双燃料发动机活塞热负荷预测研究
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摘要
建立柴油—天然气双燃料发动机工作过程仿真模型,将仿真得到的环境温度和换热系数作为热负荷加载到活塞上,计算得到活塞温度场分布情况,活塞仿真温度值与实测值误差在工程允许范围内,以喷油提前角、替代率、功率、转速、NO_X排放和过量空气系数为自变量,活塞表面最高温度和活塞第一环间平均温度作为因变量,用偏最小二乘回归法建立活塞表面最高温度以及活塞环间平均温度模型。结果表明:NO_X对活塞表面最高温度及活塞环间平均温度影响最大,影响权重分别为0.30和0.31,活塞表面温度检验的最大误差值为5.7%,活塞环间平均温度的最大误差值为7.1%,基本满足工程要求,为双燃料发动机改装提供依据。
The simulation model of diesel-CNG dual-fuel engine is established.Environmental temperature and heat transfer coefficient as heat load are loaded on the piston. The temperature of the piston is obtained by simulation.The error of the simulation temperature and the measured temperature within range of the project. Injection timing, replacement rate, power, rotational speed, NO_X emission and excess air coefficient as independent variables. The maximum temperature and the first ring mean temperature of piston as dependent variables. The model of maximum temperature and first ring mean temperature of piston is established by partial least squares regression method. The results show that NO_X emission is the greatest influence factor on maximum temperature and first ring average temperature of piston, Influence weights are 0.30 and 0.31.The maximum temperature error is 5.7%, the piston ring mean temperature error is 7.1%. Which meet the engineering requirements and provides a basis for the modification of dual fuel engine.
The simulation model of diesel-CNG dual-fuel engine is established.Environmental temperature and heat transfer coefficient as heat load are loaded on the piston. The temperature of the piston is obtained by simulation.The error of the simulation temperature and the measured temperature within range of the project. Injection timing, replacement rate, power, rotational speed, NO_X emission and excess air coefficient as independent variables. The maximum temperature and the first ring mean temperature of piston as dependent variables. The model of maximum temperature and first ring mean temperature of piston is established by partial least squares regression method. The results show that NO_X emission is the greatest influence factor on maximum temperature and first ring average temperature of piston, Influence weights are 0.30 and 0.31.The maximum temperature error is 5.7%, the piston ring mean temperature error is 7.1%. Which meet the engineering requirements and provides a basis for the modification of dual fuel engine.
引文
[1] 张俊红,何振鹏,张桂昌,等.柴油机活塞热负荷和机械负荷耦合研究[J].内燃机学报,2011,29(1):78-83.Zhang Junhong,He Zhenpeng,Zhang Guichang,et al.Coupled thermal and mechanical load analysis in diesel engine piston [J].Transactions of Csice,2011,29(1):78-83.
[2] 闫军朝,李洪昌,胡建平,等.柴油机机体热―机耦合分析[J].中国农机化学报,2015,36(4):143-147.Yan Junchao,Li Hongchang,Hu Jianping,et al.Thermo-mechanical coupling analysis of diesel engine body [J].Journal of Chinese Agricultural Mechanization,2015,36(4):143-147.
[3] 闫军朝,李洪昌,胡建平,等.柴油机曲轴改进设计及有限元分析[J].中国农机化学报,2015,36(2):165-168.Yan Junchao,Li Hongchang,Hu Jianping,et al.Finite element analysis and improvement design of the diesel engine crankshaft [J].Journal of Chinese Agricultural Mechanization,2015,36(2):165-168.
[4] 雷基林,申立中,杨永中,等.4100QBZ增压柴油机活塞机械负荷与热负荷耦合分析[J].燃烧科学与计算,2008,14(1):61-66.Lei Jilin,Shen Lizhong,Yang Yongzhong,et al.Coupled thermal and mechanical load analysis in the 4100QBZ turbocharged diesel engine piston [J].Journal of Combustion Science and Technology,2008,14(1):61-66.
[5] 于文英.基于热负荷及机械负荷柴油机活塞的结构分析与仿真[D].天津:河北工业大学,2012.
[6] 张承维,肖兵,钟家明.柴油—天然气双燃料发动机替代率和喷油提前角优化[J].汽车工程,2015,37(11):1232-1239.Zhang Chengwei,Xiao Bing,Zhong Jiaming.Optimization on the replacement rate and injection timing of diesel-natural gas dual fuel engine [J].Automotive Engineering,2015,37(11):1232-1239.
