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SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 63, Issue 4: 244711(2020) https://doi.org/10.1007/s11433-019-1458-4

Non-premixed turbulent combustion modeling based on the filtered turbulent flamelet equation

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  • ReceivedSep 2, 2019
  • AcceptedOct 10, 2019
  • PublishedNov 25, 2019
PACS numbers

Abstract

In turbulent combustion simulations, the flow structure at the unresolved scale level needs to be reasonably modeled. Following the idea of turbulent flamelet equation for the non-premixed flame case, which was derived based on the filtered governing equations (L. Wang, Combust. Flame 175, 259 (2017)), the scalar dissipation term for tabulation can be directly computed from the resolved flowing quantities, instead of solving species transport equations. Therefore, the challenging source term closure for the scalar dissipation or any assumed probability density functions can be avoided; meanwhile the chemical sources are closed by scaling relations. The general principles are discussed in the context of large eddy simulation with case validation. The new model predictions of the bluff-body flame show sufficiently improved results, compared with these from the classic progress-variable approach.


Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant No. 11572330). LiPo Wang thanks the support from the Engineering Research Center of Gas Turbine and Civil Aero Engine, Ministry of Education; Jian Zhang thanks the support from International Clean Energy Talent Program by China Scholarship Council (Grant No. 201904100044) and Open founding of National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics (Grant No. 6142702180307).


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