不同自燃模式对压力波动形成的影响

续晗; 姚春德; 姚安仁

doi:10.11883/1001-1455(2016)03-0407-09

不同自燃模式对压力波动形成的影响

doi: 10.11883/1001-1455(2016)03-0407-09

1.
天津大学内燃机燃烧学国家重点实验室，天津 300072
2.
天津大学材料科学与工程学院，天津 300072

基金项目:

国家自然科学基金项目 51176135

详细信息

作者简介:
续晗(1990-)，男，博士研究生

通讯作者:
姚春德, arcdyao@tju.edu.cn

中图分类号: O382
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- 被引次数: 0
出版历程
- 收稿日期: 2014-10-08
- 修回日期: 2014-12-26
- 刊出日期: 2016-05-25

Effect of different auto-ignition modeson the formation of pressure waves

Xu Han¹,
Yao Chunde^{1
, ,},
Yao Anren²

1.
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2.
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

摘要

摘要: 在内燃机中，HCCI(均值混合气压燃)爆震、汽油机常规爆震、汽油机超级爆震都是由未燃混合气自燃引起的化学能突然释放，从而产生振荡燃烧，但其压升率及压力振荡幅值却截然不同。为了阐明其中机理，根据上述的带震荡的燃烧压力波变化规律，提出以实验测得的放热率为基础的“能量注入法”，建立了3种自燃模式。通过对能量方程中的热源项进行分类改变，进而对3种自燃模式进行数值模拟、对其产生的压力波动进行比较分析。模拟结果表明，不同震荡特征的燃烧压力波源于不同的自燃模式，从而导致其宏观表现的压升率以及压力波振荡幅值有极大的差异。以放热率为基础的“能量注入法”能准确、快捷地探究内燃机燃烧室中压力波的形成与传播。
- 爆炸力学 /
- 自燃 /
- 爆震 /
- 压力波动 /
- 放热率
Abstract: In internal combustion engines, different combustion technologiescan result in different knocks, such as the conventional knock of gasoline engines, the super knock and the knock of HCCI engines.Though they are all caused by the auto-ignition of unburned mixture which leads to the oscillation burning, the rising rate and the oscillation amplitude of their pressure are totally different. In order to explore the inner mechanism working behind them, three kinds of auto-ignition modes were built up to illustrate the different phenomena of pressure oscillations under different combustion technologies. The differences of these three kinds of auto-ignition modes in engines were clarified. In the method of "Energy Injected", the heat source term of the energy equation can be changed based on the heat release rate obtained from experiments, and then a series of numerical simulations were conducted to realize these three kinds of auto-ignition modes. The numerical simulation shows that different auto-ignition modes will lead to different pressure waves, which can explain the different pressure rising rate and pressure oscillation amplitude. The method of "Energy Injection" based on the experiment measured heat release rate can accurately and rapidly identify the formation and propagation of pressure waves in the engine combustion chamber.
- mechanics of explosion /
- auto-ignition /
- knock /
- pressure oscillation /
- heat release rate

HTML全文

图 1 锥顶型燃烧室物理模型简化

Figure 1. The simplification of cone roofed combustion chamber

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图 2 超级爆震缸压曲线及放热率曲线^[9]

Figure 2. The in-cylinder pressure curve and heat release rate curve of super knock

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图 3 压力初始条件

Figure 3. Initial condition of the pressure

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图 4 温度初始条件

Figure 4. Initial condition of the temperature

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图 5 3种自燃模式下的缸压曲线

Figure 5. Cylinder pressure under three kinds of autoignition mode

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图 6 不同自燃模式下的p_MAPO值和I_KI值

Figure 6. Value of p_MAPO and I_KI in different autoignition modes

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图 7 不同自燃模式下不同时刻的压力云图

Figure 7. Pressure contour of different auto-ignition modes at different times

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参考文献(11)

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