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internal exhaust gas recirculation
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  “internal exhaust gas recirculation”译为未确定词的双语例句
     In order to gain internal exhaust gas recirculation using bigger negativeoverlapped angle of inlet and exhaust to achieve gasoline engines' HCCI combustion.
     为了能利用进、排气门重叠负角获得气缸内部残余废气实现汽油机的HCCI燃烧,本文设计并加工了具有小持续角的进、排气凸轮轴。
短句来源
  相似匹配句对
     On the Exhaust Muffler of Internal Combustion Engine
     内燃机排气消声器的试验研究
短句来源
     SIMULATION AND PREDICTION OF EXHAUST NOISE FOR INTERNAL COMBUSTION ENGINES
     内燃机排气噪声谱的模拟研究
短句来源
     Internal Control
     内部控制专题
短句来源
     Internal Control
     一种全新的内部控制观探析
短句来源
     EFFECT OF NEGATIVE IONS GENERATOR ON REDUCING EXHAUST GAS FROM INTERNAL COMBUSTION ENGINE
     负离子发生器对柴油机减废的作用
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This paper analyzes the sources of unburned hydrocarbons(UHC) and CO from two-stroke homogeneous charge spark ignition (SI) engines,describing an approach with the potential to substantially reduce UHC and CO in this system based on the experiments carried out on a two-stroke engine in idle condition with high levels of internal exhaust gas recirculation (EGR). By increasing internal EGR in a spark ignited two-stroke engine at idle, UHC was reduced from 7 800×10~(-6) to 3 000×10~(-6), CO was reduced...

This paper analyzes the sources of unburned hydrocarbons(UHC) and CO from two-stroke homogeneous charge spark ignition (SI) engines,describing an approach with the potential to substantially reduce UHC and CO in this system based on the experiments carried out on a two-stroke engine in idle condition with high levels of internal exhaust gas recirculation (EGR). By increasing internal EGR in a spark ignited two-stroke engine at idle, UHC was reduced from 7 800×10~(-6) to 3 000×10~(-6), CO was reduced from 3% to 0.2%, and cyclic variability was reduced as well. Increased EGR allowed active species in the burned gases to react with the fresh charge well in advance of the first stage ignition. The results that stable engine operation can be obtained with additional internal EGR. Similar results were obtained in stoichiometric and lean conditions. Further experimental and model results indicate that the main source of UHC and CO emissions is the fuel trapped in crevices,which suggests that the combustion temperature is not the main factor affecting UHC and CO. The critical factor is the pre-ignition reaction that occurs in the cylinder prior to the first stage of auto-ignition.The importance of active species is confirmed by experiments where air or N_2 with similar quantities to real EGR are used to dilute the charge. It was found that spark ignition was possible with real EGR but not possible with either air or N_2.

分析了二冲程均质发动机UHC和CO的来源,介绍了一种能够大幅度降低UHC和CO的方法.试验是在二冲程发动机怠速废气再循环量较大情况下进行的,怠速时,通过在SI二冲程发动机上增加EGR,发现UHC从7800×10-6降低到3000×10-6,CO从3%降低到0.2%,循环变动也减小了.EGR中的活性物质与新鲜充量充分反应改善了预燃过程.由此证明,可以通过增加EGR实现发动机稳定运行,并在当量比和稀燃条件下得到了同样结果.试验表明,UHC和CO主要来自余隙中的残余燃料,说明燃烧温度不是影响UHC和CO的主要因素,决定因素是第一阶段燃烧前缸内发生的预燃反应程度.活性物质的重要性已被试验证实,试验中用氮气和空气代替EGR稀释混合气,发现火花点火在EGR中是可行的,在空气和氮气中却不行.

This paper described the effects of internal exhaust gas recirculation (EGR) based on the low and intermediate temperature degenerate chain branching chemical mechanism, examined the possibility of spark ignition and stable combustion under high internal EGR conditions, demonstrated the importance of preignition reactions in advance of the first stage ignition,introduced a potential method to reduce UHC and CO, analyzed the sources of unburned hydrocarbon (UHC) and CO, key features of the study were...

This paper described the effects of internal exhaust gas recirculation (EGR) based on the low and intermediate temperature degenerate chain branching chemical mechanism, examined the possibility of spark ignition and stable combustion under high internal EGR conditions, demonstrated the importance of preignition reactions in advance of the first stage ignition,introduced a potential method to reduce UHC and CO, analyzed the sources of unburned hydrocarbon (UHC) and CO, key features of the study were that the connection between the preignition chemistry and reliable spark ignition, steady flame propagation, and reduction of UHC and CO emission has been established.Experimental and model results indicated that the main source of UHC and CO emission was the fuel trapped in crevices, and the combustion temperature was not the main factor affecting UHC and CO, instead, the critical factor was the extent of the preignition reactions that occur in the cylinder prior to the first stage of autoignition.

在中、低温化学反应分解链的基础上阐明了内部废气再循环 (EGR)的作用 ,试验了火花点火和稳定燃烧在高 EGR水平时的可能性 ,证实了第一阶段着火之前预燃反应的重要性 ,分析了未燃碳氢化合物 (U HC)和CO的来源 ,指出了降低 UHC和 CO排放的有效方法 ,将预燃反应和可靠的火花点火、稳定的火焰传播与减少UHC和 CO排放有效地联系在一起。指出了 UHC和 CO主要来自燃烧室余隙中的燃料 ,证实了影响 U HC和 CO排放的主要因素不是燃烧温度。

Diesel-fueled homogeneous charge compression ignition (HCCI) is achieved by using fuel injection near intake top dead center(TDC) and large internal exhaust gas recirculation (EGR) rates. This method benefits fuel vaporization and mixing. The difficulties of HCCI engine cold-start can be solved by using the secondary injector to inject the pilot fuel prior to compression TDC. Good performance of HCCI combustion can be achieved at normal intake temperature. The effects of engine load and inlet temperature...

Diesel-fueled homogeneous charge compression ignition (HCCI) is achieved by using fuel injection near intake top dead center(TDC) and large internal exhaust gas recirculation (EGR) rates. This method benefits fuel vaporization and mixing. The difficulties of HCCI engine cold-start can be solved by using the secondary injector to inject the pilot fuel prior to compression TDC. Good performance of HCCI combustion can be achieved at normal intake temperature. The effects of engine load and inlet temperature on HCCI combustion are studied, which indicates that the change of cylinder temperature is the reason resulting in the change of HCCI combustion.

提出了采用在进气上止点附近进行燃油喷射,通过内部EGR促进燃油蒸发混合的方法,实现柴油燃料的均质压燃(HCCI),并通过副喷嘴喷射引燃柴油解决HCCI发动机的冷启动困难问题.试验表明该方法有利于在缸内形成均质混合气,在常温进气的情况下就可得到较好的HCCI燃烧效果.同时,还对影响HCCI燃烧的发动机负荷和进气温度进行了研究,认为由这些因素引起的缸内温度变化是影响HCCI燃烧的主要原因.

 
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