| 摘要:针对某Tier Ⅲ船用低速二冲程柴油机，开展了负荷、EGR率及喷油参数对放热率及其特征参数的影响研究。研究表明:负荷和轨压是影响燃烧始点的主要因素，负荷、轨压升高使燃烧始点提前；轨压升高及喷油正时提前使CA50提前，指示热效率升高；小EGR率对燃烧过程影响不大，EGR率高于26%后会显著推迟CA50，增大燃烧持续期，降低指示热效率。基于实测放热率对三韦伯函数参数进行了研究，获得了多因素对经验放热模型的作用规律，得到了适用于低速机的经验放热率模型。 |
| 关键词: 低速二冲程柴油机 放热率 经验模型 三韦伯函数 |
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| Research on Heat Release Rate Empirical Model of the Low-SpeedTwo-Stroke Engine Based on Experimental Fitting |
| Liu Bo,Ma Tianyi,Qian Yuehua,Shi Lei,Deng Kangyao |
| China Shipbuilding Power Engineering Institute Co, Ltd., Shanghai 200120;Collaborative InnovationCenter for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240 |
| Abstract:Based on a Tier Ⅲ marine low-speed two-stroke diesel engine，the effects of load, EGR rate and fuel injection parameters on the heat release rate and its characteristic parameters are studied. The research shows that the load and rail pressure are the main factors affecting the start of combustion,load and higher rail pressure lead to earlier combustion starting point; higher rail pressure and earlier injection timing lead to earlier CA50 so that the indicated thermal efficiency is increased; small EGR rate has less influence on the combustion process until EGR rate is higher than 26%, at which point CA50 is significantly postponed, the combustion duration is increased, and the indicated thermal efficiency is lowered. Based on mesured heat release rates, three-Wiebe function was studied, the influence rule of multi-factors on heat release empirical model was discovered, and the empirical model suitable for low-speed engines was obtained. |
| Key words: low-speed two-stroke diesel engine heat release rate empirical model three-Wiebe function |
