两缸增压中冷柴油机排气压力波动与影响因素研究
发布时间：2018-07-31 11:09
【摘要】：两缸柴油机采用360°CA发火间隔角,在工作周期中会出现进气和排气空档角,导致进排气压力波动较大,引起充量系数和涡轮效率的下降。针对某两缸增压中冷柴油机较大的排气压力波动问题,建立了两缸柴油机整机一维模型与排气歧管三维模型,应用一维与三维耦合模拟计算的方法,对发动机在不同转速下一个工作循环的排气管内的气体流动特性、波动规律及排气压力波动的影响因素进行了分析。研究结果表明:在全负荷工况下,发动机转速从1 000~2 200 r/min时,排气压力波动强度由1.82增加到3.56,涡轮效率波动强度由0.12减小到0.02;转速从2 200~4 000 r/min时,排气压力波动强度由3.56减小到1.52,涡轮效率波动强度趋于稳定状态为0.02;排气总管的长度与直径、排气提前角对低转速涡轮效率有显著影响。
[Abstract]:Two cylinder diesel engine adopts 360 掳CA firing interval angle, and the intake and exhaust gap angle will appear in the working cycle, which leads to large fluctuation of intake and exhaust pressure, resulting in the decrease of charging coefficient and turbine efficiency. Aiming at the large exhaust pressure fluctuation of a two-cylinder turbocharged and intercooled diesel engine, a one-dimensional model and a three-dimensional model of exhaust manifold for a two-cylinder diesel engine are established, and the method of one-dimensional and three-dimensional coupling simulation is applied. In this paper, the gas flow characteristics, fluctuation law and influencing factors of exhaust pressure fluctuation in an exhaust pipe of a working cycle under different engine speeds are analyzed. The results show that under the full load condition, the exhaust pressure fluctuation intensity increases from 1.82 to 3.56, the turbine efficiency fluctuation intensity decreases from 0.12 to 0.02, and the rotational speed changes from 2 200 to 4 000 r/min when the engine speed changes from 1 000 to 2 200 r/min, the exhaust pressure fluctuation intensity increases from 1. 82 to 3. 56, and the turbine efficiency fluctuation intensity decreases from 0. 12 to 0. 02. The fluctuation intensity of exhaust pressure decreases from 3.56 to 1.52and the fluctuation intensity of turbine efficiency tends to be 0.02.The length and diameter of exhaust manifold and the exhaust advance angle have significant effects on the turbine efficiency at low speed.
【作者单位】： 昆明理工大学云南省内燃机重点实验室;昆明云内动力股份有限公司;
【基金】：云南省教育厅重大资助项目(ZD2013007) 国家自然科学基金资助项目(51466003)
【分类号】：TK42
本文编号：2155397
[Abstract]:Two cylinder diesel engine adopts 360 掳CA firing interval angle, and the intake and exhaust gap angle will appear in the working cycle, which leads to large fluctuation of intake and exhaust pressure, resulting in the decrease of charging coefficient and turbine efficiency. Aiming at the large exhaust pressure fluctuation of a two-cylinder turbocharged and intercooled diesel engine, a one-dimensional model and a three-dimensional model of exhaust manifold for a two-cylinder diesel engine are established, and the method of one-dimensional and three-dimensional coupling simulation is applied. In this paper, the gas flow characteristics, fluctuation law and influencing factors of exhaust pressure fluctuation in an exhaust pipe of a working cycle under different engine speeds are analyzed. The results show that under the full load condition, the exhaust pressure fluctuation intensity increases from 1.82 to 3.56, the turbine efficiency fluctuation intensity decreases from 0.12 to 0.02, and the rotational speed changes from 2 200 to 4 000 r/min when the engine speed changes from 1 000 to 2 200 r/min, the exhaust pressure fluctuation intensity increases from 1. 82 to 3. 56, and the turbine efficiency fluctuation intensity decreases from 0. 12 to 0. 02. The fluctuation intensity of exhaust pressure decreases from 3.56 to 1.52and the fluctuation intensity of turbine efficiency tends to be 0.02.The length and diameter of exhaust manifold and the exhaust advance angle have significant effects on the turbine efficiency at low speed.
【作者单位】： 昆明理工大学云南省内燃机重点实验室;昆明云内动力股份有限公司;
【基金】：云南省教育厅重大资助项目(ZD2013007) 国家自然科学基金资助项目(51466003)
【分类号】：TK42
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，本文编号：2155397
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