柴油机燃油电控喷射用快速电磁阀的研究

阐述了快速电磁铁实现快速动作的机理,建立了快速电磁铁优化设计的数学模型,并用计算机对其结构进行了最佳化设计。在确定快速电磁铁最佳结构参数的基础上,建立了其动态特性计算机仿真的教学模型,对其动态特性进行了计算机仿真,并对不同能量输入方式和不同线圈参数的仿真结果进行了比较。     

计入冷却液时汽缸套振动特性和穴蚀的研究

研究了计人冷却液时汽缸套穴蚀计算的模型;探讨了在任意力作用下的动力响应计算中,用杜哈曼积分求解解耦方程的问题,以12V180和16V240柴油机为例,按不同约束情况进行了振动计算和分析。     

柴油机汽缸套穴蚀和振动特性的研究

以12V180型柴油机的汽缸套为例,用有限元法对该缸套进行了动力分析,并对引起缸套振动的活塞冲击力的处理进行了探索性的研究。本文从研究缸套计算模型的建立入手,对不同疏密程度网格的计算精度进行了比较,最后选定了144个节点的缸套计算模型作为进一步分析的基础;对不同壁厚、不同支承刚度、不同O型密封圈刚度和O型密封圈不同位置等多种因素的变化对缸套振动特性的影响分别进行了研究,为今后柴油机汽缸套的设计提供了一定的理论依据。     

关于全复合材料气瓶安全问题的思考

本对全复合材料CNG车用气瓶“爆瓶”事故的原因进行了分析和探讨，进而提出合理调整气瓶日充气次数指标，适当缩短气瓶使用年限，以及对疲劳循环次数预留安全系数的建议。     

Particulate matter in marine diesel engines exhausts: Emissions and control strategies

Marine diesel engines emit particles that have a complex nature, being composed by carbonaceous particles, with size spanning from few nanometres to less than one micron, and inorganic particles of micron size mainly made by ashes and sulphates.On a global scale, international shipping is responsible for few percentages of the particulate matter emissions, which also affect climate, but the regional distribution of naval traffic suggests the insurgence of significant exposure risk for population living along the coastal areas, due to chronic exposure effects. Specific strategies should be implemented to reduce the emissions of all the components of particulate matter. This paper aims to present a survey on the current and innovative strategies to remove particles from marine diesel engine exhausts, along with a critical review of the most recent findings on ships emitted particles. Evidences on physical–chemical properties, toxicology and emission factors of the particles were reported. This survey indicates that several strategies can provide a significant reduction of particulate matter emissions from ships and integration between innovative after-treatment systems, ships design and operation procedures can potentially lead to overall reduction of more than 99% even with parallel fuel savings.     

Energy factors for flexible fuel engines and vehicles operating with gasoline-ethanol blends

This work investigates the energy factors for fuel conversion from the analysis of brake specific fuel consumption (BSFC) maps of a sample of 15 engines, representative of 75% of current models available in the Brazilian market. The method also employs the engine driving patterns of power output versus crankshaft speed obtained from bench dynamometer tests. The energy factors obtained from the engine analysis was validated against experiments carried out with two production vehicles in laboratory tests following the 1975 US Federal Test Procedure (FTP-75) procedure and road tests following 16 different urban and highway routes. The fuels used in the tests were hydrous ethanol (E100, 6 v/v % water) and a blend of 22 v/v % anhydrous ethanol and 78 v/v % gasoline (E22). The energy factors found from the 3D engine BSFC map analysis were higher than those obtained from the Willans line, currently adopted as a standard, by 52% for E22 and 57% for E100. The results from the 3D engine BFSC maps and the first vehicle following the FTP-75 cycle and 15 road routes were similar, also close to the results from the second vehicle, qualifying them to be representative of modern flexible fuel spark ignition engines and vehicles.     

对某机车厂引进柴油机机体加工系统的经济评价

本文利用现值原理和投资回收理论,计算了不同方案的长期差量成本现值的差异及差量成本当年的差异.有效地解决了某厂引进设备的经济可行性问题.文中构造的评价模型具有一定的普遍意义.     

车用天然气发动机增压匹配及性能参数优化

运用GEM3D工具离散化的方法建立了某1.5 L自然吸气车用CNG(压缩天然气)发动机GT-Power仿真模型,并用试验数据对模型进行校核,模型最大误差为3.64%.在此基础上进行了CNG发动机增压器匹配分析,用DoE(design of experiment)工具对增压发动机的点火提前角进行了优化,然后优化了不同压缩比和不同过量空气系数下的点火提前角,对压缩比和过量空气系数进行了计算分析.结果表明:仿真模型具有较高精度,方案2为4种涡轮增压器方案中最佳方案,并对该方案进行了台架试验,仿真结果与试验结果误差在4%以内;通过优化点火提前角,扭矩最大提高了9.3%;在各最优点火提前角下,压缩比为12时最优,过量空气系数为1.1时具有最佳经济性.     

基于双有机朗肯循环的 CNG 发动机余热回收系统参数优化及工质选择

为了充分利用 CNG 发动机的余热能量,根据 CNG 发动机的余热能分布特性设计了双有机朗肯循环系统,用来回收 CNG 发动机的排气能量、进气中冷能量以及冷却系统具有的能量。该双有机朗肯循环系统包括高温循环和低温循环,高温循环采用 R245fa 作为工质,用于回收 CNG 发动机排气能量;低温循环分别采用 R245fa , R1234ze 和 R1234yf 作为工质,用于回收进气中冷能量、高温循环冷凝过程中释放的能量以及发动机冷却系统的能量。在 CNG 发动机标定工况下,对双有机朗肯循环系统的参数敏感度进行了分析。结果表明：较高的高温循环蒸发压力和低温循环蒸发温度,较低的高温循环冷凝温度和低温循环冷凝温度可以提升双 ORC 系统的净输出功率和热效率;高、低温循环均选择 R245fa 的方案可以使系统具有较优的热力学性能。     

SRE型智能速度继电器在旋转机械转速监控和保护中的应用

介绍了智能速度继电器的功能和特点,以及在旋转机械转速监控和保护中的应用,对旋转机械的安全运行和工业生产有一定的现实意义。