Design and Research of the EQ6105DTAA Diesel Engine

The EQ6105DTAA diesel engine which first pattern en gi ne is EQD6105T is developed through the original EQ6102 diesel engine and other advanced engine structures. This paper analyses performance parameters, general layout and parts design process of the diesel engine. The development cycle is s horten by CAD/CAE/CAM technology. Through experiment, the general performance of the engine is in keeping ahead in our country. With boosting mid-cooling technology and related designing correction in EQ6105 DTAA diesel engine, it had obtained better motivity and economy. The full load s teady smog emission and smog emission during simulated free accelerating are all meeting with GB14761.6-93, GB3847-1999 limit requirement. The prototype had p assed reliability test and has reliable parts. It performance indexes are in the leading position in same diesel engine in China. The 13 working conditions gas pollute and particle discharging in this pro totype can meet the limit requirement of GB17691-2001, phase I. The EQ6105DTAA diesel engine parts has good generality with existing types, which lower down th e production cost.

Improving Designs of CA6DF2 Series Diesel Combustion System

The technical improvements are made based on the former CA6110 diesel engine to meet the requirements of Euro Ⅱ emission standards. The performance and emission for CA6DF1 and CA6DF2 are all met the demand of design by improving the fuel, combustion and supercharging systems. The injection system adopts high-pressure pump-pipe-injector injection system. To enhance the injection pressure, the methods of augmenting plunger diameter, decreasing the nozzle hole diameter and reducing the inner diameter of the high-pressure fuel pipe are adopted. The design of combustion chamber and the match of inner fuel distributions with air motion are based on a great deal of experimental database and some simple computer-aided methods, which ensure the optimization of performance and provide the guide for experimental development.

Central Composite Design Method for the Preparation, Stability and Properties of Water-in-Diesel Nano Emulsions

Water in diesel nano-emulsion (WiDNE) due to their nano size, kinetically stable gives its beneficial in commercial and environmental aspects. However, the capability of this fuel strongly depends on the method of preparation, stability and their physic-chemical properties. Central composite design (CCD) method was used to optimize variable interactions in order to obtain maximum stability. Methodology RSM method with six independent variables was selected in order to understand the impacts on droplet size. The response surface and 3D plots of the quadratic polynomial model were created for studying the combination effect on response. Dynamic light scattering DLS technique was used for measuring of droplet sizes. The analysis result by ANOVA was with 95% confidence displaying F value model was 52.82. The results displayed model was fulfilled with the assumptions of ANOVA. This study has relied on Design Expert software to locate the optimum droplet size situations. The measured diameter is 26 nm, with 0.0297 errors between actual conditions and measured value. The optimum blend properties of prepared WiDNE fuel were compared with conventional diesel. Improvements in physical properties were observed in presence of water in WiDNE.

Design and Experiment for Exhaust Pipes of Pressure Wave Supercharged Diesel Engine

NOx and soot emissions from diesel engines can be greatly reduced by pressure wave supercharging(PWS).The diesel engine matched with PWS needs redesigning its exhaust pipes.Except for meeting the installation requirements,the exhaust gas must be stable in pressure before rushing into PWS.In this paper the lateral and center ported divergent exhaust pipes are designed,modeled geometrically and analyzed structurally based on a 3-D design software-CATIA to determine the structure of two exhaust pipes having the required inner volume.Then flow analysis for two exhaust pipes is done using a flow analysis software-ANASYS.Moreover,the optimal exhaust pipes are determined comprehensively and cast for engine test.Engine test results show that PWS is superior to turbocharging at low engine speeds and inferior to turbocharging in power and emissions at medium-to-high engine speeds.The performance of PWS engine under high speed operating conditions can be improved by contriving larger surge volume intake and exhaust pipes.

