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燃烧边界条件对乙醇燃料均质压燃的影响规律
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摘要
在一台由CA6110柴油机改造而成的单缸试验机上,自主开发了进气预热系统、电控燃料喷射系统、废气再循环(EGR)系统及数据采集系统。成功的实现了乙醇燃料HCCI燃烧的测控平台。
     研究结果表明:进气温度、过量空气系数和EGR率对乙醇燃料的HCCI燃烧有重要影响。分析了进气温度、过量空气系数和EGR率对乙醇燃料HCCI燃烧的影响规律。提出了最佳进气温度的概念,确定了最佳进气温度随发动机转速和(负荷)过量空气系数的变化规律。并给出了三维MAP图。
     定义了以过量空气系数为基础的失火限制限、爆震限制限和部分燃烧限制限。给出了以过量空气系数λ和废气再循环率表示的HCCI工作范围以及以转速和平均指示压力表示的HCCI工作区域,并且研究了两种HCCI工作区域内发动机的动力性、经济性和排放性能。
     为确立HCCI燃烧的控制策略以及拓展HCCI的运转范围提供了有价值的基础数据。
Finding out a novel combustion process of petrol fuel and alternative fuels with higher heat efficiency and lower pollutant emissions than conventional engines has become one impending issue confronted to the engine researchers.
     Homogeneous Charge Compression Ignition (HCCI) is a different combustion mode comparing with conventional homogeneous charged and spark ignition gasoline engines and compressed ignition diesel engines. In this combustion mode the mixture, composing of the fuel, air and the recirculated exhaust gases (EGR), is compressed, auto-ignited, combusted. The HCCI engine is of high heat efficiency, which is approximately the same compared with diesel engines. What’s more, the emissions of the NOx and PM are quite lower because of its unique homogeneous charge and low temperature combustion process. It is likely to surmount the limitations of heat efficiency and pollutant emissions of traditional diesel and gasoline engines and become the wide using combustion mode. Because of the advantages mentioned above HCCI combustion and its controlling technologies become a worldwide hot topic in the internal combustion engine researchers.
     This study is supported by National Program on Key Basic Research Project (973) 2001CB209202. The effects of combustion conditions on ethanol fueled Homogeneous Charge Compression Ignition (HCCI) combustion were thoroughly described in this paper.
     The experimental engine was established from CA6110 prototype diesel engine. First the inlet and outlet manifolds of 6th cylinder were separated from the other 5 cylinders in order to realize unattached air-intake, air-outlet and fuel supply. Moreover, the air-intake warm-up and EGR system of 6th cylinder were developed in order to provide variable combustion conditions.
     The key hardware and software of air-intake temperature controlling system were developed and validated by air-intake warm-up experiments.
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