共查询到18条相似文献,搜索用时 203 毫秒
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针对某型煤矿井下车辆用防爆柴油机的动力不足及冒黑烟问题,本文对该防爆柴油机采用了增压和中冷等技术手段,并通过台架试验对其性能进行了研究。试验结果表明:(1)优化的防爆柴油机高速区功率增加,从1900转到2300转工况下功率远远大于原机;(2)优化后的防爆柴油机低速工况下排放得到了大幅度的降低,在1200转工况点NOx排放值降幅最大,为5.4%,CO排放与原机相差不大;(3)减少防爆柴油机提前角可使NOx排放值在各工况点都有不同程度的降低;(4)优化后防爆柴油机动力性满足整车要求,排放符合煤矿柴油机标准《矿用防爆柴油机通用技术条件》的规定,可以满足煤矿井下车辆的使用。 相似文献
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针对柴油机曲柄连杆机构整体模型,采用多体动力学方法建立柴油机曲轴动力学模型,分析了不同供油提前角下曲轴主轴承动载荷的变化,仿真过程中对曲轴进行柔性处理,同时计入油膜的动力润滑作用,将不同提前角下曲轴主轴承载荷进行比较,得出供油提前角对柴油机的影响规律。 相似文献
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柴油机工作时,经常发现机体温度升高,排气管冒黑烟或白烟,耗油率增大,动力不足,易熄火,起动困难,甚至无法起动现象。当检查供油正时时,往往发现供油提前角过小。柴油机工作时出现供油提前角减小的原因主要有以下几种:1.正时齿轮系的啮合间隙过大柴油机工作时,正时齿轮系之间必然产生磨损,磨损后间隙增大,供油提前角随之减小。修理时,应检查正时齿轮系的啮合间隙,若间隙过大应成对地更换正时齿轮。2连接键损坏若正时齿轮与轴的键、联轴器接盘的键损坏,都会使高压泵凸轮轴的左右活动量增大,供油提前角减小。此时,应松开联轴… 相似文献
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12V190型柴油机的燃油系统没有采用供油提前角自动提前器,而是由人工校对后固定下来。该型柴油机转速在1000r/min时,供油提前角为32°,调整器控制转速为300~500r/min:转速在1200r/min时,供油提前角为37°,调整器控制转速为300~600r/min; 相似文献
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基于高原进排气海拔模拟系统,针对非四自吸柴油机开展变海拔的碳烟排放差异性研究,并分析高海拔碳烟排放差异的影响因素。研究表明,随着海拔的增加,柴油机碳烟排放降低,主要与高原进气量不足而降低供油量以实现低排放的标定策略相关;随着海拔的增加,柴油机的进气量、供油量与喷油提前角均降低,降幅速率约为10%/1000m, 4000m海拔的供油参数较平原的降幅超过35%;非道路移动机械因其作业的特殊性,其实际运行工况多集中于中间转速与额定转速下,该发动机相同负荷的碳烟排放相近,但额定转速下的碳烟排放较中间转速高。 相似文献
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煤矿井下防爆柴油发动机是针对煤矿井下瓦斯浓度大、空间小、通风不顺畅环境特点所引进的一种特殊发动机,其设计结构比较复杂,一旦操作失误容易引发安全隐患。为此,文章在阐述柴油机原理、过程、构造的基础上,结合一般性柴油发动机使用缺陷来分析煤矿井下防爆柴油机的应用优势,并从温度、电气元件、火星消除、零部件材料的选择应用几个方面具体分析如何优化煤矿井下防爆柴油发动机的设计。 相似文献
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使用传感器、数据采集卡和虚拟仪器软件改进柴油/乙醇双燃料发动机的乙醇喷射电子控制系统,通过三个供油提前角、四个供醇时刻组合的全因素试验,比较了双燃料发动机与原机相同工况下的性能。结果表明,双燃料发动机的动力性、经济性和烟度与原机相比均有不同程度的改善。 相似文献
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研究了小波包能量谱分析和能量谱分析在某柴油机故障诊断中的应用。以柴油机的供油提前角减小2.5°和空气滤清器堵塞2种故障为例,把用2种方法提取的特征向量作为神经网络的输入特征,然后进行故障诊断。对比测试结果得出能量谱分析法的实用性强于小波包能量谱分析法。 相似文献
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通过柴油发动机台架实验和行车实验,分析了不同工况下自制纳米WS2车用机油添加剂在柴油发动机中的应用效果。结果表明,在FC2000柴油发动机台架上应用时,纳米WS2车用机油添加剂在不同转速和不同负载下均能在一定程度上降低发动机油耗率,减少发动机尾气中NOx含量和颗粒物含量,并且当发动机转速为1 700r/min,负载为70N.m时,节油率最高为9.95%,颗粒物减排率最高为49.3%,而当发动机处于低速、高速、低载和高载等工况时,NOx减排率较高,最高达到36%;在柴油机大客车上应用时,纳米WS2车用机油添加剂使其耗油量下降约14.4%,并能在一定程度上降低发动机的运行噪声,使发动机的有害气体(NOx)排放减少34.8%~51%。综合表明纳米WS2车用机油添加剂具有良好的节能减排效果。 相似文献
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Bhupendra Singh Chauhan Naveen Kumar Haeng Muk Cho 《Journal of Mechanical Science and Technology》2010,24(2):529-535
Diesel engines have proven their utility in the transportation, agriculture, and power sectors in India. They are also potential
sources of decentralized energy generation for rural electrification. Concerns on the long-term availability of petroleum
diesel and the stringent environmental norms have mandated the search for a renewable alternative to diesel fuel to address
these problems. Vegetable oils have been considered good alternatives to diesel in the past couple of years. However, there
are many issues related to the use of vegetable oils in diesel engine. Jatropha curcas has been promoted in India as a sustainable
substitute to diesel fuel. This study aims to develop a dual fuel engine test rig for evaluating the potential suitability
of Jatropha oil as diesel fuel and for determining the performance and emission characteristics of an engine with Jatropha
oil. The experimental results suggest that engine performance using Jatropha oil is slightly inferior to that of diesel fuel.
The thermal efficiency of the engine was lower, while the brake-specific fuel consumption was higher with Jatropha oil compared
with diesel fuel. The levels of nitrogen oxides (NOx) from Jatropha oil during the entire duration of the experiment were
lower than those of diesel fuel. The reduction of NOx was found to be an important characteristic of Jatropha oil as NOx emission
is the most harmful gaseous emission from engines; as such, its reduction is always the goal of engine researchers and makers.
During the entire experiment, carbon monoxide (CO), hydrocarbon (HC), and carbon dioxide (CO2) emissions in the case of using Jatropha oil were higher than when diesel fuel was used. The higher density and viscosity
of Jatropha oil causes lower thermal efficiency and higher brakespecific fuel consumption. The performance and emission characteristics
found in this study are significant for the study of replacing diesel fuel from fossils with Jatropha oil in rural India,
where the availability of diesel has always been a problem. 相似文献
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The combustion and heat release of engines using diesel fuel and bio-diesel fuel have been investigated. The results illustrate that the combustion happens in advance and the ignition delay period is shortened. The initial heat release peak declines a little, the corresponding crankshaft angle changes in advance, and the combustion duration is prolonged. The economic performance and emission features of diesel engines using diesel fuel and bio-diesel fuel are compared. The results also show that the specific fuel consumption of bio-diesel increases by about 12% .The emissions, such as CO, HC, and particulate matter decrease remarkably whereas NOx increases a little. 相似文献