pongamia pinnata (Karanja), which was collected from the biodiesel industries. The BG was inducted along with the air in suction of the engine at four different flow rates varying from 0.3?kg/h to 1.2?kg/h in steps of 0.3?kg/h. The investigation results revealed that BG inducted at a flow rate of 0.9?kg/h gives better combustion characteristics of engine behaviour than those of other flows throughout the engine operation. The ignition delay (ID) and combustion duration of the engine run by dual fuel operation at a BG flow rate of 0.9?kg/h were found to be longer by about 2 °CA and 2.9 °CA, respectively, in comparison with diesel at full load. The cylinder peak pressure was found to be overall higher by about 11?bar than that of diesel at full load.