米勒循环与EGR耦合对增压柴油机性能的影响

韩雷; 任洪娟

doi:10.12299/jsues.22-0007

米勒循环与EGR耦合对增压柴油机性能的影响

doi: 10.12299/jsues.22-0007

韩雷,
任洪娟^,

上海工程技术大学机械与汽车工程学院, 上海 201620

详细信息

作者简介:
韩雷：韩　雷（1996−），男，在读硕士，研究方向为内燃机节能减排. E-mail：ray_h1112@163.com

通讯作者:
任洪娟（1978−），女，副教授，博士，研究方向为汽车动力系统设计与节能减排. E-mail：ren-hongjuan@163.com

中图分类号: TK421
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出版历程
- 收稿日期: 2022-01-07
- 刊出日期: 2022-06-30

Influence of Miller cycle and EGR coupling on performance of turbocharged diesel engine

HAN Lei,
REN Hongjuan^,

School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

摘要

摘要:
以某6缸四冲程两级增压船用柴油机为研究对象，建立两级增压柴油机米勒循环与废气再循环(Exhaust Gas Recirculation, EGR)耦合仿真模型，研究米勒循环和EGR耦合对两级增压柴油机燃油消耗率和NO_x排放的影响. 结果表明，当米勒度为−40°CA时，燃油消耗率相对原机降低3.5%，NO_x排放相对原机降低25.5%；EGR率为30%时，燃油消耗率相对原机增加5.0%，NO_x排放降低98.7%；当米勒度为−30°CA与EGR率为20%时，燃油消耗率相对原机仅增加0.1%，NO_x排放降低92.7%.
- 米勒循环 /
- 废气再循环 /
- 船用柴油机 /
- 两级涡轮增压 /
- NO_x排放
Abstract:
Taking a 6-cylinder, four-stroke, two-stage turbocharged marine diesel engine as the research object, the coupled simulation model of Miller cycle and exhaust gas recirculation (EGR) of two-stage turbocharged diesel engine was established, and the influences of Miller cycle and EGR coupling on the fuel consumption rate and NO_x emissions of the two-stage turbocharged diesel engine were studied. The results show that when the Miller timing is −40°CA, compared with the original engine, the fuel consumption rate is reduced by 3.5%, and the NO_x emissions are reduced by 25.5%. When the EGR rate is 30%, the fuel consumption rate is increased by 5.0% and NO_x emissions are reduced by 98.7%. When the Miller timing is −30°CA and EGR rate is 20%, compared with the original engine, the fuel consumption rate is only increased by 0.1% and NO_x emissions are reduced by 92.7%.
- Miller cycle /
- exhaust gas recirculation (EGR) /
- marine diesel engine /
- two-stage turbocharging /
- NO_x emissions

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图 1 试验系统布置

Figure 1. Test system layout

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图 2 船用柴油机推进特性曲线

Figure 2. Marine diesel engine propulsion characteristic curve

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图 3 两级增压柴油机仿真模型（带EGR）

Figure 3. Simulation model of two-stage turbocharged diesel engine with EGR

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图 4 米勒度方案

Figure 4. Scheme of Miller timing

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图 5 柴油机性能随米勒度的变化规律

Figure 5. Variation of diesel engine performance with Miller timing

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图 6 柴油机性能随EGR率的变化规律

Figure 6. Variation of diesel engine performance with EGR rates

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表 1 柴油机主要技术参数

Table 1. Main technical parameters of diesel engine

参数	数值
机型	四冲程，直列6缸
气缸直径/mm	170
行程/mm	222
连杆长度/mm	379
排量/L	30.22
压缩比	15.5:1
点火顺序	1→5→3→6→2→4
最大爆发压力/MPa	25
低压级增压器转速/(r·min⁻¹)	≤75000
高压级增压器转速/(r·min⁻¹)	≤80000
中冷后空气温度/℃	45 ± 5
喷孔数	8
喷孔直径/mm	0.3

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表 2 主要试验数据

Table 2. Main experimental datas

参数	数值
功率/kW	507.7
转速/(r·min⁻¹)	1365
转矩/(N·m)	3557.2
燃油消耗率/(g·(kW·h)⁻¹)	213.2
进气流量/(kg·h⁻¹)	4612.6
进气温度/℃	28.7
NO_x排放量/(g·(kW·h)⁻¹)	15.3

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