Combustion characteristics of a lean-burned CBM engine with hydrogen direction injection

International journal of energy science Pub Date : 2022-12-01 DOI:10.54097/ije.v1i1.3227

W. Jia

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Abstract

A 3D model of a CBM engine was established, and the combustion modes under different injection parameters and ignition matching conditions were studied by using methane PFI+ hydrogen DI injection method. Flame propagation, flame structure and engine indication thermal efficiency under the three combustion modes were analyzed. The results show that when the interval between injection and ignition is less than 10°CA, the flame structure of plume ignition will be formed; when the interval between injection and ignition is greater than 10°CA and less than 16°CA, the flame form of concentration stratification will be formed; when the interval is greater than 16°CA, the homogeneous flame structure will be formed. The flame propagation speed of plume ignition is significantly higher than that of the other two combustion modes. Under the three combustion modes, the injection and ignition schemes are adjusted several times. When the injection time is -8°CA ATDC and the ignition time is -2°CA ATDC, the flame structure is the plume ignition structure. The indicated thermal efficiency is higher than the other two combustion modes, and the indicated thermal efficiency of the engine is up to 52.8%.

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定向喷氢稀燃煤层气发动机的燃烧特性

建立了某型煤层气发动机的三维模型，采用甲烷PFI+氢气DI喷射方式，研究了不同喷射参数和点火匹配条件下的燃烧模式。分析了三种燃烧模式下的火焰传播、火焰结构和发动机指示热效率。结果表明:当喷射与点火的间隔小于10°CA时，会形成羽流点火的火焰结构;当喷燃间隔大于10°CA小于16°CA时，会形成浓度分层的火焰形态;当间隔大于16°CA时，将形成均匀的火焰结构。羽流点火的火焰传播速度明显高于其他两种燃烧方式。在三种燃烧模式下，喷射和点火方案进行了多次调整。当喷射时间为-8°CA ATDC，点火时间为-2°CA ATDC时，火焰结构为羽流点火结构。指示热效率高于其他两种燃烧方式，发动机的指示热效率可达52.8%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International journal of energy science

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