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The effect of splitting timing on mixing in a jet with multiple injections: A large-eddy simulation study

Hadadpour, Ahmad LU ; Bai, Xue-Song LU and Jangi, Mehdi LU (2017) Tenth mediterranean Combustion Symposium
Abstract
We present large-eddy simulation (LES) of a high-pressure air jet that is injecting into a quiescent inert environment. The injection is through a nozzle with a diameter of 1.35 mm. Four injection strategies are considered in which the results of a single continuous injection case are compared with those of double injection cases with different injection splitting timing. In all double injection cases, the injection pausing interval is kept the same, and the total injected mass is equal to that of the single injection case. On the other hand, the splitting timing is varied to investigate the effects of various injection splitting strategies on the mixture formation and the penetration length of the jet. Results show that the jet... (More)
We present large-eddy simulation (LES) of a high-pressure air jet that is injecting into a quiescent inert environment. The injection is through a nozzle with a diameter of 1.35 mm. Four injection strategies are considered in which the results of a single continuous injection case are compared with those of double injection cases with different injection splitting timing. In all double injection cases, the injection pausing interval is kept the same, and the total injected mass is equal to that of the single injection case. On the other hand, the splitting timing is varied to investigate the effects of various injection splitting strategies on the mixture formation and the penetration length of the jet. Results show that the jet penetration length is not so sensitive to the splitting timing whereas the mixing quality can significantly change as a result of shifting the onset of injection splitting toward the end of injection. Especially, it is found that by adopting a post-injection strategy where a single injection splits into the main injection and late small injection near the end of injection period the mixing between the injected air and ambient is significantly improved. This trend is not as obvious when the injection splitting timing shifts toward the beginning or even in the middle of injection period. (Less)
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in press
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12 pages
conference name
Tenth mediterranean Combustion Symposium
language
English
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yes
id
f8008fff-9aa7-4715-85a5-ed82c824ee60
alternative location
http://ircserver2.irc.cnr.it/wordp/wp-content/uploads/2017/09/TC6_Jangi.pdf
date added to LUP
2017-09-26 11:15:56
date last changed
2017-09-27 16:15:45
@misc{f8008fff-9aa7-4715-85a5-ed82c824ee60,
  abstract     = {We present large-eddy simulation (LES) of a high-pressure air jet that is injecting into a quiescent inert environment. The injection is through a nozzle with a diameter of 1.35 mm. Four injection strategies are considered in which the results of a single continuous injection case are compared with those of double injection cases with different injection splitting timing.  In all double injection cases, the injection pausing interval is kept the same, and the total injected mass is equal to that of the single injection case. On the other hand, the splitting timing is varied to investigate the effects of various injection splitting strategies on the mixture formation and the penetration length of the jet. Results show that the jet penetration length is not so sensitive to the splitting timing whereas the mixing quality can significantly change as a result of shifting the onset of injection splitting toward the end of injection. Especially, it is found that by adopting a post-injection strategy where a single injection splits into the main injection and late small injection near the end of injection period the mixing between the injected air and ambient is significantly improved. This trend is not as obvious when the injection splitting timing shifts toward the beginning or even in the middle of injection period. },
  author       = {Hadadpour, Ahmad and Bai, Xue-Song and Jangi, Mehdi},
  language     = {eng},
  pages        = {12},
  title        = {The effect of splitting timing on mixing in a jet with multiple injections: A large-eddy simulation study},
  year         = {2017},
}