本文基于TBD234V6型增压中冷柴油机，采用AVL-fire软件对柴油机额定工况下不同进气道加湿水油比进行三维数值模拟研究，对比分析该技术对柴油机缸内爆压、缸内温度、缸内温度场、燃烧放热率、NOX浓度、Soot浓度及NOX和Soot浓度场的影响，并通过灰色决策理论结合主客观赋权法确定最优水油比。结果表明：随着水油比的增加，相比于原型机，其爆压先升高后降低，水油比0.5时出现拐点，爆压上升幅度最大，约4.19%。且缸内温度降低，放热率峰值升高且出现时刻逐渐后移，燃油消耗率呈先下降后上升的趋势，NOX排放量降低明显，Soot排放量呈先降低后升高的趋势。通过计算确定1.5为最优水油比，此时，爆压下降约1.01%，燃油消耗率下降2.35%，NOX排放降低83.69%，Soot排放上升9.42%。研究结果可为船用柴油机掺水燃烧提供一定指导依据。
This paper is based on the TBD234V6 turbocharged and intercooled diesel engine, using AVL-fire software to carry out a three-dimensional numerical simulation study of different inlet humidification water-oil ratios under rated operating conditions of the diesel engine, and comparative analysis The influence of this technology on the explosion pressure, in-cylinder temperature, in-cylinder temperature field, combustion heat release rate, NOX concentration, Soot concentration, and NOX and Soot concentration fields of diesel engine is determined by the gray decision theory combined with subjective and objective weighting method. Excellent water-oil ratio. The results show that as the water-oil ratio increases, compared with the prototype, the explosion pressure first increases and then decreases. When the water-oil ratio is 0.5, an inflection point appears, and the explosion pressure rises the most, about 4.19% and the temperature in the cylinder decreases. The peak heat release rate rises and the time of occurrence gradually shifts back. The fuel consumption rate first declines and then rises, the NOX emissions decrease significantly, and the Soot emissions show a trend that first decreases and then increases. After that, through calculations, it was determined that 1.5 was the optimal water-fuel ratio. At this time, the explosion pressure dropped by about 1.01%, the fuel consumption rate dropped by 2.35%, NOX emissions dropped by 83.69%, and Soot emissions increased by 9.42%. The research results can provide certain guidance basis for water-blended combustion of marine diesel engines.
2022,44(22): 89-95 收稿日期：2021-08-05
DOI：10.3404/j.issn.1672-7649.2022.22.016
分类号：TK427
基金项目：福建省自然科学基金资助项目（2019J01705）
作者简介：高占斌(1971-),男,博士,教授,主要从事内燃机性能、增压和排放研究
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