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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Optimization of the injection parameters of a diesel/natural gas dual fuel engine with multi-objective evolutionary algorithms
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Optimization of the injection parameters of a diesel/natural gas dual fuel engine with multi-objective evolutionary algorithms

机译：多目标进化算法柴油/天然气双燃料发动机注射参数的优化

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摘要

In this study, the injection parameters of a High-Pressure Direct-Injection (HPDI) natural gas engine was optimized by coupling a multi-dimensional computational fluid dynamics (CFD) code with the genetic algorithm (GA). Moreover, the analysis of the combustion and emission characteristics of a diesel/natural gas dual fuel engine are performed in this paper with the introduction of the diesel/natural gas dual fuel injection model into the CFD code. The result reveals that the developed gas fuel injection model is capable to predicate the penetrations of the natural gas injection. For the dual fuel engine with simultaneous reduction of NOx and soot, the optimized diesel injection timing is at -15.2 degrees CA ATDC, the gas injection timing is around -6.0 degrees CA ATDC, and the circumferential offset angle between the diesel and natural gas nozzle hole is around 8.8 degrees. The lowest ISFC condition is achieved when the injection interval between the diesel and natural gas is 1.38 degrees CA. For the high soot emissions cases, the gas injection timings are later compared with the other cases. In the dual fuel engine, most of the NO emissions are generated through the combustion of the direct injected natural gas. Soot formation region is mainly located in the squish volume close to the cylinder walls, where the temperature is low which leads to a lower soot oxidation rate.
机译：在该研究中，通过耦合具有遗传算法（GA）的多维计算流体动力学（CFD）代码来优化高压直喷（HPDI）天然气发动机的注射参数。此外，通过将柴油/天然气双燃料喷射模型引入CFD码，在本文中进行了对柴油/天然气双燃料发动机的燃烧和排放特性的分析。结果表明，发育的气体燃料喷射模型能够谓的天然气喷射的渗透。对于具有NOx和烟灰同时缩小的双燃料发动机，优化的柴油喷射正时位于-15.2摄氏度，气体喷射正时约为-6.0度Ca ATDC，柴油和天然气喷嘴之间的周向偏移角度孔约为8.8度。当柴油和天然气之间的喷射间隔为1.38度CA时，实现最低的ISFC条件。对于高烟灰排放案例，随后与其他情况进行比较。在双燃料发动机中，大部分没有排放通过直接注入的天然气的燃烧产生。烟灰形成区域主要位于靠近圆柱壁的鳞状体积，其中温度低，从而导致较低的烟灰氧化速率。

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