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SIMULATION AND EXPERIMENT FOR
THREE-DIMENSIONAL COMBUSTION TEMPERATION FIELD IN
DIRECT-INJECTION
DIESEL ENGINE
LIU Yongfeng1, 2 Zhang Youtong1 QIN Jianjun3 PETERS Nobert
4
(1. School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081;
2. School of Mechanical-Electronic and Automobile Engineering, Beijing Institute of Civil Engineering and Architecture, Beijing 100044;
3. Sclool of Mechanical, Electronic and Control
Engineering, Beijing Jiaotong University, Beijing 100044;
4.Institute für Technische Mechanik, RWTH-Aachen, Aachen 52056, Germany
)
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Abstract: To
calculate the combustion temperature in direct-injection diesel engine
the mixture fracture space is presented. The mixture fracture function
is introduced and the connections between species and mixture fraction
are deduced. The classic non-premixed flame structure is analyzed based
on flamelet assumptions and the connections between temperature and
mixture fraction are carried out in the adiabatic condition. So the
temperature equation is deduced with mixture fraction equation through
the space coordinates change, and a way of separating the numerical
effort associated with the solution of the turbulent flow field from
that of solving the chemistry is offered. The connections between
temperature and scalar dissipation rate and between temperature and
mixture fraction and the flame temperature profile are carried out
through a series of parameters. Further the calculational results are
compared with the experiment data. A new way to simulate combustion temperature
and further for pollutants in direct-injection diesel engine is
presented.
Key words: Direct-injection diesel engine
Flamelet assumptions
Turbulent combustion
Mixture fraction
CLC No: TU42
北京市教委科研项目(KM200710016013)、北京市优秀人才培养(20051D0501705)和北京建筑工程学院2005年专项科研基金(1005039)资助项目. Received 20060220, received in revised form 20060914
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