掺烧不同比例乙醚对船用柴油机燃烧和排放性能的影响  

Effect of Blending Different Proportions of Ether on the Performance of Combustion and Emission of Marine Diesel Engines

作　　者：杨晨曦 才正 林航 王奇伟 李品芳[1,3] 范金宇 黄加亮[1,3] YANG Chenxi;CAI Zheng;LIN Hang;WANG Qiwei;LI Pinfang;FAN Jinyu;HUANG Jialiang(School of Marine Engineering,Jimei University,Xiamen 361021,China;Quanzhou Ocean Institute,Quanzhou 362700,China;Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,Xiamen 361021,China)

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]泉州海洋职业学院,福建泉州362700 [3]福建省船舶与海洋工程重点实验室,福建厦门361021

出　　处：《集美大学学报（自然科学版）》2023年第6期534-540,共7页Journal of Jimei University：Natural Science

基　　金：福建省自然科学基金项目(2022J01812,2021J01849);福建省教育厅科技项目(JAT210237);集美大学国家自然科学基金培育项目(ZP2021008)。

摘　　要：为研究掺烧不同比例的乙醚对柴油机燃烧及排放特性的影响,以4190Z L C-2型船用中速机为研究对象,利用AVL_FIRE仿真软件构建燃烧室高压循环模型,在全负荷工况下对比实测与仿真缸压和放热率曲线,验证模型的准确性。在全负荷工况下,通过仿真模拟实验,在柴油中分别掺混体积分数为0%、5%、10%、15%的4种比例的乙醚,研究其对柴油机燃烧和排放特性的影响。结果表明:与燃烧纯柴油相比,使用柴油-乙醚混合燃料,缸内最大爆发压力和缸内最高温度均有所下降,对应的曲轴转角也稍有延后。增加乙醚的掺混比例,CO和NO的排放量均呈现降低趋势,碳烟排放略有增加。在反应过程中,乙醚加入延长了混合燃料的滞燃期,油气混合更加充分,放热过程稳定,提升柴油机的稳定性。当乙醚掺混体积分数为15%时,NO排放量较原机降低12.7%,CO排放量降低7.8%,碳烟排放量增大10.7%。In order to study the effects of blending different proportions of ether on the combustion and emission characteristics of diesel engines,the AVL_FIRE simulation software was used to construct a high-pressure cycle model of the combustion chamber with the 4190Z LC-2 medium-speed marine engine as the research object,and the cylinder pressure and exothermic rate curves of the measured and simulated models were compared under the full-load condition to validate the accuracy of the model.Under full load conditions,four proportions of ether with volume fractions of 0,5%,10%and 15%were blended in diesel fuel to study the effects on the combustion and emission characteristics of the diesel engine via simulation experiments.The results showed that,the use of diesel-ether blends resulted in a decrease in maximum in-cylinder burst pressure and maximum in-cylinder temperature,and a slight delay in the corresponding crank angle compared to those from pure diesel fuel.By increasing the proportion of ether blending,the CO and NO emissions tend to decrease,while the carbon smoke emissions increase slightly.During the reaction process,ether addition prolongs the stagnation period of the mixed fuel,the oil and gas mixing is more adequate,the exothermic process is stable,and the stability of the diesel engine is enhanced.Results also show that,when the ether blending ratio was 15%,the NO emission decreases by 12.7%,the CO emission decreases by 7.8%,and the carbon smoke emission increases by 10.7%compared to the original engine.

关 键 词：船用中速柴油机 柴油-乙醚混合燃料 燃烧及排放特性 AVL_FIRE仿真软件 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]