正丁醇/柴油混合燃料和活塞碗形结构对压燃式发动机燃烧和排放特性的影响。
Effect of n-butanol/diesel blends and piston bowl geometry on combustion and emission characteristics of CI engine.
机构信息
Department of Mechanical Engineering, National Institute of Technology Warangal, Warangal, India.
Department of Mechanical Engineering, National Institute of Technology Andhra Pradesh, Tadepalligudam, India.
出版信息
Environ Sci Pollut Res Int. 2019 Jan;26(2):1661-1674. doi: 10.1007/s11356-018-3704-5. Epub 2018 Nov 17.
The present study describes the experimental and numerical analysis of the combustion and emission characteristics of CI engine operated with diesel-butanol blends. Experiments were carried with neat diesel fuel (i.e., Bu00) and its blends of n-butanol, 10%, 20% and 30% by volume (Bu10, Bu20 and Bu30) at a constant speed and rated load. From the experimental results, it is observed that CO, NO and smoke emissions decreased, whereas the unburned hydrocarbon (UBHC) emission increased with increasing butanol content, as compared to Bu00. From the experimental analysis, it is also observed that Bu20 blend gives higher brake thermal efficiency (BTE) and lower brake specific energy consumption (BSEC) as compared to Bu00, Bu10 and Bu30, but produces higher UBHC. In order to decrease the UBHC emission, different piston bowl geometries were analysed using simulation studies. The combustion and emission characteristics of the CI engine operating with Bu20 blend for three different piston bowl geometries viz., hemispherical combustion chamber (HCC), shallow combustion chamber (SCC) and toroidal combustion chamber (TCC), were studied using CONVERGE CFD code. The simulation model was validated with experimental results of the baseline engine configuration (HCC) for diesel fuel as well as Bu20 blend. The results showed that there is a significant reduction in UBHC and improvement of performance for SCC and TCC piston geometry compared to HCC piston geometry. However, a slight increment of NO emissions was observed.
本研究描述了使用柴油-丁醇混合物运行的 CI 发动机的燃烧和排放特性的实验和数值分析。实验使用纯柴油（即 Bu00）及其 n-丁醇的混合物，体积比为 10%、20%和 30%（Bu10、Bu20 和 Bu30），在恒定速度和额定负载下进行。从实验结果可以看出，与 Bu00 相比，随着丁醇含量的增加，CO、NO 和烟尘排放减少，而未燃烧的碳氢化合物（UBHC）排放增加。从实验分析中还可以看出，与 Bu00、Bu10 和 Bu30 相比，Bu20 混合物的制动热效率（BTE）更高，制动比能消耗（BSEC）更低，但产生的 UBHC 更高。为了降低 UBHC 排放，使用模拟研究分析了不同的活塞碗几何形状。使用 CONVERGE CFD 代码研究了运行 Bu20 混合物的 CI 发动机的燃烧和排放特性，对于三种不同的活塞碗几何形状，即半球形燃烧室（HCC）、浅燃烧室（SCC）和环形燃烧室（TCC）。模拟模型与基础发动机配置（HCC）的实验结果进行了验证，该配置使用柴油燃料以及 Bu20 混合物。结果表明，与 HCC 活塞几何形状相比，SCC 和 TCC 活塞几何形状可以显著降低 UBHC 和提高性能，但观察到 NO 排放略有增加。
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