12V280ZJ型柴油机机体设计

大连机车车辆厂于1997年3月起与美国西南研究院合作开发12V280ZJ型柴油机,目前该柴油机已进入样机试制阶段.本文围绕12V280ZJ型柴油机机体的设计,着重介绍了该机体的结构和分析方法及其参数化的设计手段.     

浅析16V280ZJA型与16V240ZJ系列柴油机的异同

分析了16V280ZJA型与16V240ZJ系列柴油机技术参数及结构的异同、各自的特点及检修中的区别,为运用和检修部门提供方便.     

16V280ZJ型柴油机连杆断裂失效分析

针对一起16V280ZJ型柴油机连杆断裂故障,通过对断口的宏观、微观分析,找出了引起连杆断裂的原因,并对16V280ZJ型柴油机连杆的修理及使用提出了建议。     

一种防止柴油机停缸飞车的装置

1 引言 16V240ZJ型和16V280ZJ型柴油机都采用单体泵,16个喷油泵的供油齿条通过2根供油拉杆控制。     

16V280ZJ型柴油机喷油泵齿杆窜油问题原因分析及相关解决对策

从DF8B、DF11、DF11G型机车用16V280ZJ型柴油机喷油泵工作状态入手，分析了16V280ZJ型柴油机喷油泵齿杆窜油问题产生的原因，并提出了解决对策。1024套改进方案经过近2年的实际运用考核表明，达到了设计要求，用户反映良好。     

16V280ZJB型高强化机车柴油机机体动应力试验研究

针对16V280ZJB型大功率柴油机机体进行了柴油机在100r/min额定转速负荷特性、空载特性和牵引特性工况下的机体动应力试验.并将试验结果与国内外同类型柴油机的机体应力状态进行分析比较,为16V280ZJB型柴油机机体进一步优化设计提供依据.     

R16V280ZJ型柴油机气缸盖的设计

简要介绍了R16V280ZJ型柴油机气缸盖结构设计、气道吹风试验、气缸盖静强度试验、机械变形及温度场试验。     

TPR61-A10增压器在R16V280ZJ型柴油机上的配套研究

通过TPR61-A10增压器与R16V280ZJ型柴油机的配套试验,测试了不同供油提前角、不同喷嘴环面积及环境温度变化对柴油机性能的影响,优化了柴油机的装车运用性能和系统结构.     

12V180ZJ型柴油机气缸套穴蚀问题的探索

针对12V80ZJ型柴油机气缸套穴蚀的形式和特点，分析其原因，提出改进材料的选择和附加装置的设计，为解决问题提出方法和建议。     

某16V250ZJ柴油机机体动应力测试与对比研究

针对16 V250 ZJ柴油机机体的结构特点,选取相应的动应力测试点,通过动应力测试对机体关键部位的应力状态进行分析,并和同类型柴油机进行对比分析。结果表明,16 V250机体各部位的应力幅值较同类型机体偏低,结构合理,刚度适中。该研究方法和结果可供机体的进一步优化与改进设计做参考。     

汽油机怠速旁通阀进气特性研究

利用软件对发动机怠速工况下旁通阀进气进行仿真分析,结合实验数据验证所建立的模型的精度,在此基础上,利用验证后的模型对点燃式发动机起动工况下的旁通阀进气特性进行了模拟,结合平均值模型对汽油机进气特性的描述,建立了发动机的旁通阀进气模型。     

Simulation of a hydrogen/natural gas engine and modelling of engine operating parameters

At the present work for improving the engine performance and decrease of emissions, a port injection gasoline engine is converted into direct injection. Engine performance behavior was investigated by AVL Fire software with adding hydrogen to natural gas from 0% up to 30%. Validation of the simulated model and experimental results show good confirmation. To determine the relationship between independent variables engine speed, ignition timing, injection timing and H₂% versus the dependent variables including engine performance parameters, specific fuel consumption, CO and statistical analysis models were used. Comparison between different errors models shows that Radial basis function model with training algorithm Bayesian regularization back propagation can estimate better engine performance variables. The results showed that adding hydrogen to natural gas cause the output power, torque, fuel consumption efficiency increase and specific fuel consumption drop. Also, CO decreases when ignition and injection timing be advanced and engine speed reaches to its largest.     

发动机缓速制动技术浅论

分析了发动机缓速器的工作过程及其制动能力,介绍了两种典型发动机制动的机构特征,工作原理及性能特点等,对目前最新的发动机缓速器技术进行了比较全面的分析.     

热声热机的热力学分析

回顾了热声现象的研究历史,介绍了热声热机的结构和分类,基于气体微团的热力学循环和能量转换,分析了热与声功的转换原理、转换条件以及热声热机的工作机理,并指出了该研究领域的工业应用前景。     

Development of a high-pressure hydrogen injection for SI engine and results of engine behavior

A high-pressure hydrogen injector was designed and developed in the laboratory. The injector was hydraulically operated by a separate pump. Measurement of injection characteristics on a bench stand showed very repetitive performance of the injector. The injection system was used to supply hydrogen fuel to a single-cylinder spark ignition engine. Results of the tests showed that the engine performance was superior to that achieved with carbureted gasoline fuel.     

Efficiency of a Miller engine

Using finite-time thermodynamics, the relations between thermal efficiency, compression and expansion ratios for an ideal naturally-aspirated (air-standard) Miller cycle have been derived. The effect of the temperature-dependent specific heat of the working fluid on the irreversible cycle performance is significant. The conclusions of this investigation are of importance when considering the designs of actual Miller-engines.     

Optimum Stirling engine geometry

This paper combines the author's work on mechanical efficiency of reciprocating engines with the classic Schmidt thermodynamic model for Stirling engines and revisits the problem of identifying optimal engine geometry. All previous optimizations using the Schmidt theory focused on obtaining a maximal specific indicated cyclic work. This does not necessarily produce the highest shaft output. Indeed, some optima based upon indicated work would yield engines that cannot run at all due to excessive intrinsic mechanical losses. The analysis presented in this paper shows how to optimize for shaft or brake work output. Specifically, it presents solutions to the problem of finding the piston‐to‐displacer swept volume ratio and phase angle which will give the maximum brake output for a given total swept volume, given temperature extremes, a given mean operating pressure, and a given engine mechanism effectiveness. The paper covers the split‐cylinder or gamma‐type Stirling in detail, serving as a model for similar analysis of the other Stirling engine configurations. Copyright © 2002 John Wiley & Sons, Ltd.