[7] 张旭东,王武林,陆兆纳,等.基于GT-Power的消声器进气端盖优化分析[J].中国农机化学报,2018,39(6):39-43.Zhang Xudong,Wang Wulin,Lu Zhaona,et al.Optimization analysis of air intake cover based on GT-Power muffler [J].Journal of Chinese Agricultural Mechanization,2018,39(6):39-43.
[8] 张承维,郭华华,张生梅.喷油提前角对柴油—天然气双燃料发动机活塞热机耦合影响的仿真分析[J].中国农机化学报,2016,37(11):94-101.Zhang Chengwei,Guo Huahua,Zhang Shengmei.Thermo-mechanical coupled simulation analysis of injection timing to diesel-natural gas dual fuel engine piston [J].Journal of Chinese Agricultural Mechanization,2016,37(11):94-101.
[9] 郑彬,殷国富.农用自卸车制动蹄有限元分析及优化设计[J].中国农机化学报,2019,40(1):85-90.Zheng Bin,Yin Guofu.Finite element analysis and optimization design for brake shoe of agricultural dump truck [J].Journal of Chinese Agricultural Mechanization,2019,40(1):85-90.
[10] 祖炳锋,方强,刘捷,等.基于热机耦合的国-V柴油机活塞强度及变形数值分析[J].内燃机工程,2014,35(1):99-104.Zu Bingfeng,Fang Qiang,Liu Jie,et al.Numerical analysis of piston strength and deformation based on thermo-mechanical coupling for China-V diesel engine [J].Chinese Internal Combustion Engine Engineering,2014,35(1):99-104.
[11] 宁海强,孙平,梅德清,等.高速柴油机活塞温度试验与热力耦合仿真[J].内燃机工程,2014,35(1):105-109.Ning Haiqiang,Sun Ping,Mei Deqing,et al.Temperature experiment and thermo-mechanical coupled simulation of high-speed diesel engine piston [J].Chinese Internal Combustion Engine Engineering,2014,35(1):105-109.
[12] 常英杰,陆宪忠,王世龙,等.基于PLS的高压共轨柴油机NOX排放和最高燃烧压力模型[J].内燃机工程,2012,33(6):32-38.Chang Yingjie,Lu Xianzhong,Wang Shilong,et al.NOX emission and peak pressure models for common rail TCI engine based on PLS regression [J].Chinese Internal Combustion Engine Engineering,2012,33(6):32-38.
[13] 尧命发,黄宁,段家修,等.增压中冷柴油—天然气双燃料发动机燃烧特性的实验研究[J].内燃机学报,2003,21(4):212-216.Yao Mingfa,Huang Ning,Duan Jiaxiu,et al.Experimental investigation on combustion characteristics of turbocharged Diesel/CNG dual fuel engines with intercooler [J].Transactions of Csice,2003,21(4):212-216.
[14] 张志勇,黄荣华,王兆文,等.天然气发动机活塞稳态温度存储式测量系统[J].农业机械学报,2012,43(1):33-36.Zhang Zhiyong,Huang Ronghua,Wang Zhaowen,et al.Steady-state temperature measurement on the CNG engine piston [J].Transactions of the Chinese Society for Agricultural Machinery,2012,43(1):33-36.
[15] 朱国辉,刘敬平,柯文辉,等.汽油机燃烧放热特征参数的量化研究及简化数模开发[J].内燃机工程,2017,38(6):53-60.Zhu Guohui,Liu Jingping,Ke Wenhui,et al.Quantitive research on combustion heat release characteristics of a kind of gasoline engines and development of its simplified numerical model [J].Chinese Internal Combustion Engine Engineering,2017,38(6):53-60.
[16] 马永新,姜明月.过量空气系数对天然气发动机燃烧及排放的影响[J].内燃机与配件,2018(20):75-76.
[2] 闫军朝,李洪昌,胡建平,等.柴油机机体热―机耦合分析[J].中国农机化学报,2015,36(4):143-147.Yan Junchao,Li Hongchang,Hu Jianping,et al.Thermo-mechanical coupling analysis of diesel engine body [J].Journal of Chinese Agricultural Mechanization,2015,36(4):143-147.
[3] 闫军朝,李洪昌,胡建平,等.柴油机曲轴改进设计及有限元分析[J].中国农机化学报,2015,36(2):165-168.Yan Junchao,Li Hongchang,Hu Jianping,et al.Finite element analysis and improvement design of the diesel engine crankshaft [J].Journal of Chinese Agricultural Mechanization,2015,36(2):165-168.
