共查询到19条相似文献,搜索用时 74 毫秒
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柴油/CNG双燃料发动机开发及其性能分析 总被引:1,自引:0,他引:1
在CA6113BZS-60柴油机的基础上,设计开发了CA6113BN-01柴油/CNG双燃料发动机,并对开发的双燃料发动机进行了动力性能和经济性能的实验与分析.结果表明,开发的混合器混合和机械控制引燃柴油量及由进气管压力调节控制天然气量的双燃料发动机,具有全负荷速度特性扭矩储备大及各种负荷下天然气替代率变化较小,综合柴油替代率高,结构简单和成本低等优点,并具有良好的动力性能和经济性能指标,操作性好,可随时恢复纯柴油运行并能够基本保持原柴油机的性能. 相似文献
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YC6108天然气/柴油双燃料改型发动机的性能研究 总被引:2,自引:0,他引:2
本文介绍CY6108Q型柴油机改装为天然气/柴油双燃料发动机的有关情况。试验研究结果表明,虽然对原机的改动不大,但改装后的双燃料发动机与原机相比,动力性却略有提高,排气烟度也大幅度地改善,油气转换方便,并具有良好的可操作性,安全性和可靠性,双燃料发动机的性能基本达到了设计目标,。 相似文献
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基于数值模拟计算方法,对淄柴6230型中速船用柴油机燃用天然气的燃烧系统进行优化。结果表明:在压缩比为11~14时,功率和热效率随压缩比递增且趋势不变,但受最高燃烧压力的限制,最佳压缩比取12.5。适当增大过量空气系数和提前喷油时刻都有助于NOx排放的减少,最低NOx排放可达0.817 g/(kW·h),但当过量空气系数超过2.0、喷油时刻早于-20°时燃烧会急剧恶化。引燃油量对燃烧过程影响较小,在研究范围内,指示热效率增幅仅为0.85%,但过富的喷油量会造成额外的NOx和HC排放,因此取1%为最佳喷油量。 相似文献
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针对LPG/柴油双燃料发动机的动力性进行了研究。与燃用柴油相比,在相同热能消耗的情况下,掺烧液化石油气后,发动机的输出功率会增加,亦即发动机的动力性在掺气后会提高。随着掺比的增加,动力性上升,达到一定掺比时,动力性又开始下降,但仍高于燃用纯柴油时的动力性。试验结果表明,在掺比为20%~30%时,发动机的输出功率最高。 相似文献
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Cheolwoong Park Seunghyun ParkYonggyu Lee Changgi KimSunyoup Lee Yasuo Moriyoshi 《International Journal of Hydrogen Energy》2011,36(16):10080-10088
In this study, an experimental investigation on a naturally aspirated (NA), 8-L spark ignition engine fueled by biogas with various methane concentrations - which we called the N2 dilution test - was performed in terms of its thermal efficiency, combustion characteristics and emissions. The engine was operated at a constant engine rotational speed of 1800 rpm under a 60 kW power output condition and simulated biogas was employed to realize a wide range of changes in heating value and gas composition. The N2 dilution test results show that an increase of inert gas in biogas was beneficial to thermal efficiency enhancement and NOx emission reduction, while exacerbating THC emissions and cyclic variations. Then, as a way to achieve stable combustion for the lowest quality biogas, H2 addition tests were carried out in various excess air ratios. H2 fractions ranging from 5 to 30% were blended to the biogas and the effects of hydrogen addition on engine behavior were evaluated. The engine test results indicated that the addition of hydrogen improved in-cylinder combustion characteristics, extending lean operating limit as well as reducing THC emissions while elevating NOx generation. In terms of efficiency, however, a competition between enhanced combustion stability and increased cooling energy loss was observed with a rise in H2 concentration, maximizing engine efficiency at 5-10% H2 concentration. Moreover, based on the peak efficiency operating point, a set of optimum operating conditions for minimum emissions with the least amount of efficiency loss was suggested in terms of excess air ratio, spark ignition timing, and hydrogen addition rate as one of the main results. 相似文献
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天然气/柴油双燃料发动机燃烧过程的模拟计算 总被引:1,自引:0,他引:1
详细介绍了天然气/柴油双燃料发动机的二维数学模型,并对一台单缸双燃料发动机燃烧过程进行了模拟计算,将计算结果与实验结果对比分析发现,该模型的计算结果与试验数据有良好的一致性。 相似文献
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基于试验的方法研究等热值法、理论等空气消耗量法和实际等空气消耗量法3种不同的计算方法对发动机动力性、经济性及排放特性的影响。试验结果表明:等热值法和理论等空气消耗量法对发动机的性能影响差异较小,各工况差异低于5%。实际等空气消耗量法确定的天然气供给量能明显提升发动机动力性,平均增加动力42.33%。不同天然气供给量计算方法在未对燃料供给进行优化时,未能有效降低发动机有效燃料消耗率,在大负荷工况有效燃料消耗率偏差平均为6.85%。双燃料模式下NOx排放得到明显改善,HC+NOx排放在中、高负荷工况时能满足排放限值要求,CO排放在低转速工况满足排放限值要求。 相似文献
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喷油提前角是影响柴油机动力性能的一个重要参数。文章通过AVLBoost软件进行柴油机模拟计算,通过实验验证计算与实验结果吻合良好。研究了喷油提前角对柴油机动力性能的影响,提出本实验用柴油机的最佳喷油提前角为10℃ABTDC。 相似文献