共查询到17条相似文献,搜索用时 671 毫秒
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为了提高某V型发动机冷却性能,对该机原冷却水套模型结构分5个阶段进行了改进,包括加大左右侧排气端气缸垫通道面积,增加气缸盖和气缸体水套通道,开通气缸盖水套排气侧中间断口。利用Ricardo三维流体软件VECTIS对原水套和每阶段改进水套进行了三维数值模拟计算,并进行了比较分析。结果表明,最终改进后的水套流动性能比原水套有明显的改善。 相似文献
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为满足日益严格的全球燃油经济性要求,流量主动控制、缸间钻孔和快速加热等各种先进的发动机冷却技术得以应用。韩国现代汽车公司最近开发了新一代2.0L4缸汽油机,采用了几种新的冷却系统技术。从概念设计阶段到预生产阶段,总结了三维计算机辅助工程(CAE)分析在发动机冷却性能评价中的应用。对缸盖和缸体水套中的冷却液流动进行了研究,找出了最佳方案,并通过优化缸垫孔对其进行了进一步的改进。在制造首台试验发动机之前,进行了三维温度模拟,以满足工程样机阶段的开发标准。为降低发动机温度或提高生产率,在新开发的发动机上研究并实施了一些水套的设计,如快速加热的缸体水套隔板、集成EGR 冷却器的缸体、集成排气歧管的缸盖等。这些设计在试验阶段呈现了良好的效果。采用了三维热流CAE分析,对各系统进行了详细的物理现象研究,并提出了解决方案。结果表明,新一代发动机的冷却系统具有足够的热稳定性。 相似文献
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发动机冷却水套内三维流动的数值模拟研究 总被引:4,自引:0,他引:4
应用FIRE软件对某一发动机冷却水套进行了三维数值模拟,得到了冷却液流场速率、换热系数分布、压力损失以及流量分布等流场信息。从计算结果中发现,该发动机缸体水套的第2缸、第3缸等区域存在流动死区.水套进、排气侧流量分布相差较大.整体水套压力损失与同类机型相比偏小等不合理的流动现象,是导致其第2缸、第3缸“拉缸”的主要原因。最后提出了相应的解决方案。 相似文献
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降低摩托车排气噪声的试验研究 总被引:2,自引:0,他引:2
排气噪声是摩托车最主要噪声源之一,对某125摩托车进行了整车噪声评价声源识别、对其不带消声器而带空管的发动机排气噪声进行了频谱分析并对消声器消声性能做过改进试验和分析计算,结果表明,该摩托车主要噪声源仍为排气噪声;改进的 声 消声效果优于原消声器消声效果。 相似文献
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K. -B. Kim K. -W. Choi K. -H. Lee 《International Journal of Automotive Technology》2012,13(3):401-407
A relatively new approach for improving fuel economy and automotive engine performance involves the use of automotive combined
cycle generation technologies. The combined cycle generation, a process widely used in existing power plants, has become a
viable option for automotive applications due to advances in materials science, nanotechnology, and MEMS (Mico-Electro Mechanical
Systems) devices. The waste heat generated from automotive engine exhaust and coolant is a feasible heat source for a combined
cycle generation system, which is basically a Rankine cycle in the context of this study. However, there are still numerous
technical issues that need to be solved before the technology can be implemented in automobiles. A simulation was performed
to examine the amount of waste energy that could be recovered through the use of a combined cycle system. A simulation model
of the Rankine cycle was developed using Cycle-Tempo software. The simulation model was ultimately used to evaluate the rate
of waste heat recovery and the consequential increase in the overall thermal efficiency of the engine with the combined cycle
generation system under typical engine operating conditions. The most effective automotive combined cycle system recovered
68% of the waste heat from the exhaust and coolant, resulting in a 6% improvement in engine efficiency. The results are expected
to be beneficial for evaluating the feasibility of combined cycle generation systems in automotive applications. 相似文献
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Active coolant control strategies in automotive engines 总被引:1,自引:0,他引:1
K. B. Kim K. W. Choi K. H. Lee K. S. Lee 《International Journal of Automotive Technology》2010,11(6):767-772
The coolant flow rate in conventional cooling systems in automotive engines is subject to the mechanical water pump speed,
and high efficiency in terms of fuel economy and exhaust emission is not possible given this limitation. A new technology
must be developed for engine cooling systems. The electronic water pump is used as a substitute for the mechanical water pump
in new engine cooling systems. The new cooling system provides more flexible control of the coolant flow rate and engine temperature,
which previously relied strongly on engine driving conditions such as load and speed. In this study, the feasibility of two
new cooling strategies was investigated using a simulation model that was validated with temperatures measured in a diesel
engine. Results revealed that active coolant control using an electronic water pump and valves substantially contributed to
a reduction of coolant warm-up time during cold engine starts. Harmful emissions and fuel consumption are expected to decrease
as a result of a reduction in warm-up time. 相似文献
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内燃机能量流试验是评估不同控制策略下内燃机能耗和指明其改善方向的重要方法。通过试验对1台涡轮增压缸内直喷汽油机进行了基于冷却液温度的能量平衡分析,基于热力学定律,将能量平衡项分为有效功、冷却液损失、排气损失和通过辐射传热产生的未计入热损失。结果表明:小负荷时,随着冷却液温度的升高,燃油消耗率略有下降,NO_x排放量增加;全工况下,HC排放量随着冷却液温度的升高而减少,CO和CO_2排放量变化不大;有效功占比和排气损失占比随负荷的增大而增大,几乎不受冷却液温度的影响;冷却液损失占比随冷却液温度的升高而减小。 相似文献
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SY492Q-1型发动机(130系列和2125系列汽车的配套动力)原机燃用70号(马达法)汽油。采用正交试验法,对该机燃用90号(研究法)汽油时的压缩比,比油器主要孔及点火提前角等进行了优选试验,并与原机的动力性,经济性和排放进行了对比分析。 相似文献
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A numerical engine mapping methodology is proposed for the engine performance and fuel consumption map generation. An integrated model is developed by coupling a single cylinder GT-Power® engine model with a MATLAB/ Simulink® based boost system model to simulate a turbocharged diesel engine over the entire engine operating speed and load ranges within reasonable computational constraints. A single cylinder engine model with the built-in multi-zone combustion modeling option in GT-Power® is configured as a predictive engine model. The cycle averaged simulation result from the engine model is used as the boundary conditions of the boost system including intake and exhaust manifolds and a turbocharger. The boost system model developed in MATLAB/Simulink® platform calculates the intake and exhaust conditions which are fed back to the engine model. The integrated system model predicts the performance and fuel consumption of a turbocharged diesel engine with better predictive capability than mean value engine models. Its computational time is fast enough to simulate the engine over the entire engine operation range compared to multi-cylinder engine models. 相似文献