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增压技术经几十年的实践与改进已广泛得到应用,135型柴油机已从4135、6135发展到8V 135、12V 135型,都成功地开发了增压机型,经济性明显提高。以6135型柴油机为例,在1500r/min 额定转速工况下,增压型6135ZG柴油机与非增压型6135G 柴油机相比:12h 功率由88.3kW 提高到140kW;比油耗由234g/kWh 下降到224g/kWh;机械效率由78%提高到87%。 相似文献
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中国西部大开发为汽车工业与配套动力带来巨大发展机遇,高原环境特点对发动机产生很大的影响,研究高原柴油机增压技术非常必要。研究介绍高原环境气候特点,分析高原环境对柴油机增压技术工作性能的影响,提出改善柴油机性能的技术措施。以某4缸柴油机为研究机型,对比单级增压对柴油机变海拔条件下工作特性的影响,在4km海拔下分析叶片开度对柴油机性能的影响。表明选配二级增压可提高柴油机对海拔变化适应性。低转速工况可变二级增压柴油机叶片开度在40%~70%转矩最大,有效燃油消耗率最低。增大叶片开度可降低排气背压,提高增压器效率,有效降低油耗率;中高转速时热传损失随叶片开度增大降低。 相似文献
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柴油机增压是提高柴油机功率、经济性和降低单位功率金属耗量、降低排污的有效措施,但我国中小功率柴油机增压技术的发展速度远不能适应我国建设需要,在分析原因之后,提出了增压度为1.1左右的低增压柴油机,以适应社会需求,达到推广增压柴油机之目的。并用X6130ZK增压柴油机为例,提出改进方法,其难度小,容易达到增压目标,顺利通过各项考核,为目前广大用户所接受。最后总结了匹配低增压柴油机的经验,在同行中起交 相似文献
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本文根据高负荷中增压柴油机的工作特点,在大量试验和科学分析基础上,合理的选用国产基础油和添加剂,分析了基础油和添加剂间的感受性及添加剂之间的配伍性。同时本文还考察国产CD级复合剂和美国EXXON公司生产的Paranox-390复合剂对国产基础油的感受性。利用计算机对全配方正交试验结果进行处理分析,最后得出20W/40高负荷中增压柴油机润滑油的优化配方。 相似文献
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应用振动法对柴油机气缸体上的振动信号进行分析,得出总振动量级主随活塞与气缸套磨损间隙的增大而适级放大.根据气缸体振动加速度响应功率谱图和柴油发动机总振动量级,可以确定活塞与气缸壁的间隙大小.应用油样铁谱分析技术,可以确定发动机的润滑状况及摩擦副的磨损程度和部位,并通过实例证明了其在柴油发动机故障诊断中的有效性.应用直读式原子发射光谱仪对柴油发动机润滑油油样进行检测,监控柴油发动机曲轴滑动轴承磨损状况,对保障发动机可靠运行起到很好的作用. 相似文献
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The hydraulic excavator energy-saving research mainly embodies the following three measures: to improve the performance of diesel engine and hydraulic component, to improve the hydraulic system, and to improve the power matching of diesel-hydraulic system-actuator. Although the above measures have certain energy-saving effect, but because the hydraulic excavator load changes frequently and fluctuates dramatically, so the diesel engine often works in high-speed and light load condition, and the fuel consumption is higher. Therefore, in order to improve the economy of diesel engine in light load, and reduce the fuel consumption of hydraulic excavator, energy management concept is proposed based on diesel engine cylinder deactivation technology. By comparing the universal characteristic under diesel normal and deactivated cylinder condition, the mechanism that fuel consumption can be reduced significantly by adopting cylinder deactivation technology under part of loads condition can be clarified. The simulation models for hydraulic system and diesel engine are established by using AMESim software, and fuel combustion consumption by using cylinder-deactivation-technology is studied through digital simulation approach. In this way, the zone of cylinder deactivation is specified. The testing system for the excavator with this technology is set up based on simulated results, and the results show that the diesel engine can still work at high efficiency with part of loads after adopting this technology; fuel consumption is dropped down to 11% and 13% under economic and heavy-load mode respectively under the condition of driving requirements. The research provides references to the energy-saving study of the hydraulic excavators. 相似文献
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M.H. Jones 《Wear》1979,56(1):93-103
Ferrography, developed over 10 years ago, has to date had restricted usage in the field of condition monitoring of diesel engines. A number of applications are illustrated where this technique has now been effectively utilized and reasons are also suggested for its restricted use in comparison with other existing techniques such as spectrographic oil analysis. Cases are also described where ferrography used in conjunction with spectroscopy has provided a powerful technique in the diesel engine condition monitoring field. 相似文献
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轴承是影响内燃机安全运行的重要零件,内燃机的主要运动件中,大多采用滑动轴承。滑动轴承采用流体动力润滑,曲轴的旋转作用形成油楔承载,同时零件表面对油膜挤压产生承载力。内燃机的轴承承载油膜压力由旋转油膜压力和挤压油膜压力构成。主轴瓦和连杆轴瓦在交变载荷下工作,轴承载荷的方向、大小都是周期变化的,所以轴承内不能保持均匀、恒定的承载油膜。在高速、高负荷,特别是在润滑状态不良或进入磨料时,轴承中产生较大的摩擦损失,摩擦损失转变成热量使轴承温度升高,降低润滑油粘度,使承载能力下降,再加上轴承座及轴的变形,润滑油流量不足及变质等,使轴承工作条件恶化,造成轴承损坏,如磨 相似文献