Effect of the thermal stratification on SI–CAI hybrid combustion in a gasoline engine
Effect of the thermal stratification on SI–CAI hybrid combustion in a gasoline engine
复制标题
热分层对汽油发动机 SI–CAI 混合燃烧的影响
DOI：
10.1016/j.applthermaleng.2013.07.049
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发表时间：
2013-11
影响因子：
6.4
通讯作者：
Hua Zhao
中科院分区：
文献类型：
--
作者：
Le Li;Liyan Xie;Tao Chen;Hua Zhao
本研究通过实验和CFD模拟研究了热分层对SI-CAI混合燃烧特性的影响。实验结果表明，提高冷却液温度和进气温度均能增大峰值放热速率，缩短燃烧持续时间，而改变进气温度的控制能力更为显著。燃烧特性变化的相对敏感性(R)表明，进气温度对燃烧初期的影响更大，冷却液温度对燃烧后期的影响更显著。模拟结果表明，传热和残余气体分布共同决定了热分层模式。壁面温度对末端气体自燃过程有显著影响，而对火焰早期传播影响不大。相比之下，进气温度的升高会显著促进火焰的早期传播，进而促进自燃。早期自燃（MFB 65%之前）对进气温度非常敏感，而随着燃烧的进行，由于壁面温度对末端气体热分层的控制能力较强，其敏感性明显降低，实验中观察到的进气温度情况δ¯CA 90较低。
In this research, experiments and CFD simulations were carried out to investigate the effect of thermal stratification on the SI–CAI hybrid combustion characteristics. Experimental results indicated that increasing both coolant temperature and intake temperature would enlarge the peak heat release rate and shorten the combustion duration, while the control capability offered by changing intake temperature was more notable. The relative sensitivity of changes among combustion characteristics (R) showed that the intake temperature has greater effect on the initial combustion whilst the coolant temperature has more significant effect on later combustion stage. Simulation results revealed that the heat transfer and residual gas distribution codetermine the thermal stratification pattern. The wall temperature has a significant effect on the end-gas auto-ignition process while showing little effect on the early flame propagation. In comparison, the increase of intake temperature would significantly enhance the early flame propagation and in turn advances the auto-ignition. The early auto-ignition (before MFB 65%) is significantly sensitive to the intake temperature whilst the sensitivity apparently decreases as the combustion proceeds because of the strong control capability of the wall temperature on the thermal stratification of the end-gas, which demonstrates the lower δ¯ CA 90 for the intake temperature cases observed in the experiments.
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DOI：
10.4271/2001-01-1880
发表时间：
2001-12
期刊：
--
影响因子：
--
作者：
M. Iida;Tanet Aroonsrisopon;M. Hayashi;D. Foster;Jay K. Martin
通讯作者：
M. Iida;Tanet Aroonsrisopon;M. Hayashi;D. Foster;Jay K. Martin
DOI：
10.4271/2010-01-2237
发表时间：
2010-10
期刊：
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影响因子：
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T. Joelsson;R. Yu;X. Bai;N. Takada;Ischiro Sakata;H. Yanagihara;J. Lindén;M. Richter;M. Aldén;B. Johansson
影响因子：
3.2
作者：
H. Persson;R. Pfeiffer;Anders Hultqvist;B. Johansson;Hans Strom
通讯作者：
H. Persson;R. Pfeiffer;Anders Hultqvist;B. Johansson;Hans Strom
DOI：
10.4271/2004-01-2994
发表时间：
2004-10
期刊：
SAE transactions
影响因子：
--
作者：
Magnus Sjöberg;J. Dec;A. Babajimopoulos;D. Assanis
通讯作者：
Magnus Sjöberg;J. Dec;A. Babajimopoulos;D. Assanis
DOI：
10.4271/2011-01-1179
发表时间：
2011-04
期刊：
--
影响因子：
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作者：
Laura Manofsky;J. Vavra;D. Assanis;A. Babajimopoulos
通讯作者：
Laura Manofsky;J. Vavra;D. Assanis;A. Babajimopoulos