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Numerical Study of Spray Combustion Using Flamelet Generated Manifold Model(PDF)

《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

Issue:
2020 01
Page:
32-36
Research Field:
Publishing date:

Info

Title:
Numerical Study of Spray Combustion Using Flamelet Generated Manifold Model
Author(s):
Zhou Qiyan 1Qian Yong 1Ma Likun 2Lü Xingcai 1
1. School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;2. School of Aerospace Science,National University of Defense Technology,Changsha 410073,China
Keywords:
flamelet generated manifold(FGM)spray combustionOpenFOAM
PACS:
TK11
DOI:
10.11715/rskxjs.R201903007
Abstract:
A flamelet generated manifold(FGM)model is developed in the framework of OpenFOAM.Welldocumented (engine combustion network ECN)n-heptane spray combustion known as Spray H is simulated to assess the applicability of FGM model in spray combustion modelling.The results show that the FGM model can precisely capture ignition delay.The comparison of lift-off length based on two different criteria,namely OH mass fraction and temperature rise,indicates that the OH-based definition is less sensitive to threshold value and is in better agreement with the experimental results.In addition,an in-depth analysis of ignition location and combustion process was conducted,showing that ignition happens with the equivalence ratio around 0.8 under both 8% and 12% oxygen concentration.The concentrated production of progress variable corresponds to the temperature peak,and the fastest combustion occurs in the slightly fuel rich zone,where the equivalence ratio is marginally greater than 1.

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Last Update: 2020-01-17