超长冲程低速柴油机换气过程的双区域仿真建模
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摘要
为了研究船用超长行程二冲程直流扫气柴油机的扫气特性,本文采用以"混合-分层"理论为基础的组合换气模型模拟二冲程柴油机的换气过程,在Matlab/Simulink平台上建立相应的换气过程模型,并对该模型进行了实验验证。利用扫气空气质量流量确定"混合-分层"模型中的比例系数,并根据比例系数计算出船用超长行程低速柴油机的扫气效率等特性参数,研究了不同比例系数对二冲程柴油机换气过程的影响。研究结果表明:本文建立的二冲程柴油机换气过程模型,能精确模拟直流扫气柴油机的换气过程,并结合实验数据预测二冲程柴油机扫气过程的特性参数,为后续整机建模提供基础。
To study the scavenging characteristics of a super-long-stroke,uniflow-scavenging two-stroke uniflowscavenged diesel engine,this paper presents a combined model based on the " mixed-layered" theory to simulate the gas exchange process of a two-stroke diesel. AnA gas exchange model was established by Matlab/Simulink and then verified by an experiment. The proportional coefficient of the " mixed-layered" model was determined by the mass flow of sweeping air,and then scavenging characteristic parameters,likesuch as the sweeping efficiency of marine super-long-stroke low-speed diesel engine,were calculated according to the proportional coefficient. Besides In addition,the influence of different proportional coefficientcoefficients on the gas exchanging process of a twostroke diesel engine was investigated. ResultThe result shows that the simulation model in this paper can accurately simulate the gas exchanging process of uniflow-scavenged diesel engines,and predict the scavenging characteristics byin combination with the experimental data,whichcan predict the scavenging characteristics; therefore,the study provides thea basis for the subsequent overall engine modelingling.
To study the scavenging characteristics of a super-long-stroke,uniflow-scavenging two-stroke uniflowscavenged diesel engine,this paper presents a combined model based on the " mixed-layered" theory to simulate the gas exchange process of a two-stroke diesel. AnA gas exchange model was established by Matlab/Simulink and then verified by an experiment. The proportional coefficient of the " mixed-layered" model was determined by the mass flow of sweeping air,and then scavenging characteristic parameters,likesuch as the sweeping efficiency of marine super-long-stroke low-speed diesel engine,were calculated according to the proportional coefficient. Besides In addition,the influence of different proportional coefficientcoefficients on the gas exchanging process of a twostroke diesel engine was investigated. ResultThe result shows that the simulation model in this paper can accurately simulate the gas exchanging process of uniflow-scavenged diesel engines,and predict the scavenging characteristics byin combination with the experimental data,whichcan predict the scavenging characteristics; therefore,the study provides thea basis for the subsequent overall engine modelingling.
引文
[1]刘啸波,任慧龙,李陈峰.世界及我国船用低速柴油机行业发展研究[J].船舶工程,2013,35(1):1-4.LIU Xiaobo,REN Huilong,LI Chenfeng. Research of industry development of low-speed marine diesel engine at home and abroad[J]. Ship engineering,2013,35(1):1-4.
[2]LIU Haiqiang,LU Lin,WANG Zhongjun. Evaluation analysis of scavenging process of two-stroke marine diesel engine by experiment and simulation[J]. Journal of thermal science and technology,2014,9(2):JTST0012.
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[6]陈欠根,张祥剑,潘钟键,等.二冲程柴油航空发动机混和扫气数值仿真[J].科技导报,2014,32(22):23-28.CHEN Qiangen,ZHANG Xiangjian,PAN Zhongjian,et al.Numerical simulation of mixed scavenging methods for twostroke diesel aero engines[J]. Science&technology review,2014,32(22):23-28.
[7]刘永长.对定压二程机完全“混合-分层”组合换气模型的修正[J].内燃机工程,1985(01):33-41.LIU Yongchang. A modification to the fully“mixed-layers”formed compound scavenging model in a two-stroke diesel engine with constant pressure charging[J]. Chinese internal combustion engine engineering,1985(01):33-41.
[8]SHER E. Modeling the scavenging process in the two-stroke engine-an overview[R]. SAE International Congress and Exposition,1989.
[9]刘锋华.船用二冲程低速柴油机性能匹配优化研究[D].上海交通大学,2014.LIU Fenghua. Study on performance matching and optimization of two-stroke low-speed marine diesel engine[D].Shanghai Jiao Tong University,2014.
[10]LAMAS M I,RODR? GUEZ VIDAL C G. Computational fluid dynamics analysis of the scavenging process in the MAN B&W 7S50MC two-stroke marine diesel engine[J].Journal of ship research,2012,56(3):154-161.
[11]刘永丰,明平剑,张文平,等.内燃机三维CFD数值模拟程序开发[J].工程热物理学报,2013(10):1944-1947.LIU Yongfeng,MING Pingjian,ZHANG Wenping,et al.Development of 3D CFD simulation program for internal combustion engine[J]. Journal of engineering thermophysics,2013(10):1944-1947.
[12]顾宏中.涡轮增压柴油机性能研究[M].上海:上海交通大学出版社,1998:19-23.
[13]石磊,丰琳琳,周涌明,等.船用二冲程柴油机鼓风机扫气模型与切换规律研究[J].内燃机工程,2012,33(05):31-35.SHI Lei,FENG Linlin,ZHOU Yongming,et al. Research of scavenging model and blower switching for two-stroke marine diesel engine[J]. Chinese internal combustion engine engineering,2012,33(05):31-35.
