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EXPERIMENTAL AND NUMERICAL STUDY OF THE TURBULENT/NON-TURBULENT INTERFACE IN A TURBULENT ROUND JET FLOW

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Based on two large-eddy simulations (LES) of a non-reacting turbulent round jet with a nozzle based Reynolds number of 8,610 with the same configuration as the one that has recently been investigated experimentally, we examine the scalar turbulent/non-turbulent (T/NT) interface layer in the mixture fraction field of the jet flow between ten and thirty nozzle diameters downstream. Based on the simulations, we investigate probability density functions (pdfs) of the mixture fraction and compare the results to the experimental ones. Furthermore, statistics of the T/NT interface are studied from simulation and experiment with a focus on the pdf of the location of the interface and the mixture fraction profile across it.

Author(s):

Konstantin Kleinheinz    
RWTH Aachen
Germany

Markus Gampert    
RWTH Aachen
Germany

Heinz Pitsch    
RWTH Aachen
Germany

Norbert Peters    
RWTH Aachen
Germany