[4] 雷基林,申立中,杨永中,等.4100QBZ增压柴油机活塞机械负荷与热负荷耦合分析[J].燃烧科学与计算,2008,14(1):61-66.Lei Jilin,Shen Lizhong,Yang Yongzhong,et al.Coupled thermal and mechanical load analysis in the 4100QBZ turbocharged diesel engine piston [J].Journal of Combustion Science and Technology,2008,14(1):61-66.
[5] 于文英.基于热负荷及机械负荷柴油机活塞的结构分析与仿真[D].天津:河北工业大学,2012.
[6] 张承维,肖兵,钟家明.柴油—天然气双燃料发动机替代率和喷油提前角优化[J].汽车工程,2015,37(11):1232-1239.Zhang Chengwei,Xiao Bing,Zhong Jiaming.Optimization on the replacement rate and injection timing of diesel-natural gas dual fuel engine [J].Automotive Engineering,2015,37(11):1232-1239.
[7] 张旭东,王武林,陆兆纳,等.基于GT-Power的消声器进气端盖优化分析[J].中国农机化学报,2018,39(6):39-43.Zhang Xudong,Wang Wulin,Lu Zhaona,et al.Optimization analysis of air intake cover based on GT-Power muffler [J].Journal of Chinese Agricultural Mechanization,2018,39(6):39-43.
[8] 张承维,郭华华,张生梅.喷油提前角对柴油—天然气双燃料发动机活塞热机耦合影响的仿真分析[J].中国农机化学报,2016,37(11):94-101.Zhang Chengwei,Guo Huahua,Zhang Shengmei.Thermo-mechanical coupled simulation analysis of injection timing to diesel-natural gas dual fuel engine piston [J].Journal of Chinese Agricultural Mechanization,2016,37(11):94-101.
[9] 郑彬,殷国富.农用自卸车制动蹄有限元分析及优化设计[J].中国农机化学报,2019,40(1):85-90.Zheng Bin,Yin Guofu.Finite element analysis and optimization design for brake shoe of agricultural dump truck [J].Journal of Chinese Agricultural Mechanization,2019,40(1):85-90.
[10] 祖炳锋,方强,刘捷,等.基于热机耦合的国-V柴油机活塞强度及变形数值分析[J].内燃机工程,2014,35(1):99-104.Zu Bingfeng,Fang Qiang,Liu Jie,et al.Numerical analysis of piston strength and deformation based on thermo-mechanical coupling for China-V diesel engine [J].Chinese Internal Combustion Engine Engineering,2014,35(1):99-104.
[11] 宁海强,孙平,梅德清,等.高速柴油机活塞温度试验与热力耦合仿真[J].内燃机工程,2014,35(1):105-109.Ning Haiqiang,Sun Ping,Mei Deqing,et al.Temperature experiment and thermo-mechanical coupled simulation of high-speed diesel engine piston [J].Chinese Internal Combustion Engine Engineering,2014,35(1):105-109.
[12] 常英杰,陆宪忠,王世龙,等.基于PLS的高压共轨柴油机NOX排放和最高燃烧压力模型[J].内燃机工程,2012,33(6):32-38.Chang Yingjie,Lu Xianzhong,Wang Shilong,et al.NOX emission and peak pressure models for common rail TCI engine based on PLS regression [J].Chinese Internal Combustion Engine Engineering,2012,33(6):32-38.
[13] 尧命发,黄宁,段家修,等.增压中冷柴油—天然气双燃料发动机燃烧特性的实验研究[J].内燃机学报,2003,21(4):212-216.Yao Mingfa,Huang Ning,Duan Jiaxiu,et al.Experimental investigation on combustion characteristics of turbocharged Diesel/CNG dual fuel engines with intercooler [J].Transactions of Csice,2003,21(4):212-216.
[14] 张志勇,黄荣华,王兆文,等.天然气发动机活塞稳态温度存储式测量系统[J].农业机械学报,2012,43(1):33-36.Zhang Zhiyong,Huang Ronghua,Wang Zhaowen,et al.Steady-state temperature measurement on the CNG engine piston [J].Transactions of the Chinese Society for Agricultural Machinery,2012,43(1):33-36.
[15] 朱国辉,刘敬平,柯文辉,等.汽油机燃烧放热特征参数的量化研究及简化数模开发[J].内燃机工程,2017,38(6):53-60.Zhu Guohui,Liu Jingping,Ke Wenhui,et al.Quantitive research on combustion heat release characteristics of a kind of gasoline engines and development of its simplified numerical model [J].Chinese Internal Combustion Engine Engineering,2017,38(6):53-60.
[16] 马永新,姜明月.过量空气系数对天然气发动机燃烧及排放的影响[J].内燃机与配件,2018(20):75-76.