Full Cycle Cold Flow Analysis of the Effect of Twin Swirl Combustion Chamber Design in a Diesel Engine

New designs and adaptation methods are experimented to ensure compliance to ever increasing emissions and efficiency requirements of modern diesel engines. Piston head structure which influences the mixing rate and timing of the fuel within in the combustion chamber is known to enable increase in combustion efficiency and thus lower emission rates. In this paper, computation analysis of flow within a diesel engine cylinder with a twin swirl combustion chamber design throughout a full cycle is presented. The results obtained indicate that the effect of the twin swirl combustion chamber on the cold flow conditions is noteworthy and further analysis together with experiments may reveal information that may prove to be useful in further new designs.

SIMULATION IN THERMAL DESIGN FOR ELECTRONIC CONTROL UNIT OF ELECTRONIC UNIT PUMP

The high working junction temperature of power component is the most common reason of its failure. So the thermal design is of vital importance in electronic control unit （ECU） design. By means of circuit simulation, the thermal design of ECU for electronic unit pump （EUP） fuel system is applied. The power dissipation model of each power component in the ECU is created and simulated. According to the analyses of simulation results, the factors which affect the power dissipation of components are analyzed. Then the ways for reducing the power dissipation of power components are carried out. The power dissipation of power components at different engine state is calculated and analyzed. The maximal power dissipation of each power component in all possible engine state is also carried out based on these simulations. A cooling system is designed based on these studies. The tests show that the maximum total power dissipation of ECU drops from 43.2 W to 33.84 W after these simulations and optimizations. These applications of simulations in thermal design of ECU can greatly increase the quality of the design, save the design cost and shorten design time

Noise Control Solutions for Diesel Generator Sets

A persistent challenge for Oman's energy infrastructure was the deafening rumble of diesel generators. The Silent Generator Project addressed this challenge, developing advanced generators that deliver power quietly and efficiently. Diesel generators have historically been notorious for being noisy and vibrational, making them unsuitable for sensitive environments. To dramatically reduce noise levels, the project utilized innovative materials and design modifications to ensure reliable and quiet electricity for various applications. In all directions, the project advanced the knowledge of noise reduction through rigorous testing and meticulous integration of insulators and mufflers. As a result, quieter, more sustainable energy production is on the way, marking a major advance in silent generator technology. Furthermore, the Silent Generator Project lays the foundation for more efficient and environmentally friendly diesel generator technologies in the future. As a result of this research, a new standard for quieter, greener energy generation is established, demonstrating the critical role noise reduction plays in energy generation. Additionally, this work also suggests future diesel generator technologies that are more efficient and environmentally friendly. As a result of this research, a new standard for quieter, greener energy generation is set, demonstrating the critical role noise reduction plays in energy generation.

超高层建筑综合体消防负荷供配电系统设计

结合现行国家、行业及地方规范、标准,对超高层建筑综合体的消防负荷供配电系统、柴油发电机选择等设计方法及设计要点进行详细探讨。

船用柴油机涡轮增压叶片的计算机辅助设计优化

使用经验公式和物理试验法对涡轮增压叶片进行优化设计存在周期长、成本高的弊端,本文将计算机辅助设计方法应用到船用柴油机涡轮增压叶片设计中,完成了涡轮增压叶片二维结构、三维结构的基本设计,并对其进行气动性能仿真。使用等熵效率作为叶片优化设计的评价指标,研究了叶片进口角和等熵效率之间的关系。研究结果表明,计算机辅助设计方法可以大幅度提升设计效率,并实现了叶片设计、仿真反馈、优化设计、再反馈的闭环效果。

基于模糊分析的船用柴油机燃用生物柴油性能优化

为优化生物柴油/柴油船用发动机的综合性能,利用AVL-Fire软件构建混合燃料发动机燃烧室模型,将仿真值与台架试验值进行对比验证其准确性,并通过燃用不同比例的生物柴油确立其最佳掺混比;最后,采用正交试验设计安排5个发动机运行参数进行多参数优化匹配,将NO排放量和指示功率作为评价指标,权重分别设置为0.6和0.4,对试验结果进行模糊数学分析。结果表明:对发动机性能影响大小顺序为EGR率(a_(1))、进气压力(a_(2))、进气温度(a_(3))、喷油提前角(a_(4))、喷油孔直径(a_(5));最优参数组合为:生物柴油掺混比30%、a_(1)=12.5%、a_(2)=0.173MPa、a_(3)=315.15K、a_(4)=18.6°CA、a_(5)=0.32mm,该组指示功率为52.7kW与原机55kW相比略低,NO排放量为5.37×10^(-5)%相比于原机8.5×10^(4)%降低了94.7%。该方法可以在保证发动机动力性的前提下,大幅降低NO排放量。

