某型高速大功率船用柴油机燃烧优化
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摘要
针对某型高速大功率船用柴油机存在的排气烟度大、油耗率偏高的问题,采用台架试验与燃烧仿真相结合的方式进行优化研究。利用油泵台架试验和气道稳流台架试验为燃烧仿真提供边界条件,并通过燃烧仿真对柴油机的燃烧过程进行分析。仿真确定优化方案,并对优化方案进行柴油机台架试验验证。研究结果表明:全工况燃油消耗率和排气烟度有较大幅度降低,其中,部分工况燃油消耗率降低10 g/(k W·h),烟度降低48.4%,NOX排放满足船用柴油机IMO TierⅡ排放法规的要求。
For the problem of excessive smoke and high fuel consumption in the marine high-speed high-power diesel engine,the optimization was conducted based on bench test and combustion simulation. Fuel injection system bench test and intake port blower bench test were used to provide accurate boundary conditions for the combustion simulation. The combustion process was analyzed based on the simulation. The optimal solution was validated on the engine test bench. The test results indicated that the fuel consumption and smoke are reduced significantly. Fuel consumption at one operating point is reduced by 10 g/( kW·h),and smoke is reduced by 48. 4%. NOx satisfies IMO Tier Ⅱ requirement.
For the problem of excessive smoke and high fuel consumption in the marine high-speed high-power diesel engine,the optimization was conducted based on bench test and combustion simulation. Fuel injection system bench test and intake port blower bench test were used to provide accurate boundary conditions for the combustion simulation. The combustion process was analyzed based on the simulation. The optimal solution was validated on the engine test bench. The test results indicated that the fuel consumption and smoke are reduced significantly. Fuel consumption at one operating point is reduced by 10 g/( kW·h),and smoke is reduced by 48. 4%. NOx satisfies IMO Tier Ⅱ requirement.
引文
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[10]闫萍,冯明志,平涛,等.喷孔参数对高压共轨船用柴油机燃烧与排放影响的仿真研究[J].内燃机工程,2011,32(3):43-47.
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[12]李钦奉,丁飞,刘博,等.喷油器参数对船用低速机燃烧特性影响的仿真研究[J].船舶工程,2015,37(5):27-30,105.
[13]刘镇,常汉宝,邵利民.舰用高压共轨柴油机燃烧与排放的仿真计算[J].武汉理工大学学报(交通科学与工程版),2006(1):17-20.
[14]邵利民,安士杰,常汉宝.高压共轨柴油机燃烧与排放的仿真计算及分析[J].内燃机工程,2005,26(3):1-4.
[15]KHAN S,PANUA R,BOSE P K.Combined effects of piston bowl geometry and spray pattern on mixing,combustion and emissions of a diesel engine:a numerical approach[J].Fuel,2018,225:203-217.
[16]LI X,CHEN Y,SU L,et al.Effects of lateral swirl combustion chamber geometries on the combustion and emission characteristics of DI diesel engines and a matching method for the combustion chamber geometry[J].Fuel,2018,224:644-660.
[2]RAKOPOULOS C D,KOSMADAKIS G M,PARIOTIS E G.Investigation of piston bowl geometry and speed effects in a motored HSDI diesel engine using a CFD against a quasidimensional model[J].Energy conversion and management,2010,51(3):470-484.
[3]刘琦,欧阳光耀,杨昆,等.可调靴形喷油规律的燃烧排放性能仿真研究[J].中南大学学报(自然科学版),2016,47(2):667-675.
[4]朱坚,黄晨,尧命发.燃烧室几何形状对柴油机燃烧过程影响的数值模拟研究[J].内燃机工程,2007(2):14-18.
[5]杜宪峰,闫鹏斌,严伟,等.喷油孔直径对柴油机燃烧及排放的影响[J].机械设计与制造,2018(1):44-47.
[6]LI X,ZHOU H,SU L,et al.Combustion and emission characteristics of a lateral swirl combustion system for DI diesel engines under low excess air ratio conditions[J].Fuel,2016,184:672-680.
[7]SU L,LI X,HE X,et al.Experimental research on the diffusion flame formation and combustion performance of forced swirl combustion system for DI diesel engines[J].Energy conversion and management,2015,106:826-834.
[8]LI X,GAO H,ZHAO L,et al.Combustion and emission performance of a split injection diesel engine in a double swirl combustion system[J].Energy,2016,114:1135-1146.
[9]陈占耀,贾义,李亚楠,等.降低非道路用柴油机排放试验[J].河南科技大学学报(自然科学版),2017,38(3):30-34,40.
[10]闫萍,冯明志,平涛,等.喷孔参数对高压共轨船用柴油机燃烧与排放影响的仿真研究[J].内燃机工程,2011,32(3):43-47.
[11]解方喜,洪伟,阎朝亮,等.预喷射对增压柴油机高负荷燃烧和排放的影响[J].燃烧科学与技术,2010,16(1):69-73.
[12]李钦奉,丁飞,刘博,等.喷油器参数对船用低速机燃烧特性影响的仿真研究[J].船舶工程,2015,37(5):27-30,105.
[13]刘镇,常汉宝,邵利民.舰用高压共轨柴油机燃烧与排放的仿真计算[J].武汉理工大学学报(交通科学与工程版),2006(1):17-20.
[14]邵利民,安士杰,常汉宝.高压共轨柴油机燃烧与排放的仿真计算及分析[J].内燃机工程,2005,26(3):1-4.
[15]KHAN S,PANUA R,BOSE P K.Combined effects of piston bowl geometry and spray pattern on mixing,combustion and emissions of a diesel engine:a numerical approach[J].Fuel,2018,225:203-217.
[16]LI X,CHEN Y,SU L,et al.Effects of lateral swirl combustion chamber geometries on the combustion and emission characteristics of DI diesel engines and a matching method for the combustion chamber geometry[J].Fuel,2018,224:644-660.