不同海拔条件下柴油燃烧火焰温度和碳烟特性研究

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doi:10.15918/j.tbit1001-0645.2022.039

何旭^{1, 2,},
徐雨轩¹,
许锴¹,
刘泽昌¹,
向祺¹,
张朝¹,
魏巍^{1, 3,,}

1.
bob手机在线登陆机械与车辆学院，北京　100081
2.
北京电动汽车协同创新中心，北京　100081
3.
华北水利水电大学机械学院，河南，郑州　450045

基金项目:国家自然科学基金资助项目（51976012）

详细信息

作者简介:
何旭（1976—），男，副教授，博士，E-mail：hhexxu@bit.edu.cn

通讯作者:
魏巍（1986—），男，讲师，博士，E-mail：gengrong88@163.com

中图分类号:TK421.2
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- HTML全文浏览量:52
- PDF下载量:20
- 被引次数:0
出版历程
- 收稿日期:2022-02-24

Flame Temperature and Soot Characteristics of Diesel Combustion at Different Altitudes

HE Xu^{1, 2,},
XU Yuxuan¹,
XU Kai¹,
LIU Zechang¹,
XIANG Qi¹,
ZHANG Zhao¹,
WEI Wei^{1, 3,,}

1.
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2.
Collaborative Innovation Center of Electric Vehicles in Beijing , Beijing 100081, China
3.
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China

摘要

摘要:为了研究海拔条件对柴油机冷起动阶段柴油燃烧过程的影响，在定容燃烧弹台架上模拟了平原和海拔2000 m工况下柴油机缸内的热力学状态，利用双色法获取了不同工况下柴油火焰温度和表征碳烟浓度的 KL因子分布. 结果表明，随着海拔由0 m增加至2000 m，环境温度、压力同时降低产生了耦合作用，导致柴油滞燃期由2.0 ms增大至3.13 ms.海拔升高后，柴油燃烧过程中平均火焰温度降低，局部高温区域消失， KL因子总量减少. 海拔条件变化影响了碳烟特性和火焰温度的关系. 随着海拔升高，火焰温度降低，导致碳烟氧化主导阶段碳烟氧化速率降低，局部火焰温度对局部碳烟浓度的影响减小.
- 柴油机/
- 燃烧/
- 双色法/
- 火焰温度/
- 碳烟特性/
- 海拔
Abstract:To study the altitude effects on the diesel combustion process under cold-start condition, the thermodynamic state of the diesel engine cylinder was simulated in a constant volume combustion chamber under the plain condition and the 2000 m altitude condition. Flame temperature and KLfactor distribution for soot concentration characterizing were obtained by the two-color method under different conditions. Results show that the simultaneous decrease of ambient temperature and pressure can produce a coupling effect, resulting in the diesel ignition delay from 2.0 ms to 3.13 ms increasing, when the altitude increases from 0 m to 2000 m. As the altitude increases, the average flame temperature decreases during the diesel combustion process, while the local high temperature area disappears and the total KLfactor decreases. The relationship between soot characteristics and flame temperature is affected evidently with altitude increases. With the increase of altitude and the decrease of flame temperature, the soot oxidation rate decreases in the soot oxidation dominated process and the impact of local flame temperature on local soot concentration weakens.
- diesel engine/
- combustion/
- two-color method/
- flame temperature/
- soot characteristics/
- altitude

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图 1定容燃烧弹系统示意图

Figure 1.Schematic of constant volume combustion chamber (CVCC)

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图 2不同工况下的滞燃期

Figure 2.Ignition delay under different conditions

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图 3不同工况下的平均火焰温度

Figure 3.Average flame temperature under different conditions

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图 4不同工况下的火焰温度区间分布图

Figure 4.Flame temperature distribution under different conditions

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图 5不同工况下的KL因子总量

Figure 5.IntegratedKLfactor under different conditions

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图 6不同工况下的KL因子区间分布

Figure 6.KLfactor distribution under different conditions

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图 7不同工况下KL因子总量与平均火焰温度关系

Figure 7.The relationship of integratedKLfactor and average flame temperature under different conditions

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图 8不同工况下的KL因子与火焰温度空间对应关系

Figure 8.KLfactor versus flame temperature of each pixel under different conditions

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表 1试验工况

Table 1.Test conditions

试验参数	数值
环境温度T_am/K	815/840
绝对环境压力p_am/MPa	2.7/3.1/3.4
冷却水温度T_c/K	293
喷嘴孔径d₀/mm	0.16
喷射压力P_inj/MPa	60
喷油持续期t_inj/ms	2.7

下载: 导出CSV

表 2工况表

Table 2.Condition table

工况序号	T_am/K	p_am/MPa	对应海拔/m
a	840	3.4	0
b	815	3.4
c	840	2.7
d	815	2.7	2000

下载: 导出CSV

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