基于预补偿的缸孔型线优化设计及其密封特性研究

以某非道路高压共轨柴油机为研究对象,建立了螺栓–缸盖–缸垫–缸套–机体装配耦合模型,采用仿真分析与测试相结合的方式研究了工作状态下的缸套热机耦合失圆变形。基于缸套变形结果设计了锥形、瓶颈形、纺锤形、椭圆形、椭圆纺锤复合形5种具有不同型线特征的异形缸套预补偿方案,研究了不同异形缸套的热机耦合变形量、傅里叶变形幅值及其密封与摩擦性能。研究结果表明,在第三缸的101.8 mm截面处,椭圆形方案的最大径向变形量比原机缸套减小了15.42%;椭圆形缸套的窜气量与原机缸套相比减小了1.34%,其他方案的窜气量均比原机缸套大;与原机缸套相比,纺锤形缸套和椭圆纺锤复合形缸套的机油消耗量减小了21.36%。

车用大功率柴油燃烧器的研制

针对商用车越来越严苛的NO_(x)排放法规,解决低温冷起动阶段NO_(x)的排放问题尤为重要。设计了一种车用大功率柴油燃烧器系统,用于低温冷起动过程中快速提升排气温度,使选择性催化还原器(SCR)入口温度迅速达到尿素起喷温度。详细阐述了系统方案及核心零部件的开发。利用STAR-CCM+仿真软件,对优化结构进行点火及燃烧仿真,详细分析了燃烧状态的温度分布、柴油挂壁、碳烟分布、燃烧效率、燃烧背压等。最后经过台架试验验证,冷态世界统一瞬态循环(WHTC)工况NO_(x)转换效率达97.9%,升温能力与升温速率远超常规热管理技术,同时油耗还有一定优势。

GEVO16型柴油机动力组气缸盖压装机的改进设计研究

本文针对GEVO16型柴油机动力组气缸盖压装机存在的技术问题,进行改进设计研究。首先分析了原机的技术特点及存在的问题,然后提出了相应的改进措施,并对改进后的气缸盖压装机进行了性能测试。测试结果表明,改进设计方案有效提高了气缸盖压装机的性能,降低了故障率,为柴油机行业提供了有益的参考。

基于正交试验设计的载体结构对柴油机颗粒捕集器工作特性的影响研究

为降低柴油机颗粒捕集器(diesel particulate filter,DPF)的压降并提高捕集效率,建立了DPF压降与捕集效率的数学模型,基于试验设计和多项式逼近算法,系统地研究了载体配比(x1)、壁厚(x2)及载体孔密度对DPF性能的影响。结果表明:载体配比和壁厚对压降与捕集效率影响效果显著,当载体配比和壁厚分别处于(1.40,1.53)和(0.249,0.267)mm区间时,DPF压降处于较低水平,而捕集效率相对较高,在载体配比为1.52、壁厚为0.264 mm时,压降达到最小值为4.2 kPa,捕集效率为90.28%。通过多项式逼近算法得到了压降模型和捕集效率模型的显示表达式:压降模型Y=51.19+3.815x_(1)-8.726x_(2)+3.794x_(1)^(2)-1.735x_(1)x_(2)+0.524x_(2)^(2);捕集效率模型Y=0.383+0.105x_(1)+0.085x_(2)+0.032x_(1)^(2)-0.016x_(1)x_(2)-0.0032x_(2)^(2)。DPF压降和捕集效率模型具有良好的预测精度和拟合度,压降和捕集效率的均方根误差分别为0.0110、0.0002,压降和捕集效率拟合优度分别为0.9996、0.9985。

