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Yoo, Chun Sang
Clean Combustion & Energy Research Lab
Research Interests
  • Carbon-free combustion
  • Numerical turbulent combustion
  • Combustion modelling
  • Hydrogen/Ammonia Gas turbine combustion

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Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame

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Title
Analysis of second-order conditional moment closure applied to an autoignitive lifted hydrogen jet flame
Author
Richardson, E. S.Yoo, Chun SangChen, J. H.
Issue Date
2009
Publisher
ELSEVIER SCIENCE INC
Citation
PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.32, no.2, pp.1695 - 1703
Abstract
The timing and location of autoignition call be highly sensitive 10 turbulent fluctuations of composition. Second-order Conditional Moment Closure (CMC) provides transport equations for conditional (co)variances in turbulent reacting flows. CMC equations accounting for compressibility and differential diffusion are analyzed using data from direct numerical Simulation of all autoignitive lifted turbulent hydrogen jet flame [C.S. Yoo, R. Sankaran, J.H. Chen, Three-dimensional direct numerical simulation of turbulent lifted hydrogen/air jet flame in a heated coflow. Part 1. J Fluid. Mech., (2008)]. At the flame base. second-order moments were required to accurately model the conditional reaction rates. However, over 80% of the second-order reaction rate component was obtainable with a small subset (16%) of the species-temperature covariances. The balance of the second-order CMC equation showed that turbulent transport across spatial composition gradients initiates generation of conditional variances.
URI
https://scholarworks.unist.ac.kr/handle/201301/7367
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=61849138931
DOI
10.1016/j.proci.2008.05.041
ISSN
1540-7489
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