[14]顾宏中,涡轮增压柴油机热力过程模拟计算[M].上海交通大学出版社,1985.
[15]王海燕,张旭升,胡以怀.基于零维燃烧模型的二冲程船用柴油机性能预测[J].内燃机学报,2016,34(6):549-555.WANG Haiyan,ZHANG Xusheng,HU Yihuai. Performance prediction for two-stroke marine diesel engine based on zero-dimensional combustion model[J]. Transactions of CSICE,2016,34(6):549-555.
[16]刘永长.内燃机热力过程模拟[M].北京:机械工业出版社,2001.
[17]TANG Yuanyuan,ZHANG Jundong,GAN Huibing,et al.Development of a real-time two-stroke marine diesel engine model with in-cylinder pressure prediction capability[J].Applied energy,2017,194:55-70.
[18]LIU Yuhang,ZHANG Fujun,ZHAO Zhenfeng,et al. The effects of pressure difference on opposed piston two stroke diesel engine scavenging process[J]. Energy procedia,2017,142:1172-1178.
[2]LIU Haiqiang,LU Lin,WANG Zhongjun. Evaluation analysis of scavenging process of two-stroke marine diesel engine by experiment and simulation[J]. Journal of thermal science and technology,2014,9(2):JTST0012.
[3]YUM K K,TASKAR B,PEDERSEN E,et al. Simulation of a two-stroke diesel engine for propulsion in waves[J]. International journal of naval architecture and ocean engineering,2017,9(4):351-372.
[4]SIGURDSSON E,INGVORSEN K M,JENSEN M V,et al.Numerical analysis of the scavenge flow and convective heat transfer in large two-stroke marine diesel engines[J].Applied energy,2014,123:37-46.
[5]NESHAT E,HONNERY D,SARAY R K. Multi-zone model for diesel engine simulation based on chemical kinetics mechanism[J]. Applied thermal engineering,2017,121:351-360.
[6]陈欠根,张祥剑,潘钟键,等.二冲程柴油航空发动机混和扫气数值仿真[J].科技导报,2014,32(22):23-28.CHEN Qiangen,ZHANG Xiangjian,PAN Zhongjian,et al.Numerical simulation of mixed scavenging methods for twostroke diesel aero engines[J]. Science&technology review,2014,32(22):23-28.
[7]刘永长.对定压二程机完全“混合-分层”组合换气模型的修正[J].内燃机工程,1985(01):33-41.LIU Yongchang. A modification to the fully“mixed-layers”formed compound scavenging model in a two-stroke diesel engine with constant pressure charging[J]. Chinese internal combustion engine engineering,1985(01):33-41.
[8]SHER E. Modeling the scavenging process in the two-stroke engine-an overview[R]. SAE International Congress and Exposition,1989.
[9]刘锋华.船用二冲程低速柴油机性能匹配优化研究[D].上海交通大学,2014.LIU Fenghua. Study on performance matching and optimization of two-stroke low-speed marine diesel engine[D].Shanghai Jiao Tong University,2014.
[10]LAMAS M I,RODR? GUEZ VIDAL C G. Computational fluid dynamics analysis of the scavenging process in the MAN B&W 7S50MC two-stroke marine diesel engine[J].Journal of ship research,2012,56(3):154-161.
[11]刘永丰,明平剑,张文平,等.内燃机三维CFD数值模拟程序开发[J].工程热物理学报,2013(10):1944-1947.LIU Yongfeng,MING Pingjian,ZHANG Wenping,et al.Development of 3D CFD simulation program for internal combustion engine[J]. Journal of engineering thermophysics,2013(10):1944-1947.
[12]顾宏中.涡轮增压柴油机性能研究[M].上海:上海交通大学出版社,1998:19-23.
[13]石磊,丰琳琳,周涌明,等.船用二冲程柴油机鼓风机扫气模型与切换规律研究[J].内燃机工程,2012,33(05):31-35.SHI Lei,FENG Linlin,ZHOU Yongming,et al. Research of scavenging model and blower switching for two-stroke marine diesel engine[J]. Chinese internal combustion engine engineering,2012,33(05):31-35.
[14]顾宏中,涡轮增压柴油机热力过程模拟计算[M].上海交通大学出版社,1985.
[15]王海燕,张旭升,胡以怀.基于零维燃烧模型的二冲程船用柴油机性能预测[J].内燃机学报,2016,34(6):549-555.WANG Haiyan,ZHANG Xusheng,HU Yihuai. Performance prediction for two-stroke marine diesel engine based on zero-dimensional combustion model[J]. Transactions of CSICE,2016,34(6):549-555.
[16]刘永长.内燃机热力过程模拟[M].北京:机械工业出版社,2001.
[17]TANG Yuanyuan,ZHANG Jundong,GAN Huibing,et al.Development of a real-time two-stroke marine diesel engine model with in-cylinder pressure prediction capability[J].Applied energy,2017,194:55-70.
[18]LIU Yuhang,ZHANG Fujun,ZHAO Zhenfeng,et al. The effects of pressure difference on opposed piston two stroke diesel engine scavenging process[J]. Energy procedia,2017,142:1172-1178.