小排量国Ⅵ柴油机涡轮增压器喘振优化设计

匹配某小排量国Ⅵ柴油机时,增压器压气机出现了喘振现象,导致发动机扭矩明显降低,需要设计一款新型压气机。通过加大压气机叶片θ角、叶片出口β角、叶片弦长、叶轮进口尺寸、叶轮出口宽度,减小扩压器出口与叶轮出口直径的比值,设计了优化方案。进行了优化方案和原方案的压气机性能仿真计算、增压器台架压气机性能试验、发动机台架增压器性能匹配试验,结果表明:优化方案改善了压气机小流量区域的稳定性,提高了堵塞流量;在发动机全转速范围内,流量减小时压比特性曲线斜率始终为负,压气机运行稳定,未发生喘振;发动机可以加载到最大设计扭矩,提升了发动机的动力性能。

自主品牌390系列大功率核电应急柴油发电机组设计概述

介绍自主品牌390型核电应急柴油发电机组项目的设计内容,对每阶段设计过程的设计输入和设计输出等情况进行描述,为后续项目提供借鉴。总结指出因该项目厂房布局及390机型本身的特点,以及在设计上与以往专利机型机组存在的不同之处,具有一定的参考意义。

发动机设计阶段维修性能力建设研究

随着各类发动机的排放升级,为保证发动机的排放能满足法规要求,发动机的零件更多,造成国内各厂家的发动机设计更趋于紧凑。发动机技术指标的不断提升,对发动机零部件可靠性、零部件之间配合与单元体之间的配合精度等要求也越来越高^([1])。但造成发动机在日常维护保养及维修过程时,维护空间较小维护困难。这样更需要发动机在设计阶段,要充分考虑发动机维护保养得便利性。本文通过研究发动机各零部件的设计寿命、设计阶段的维修性设计、样机阶段的维修性验证等,正向的保证了发动机推向市场后的维修便利性。

给水式气水混合离子发生装置对颗粒物净化的参数优化研究

铁路隧道内清筛作业中柴油机车排放尾气中含有大量的颗粒物,由于隧道内通风差,颗粒物无法及时有效地排出隧道,严重危害现场作业人员的身体健康。为此,基于气水混合离子技术,利用凝并作用去除颗粒物,设计了一种应用于柴油机车尾气的净化装置,探讨不同给水流量、不同放电电压、不同极板间距、不同放置方式和不同针尖个数对装置净化效果的影响。使用气溶胶发生器产生固态颗粒气溶胶作为污染源,在100 L实验舱中对不同影响因素进行了实验研究,结果表明:注射泵水流量为50μL/min、电压为9 200 V、极板间距为55 mm、针头个数为15个是净化装置的最优设计参数,不同放置方式无明显差别。该气水混合离子发生装置可以为净化柴油机尾气颗粒物提供新的方式。

基于回归分析的发动机HC排放预测模型

将回归分析方法用在一台经过改造的汽油/柴油双燃料发动机HC排放研究上。以1700r/min@60 N·m工况为例描述了试验设计、模型阶次选择、异常点去除、正态分布假设判断整个过程,获得了精度较高的HC排放模型,通过将试验结果和仿真分析结果进行对比验证了所建模型的正确性。

煤矿防爆柴电双动力胶轮式单臂锚杆钻车研究与设计

使用单一动力的防爆柴油机无轨辅助作业车辆在煤矿井下长时间作业会出现动力不足问题,通过开发柴柴双动力、柴电双动力和电电双动力的技术可以解决上述问题。介绍了3种双动力系统的分类和设计思路,详细阐述了防爆柴电双动力胶轮式单臂锚杆钻车的总体结构设计、支护作业动作设计、行走传动系统设计、驱动功率计算、液压系统设计、柴电双动力对液压系统的匹配分析、散热系统设计等关键技术,并对关键参数进行计算分析。通过在神东矿区实际使用表明,采用柴电双动力系统在同等作业效率下成本可节约30%以上,而且可提升整车的使用寿命;在施工过程中,设备运行平稳,各部件动作流畅,平均8~10 min可完成1套锚杆支护流程,操作员可携带遥控器在50 m范围内监控施工,试验效果符合预期。