LES Analysis of Flow and Turbulence Mixing in an Unsteady Jet

The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence intensity on the turbulent eddy structure and mixing process between nozzle fluid and ambient fluid were investigated. The results show that tor...

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Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 72; no. 721; pp. 2265 - 2270
Main Authors KAWANABE, Hiroshi, KAWASAKI, Kiyoshi, SENO, Toshio, KONDO, Chihiro, SHIOJI, Masahiro
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 2006
Subjects
Computational Fluid Dynamics
Entraining Flow
Jet
Large Eddy Simulation
Turbulent Mixing
Unsteady Flow
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Abstract The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence intensity on the turbulent eddy structure and mixing process between nozzle fluid and ambient fluid were investigated. The results show that toroidal-shape vortex, which is growing up around jet tip, mainly accelerate the entraining flow. Also, increasing the turbulence intensity in the nozzle encourages the mixing in the jet without change of the jet-contour. Furthermore, when the rise-up time of initial nozzle velocity is elongated, turbulent mixing is suppressed.
AbstractList The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence intensity on the turbulent eddy structure and mixing process between nozzle fluid and ambient fluid were investigated. The results show that toroidal-shape vortex, which is growing up around jet tip, mainly accelerate the entraining flow. Also, increasing the turbulence intensity in the nozzle encourages the mixing in the jet without change of the jet-contour. Furthermore, when the rise-up time of initial nozzle velocity is elongated, turbulent mixing is suppressed.
Author SENO, Toshio
KAWANABE, Hiroshi
KONDO, Chihiro
KAWASAKI, Kiyoshi
SHIOJI, Masahiro
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  fullname: KAWANABE, Hiroshi
  organization: Graduate School of Energy Science, Kyoto University
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  fullname: KAWASAKI, Kiyoshi
  organization: Graduate School of Energy Science, Kyoto University
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  fullname: SENO, Toshio
  organization: Graduate School of Energy Science, Kyoto University
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  fullname: KONDO, Chihiro
  organization: Graduate School of Energy Science, Kyoto University
– sequence: 5
  fullname: SHIOJI, Masahiro
  organization: Graduate School of Energy Science, Kyoto University
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References (4) Kawasaki, K., Shioji, M. and Fang, F, Effects of Boundary Conditions on Jet-flows Simulated by LES, Transactions of the Japan Society of Mechanical Engineers, Series B, Vol. 70, No. 691 (2004), 723-728.
(3) Ikegami, M., Shioji, M. and Kawanabe, H., Turbulent Eddies in Gaseous Jet Diffusion Flames, Proc. of 9th Symp. on Turbulent Shear Flows (1993-8) Paper No. 31-4.
(2) Shioji, M., Nakamura, K., Ishiyama, T. and Ikegami, M., Study of Injection and Jet-Development of High-Pressure Gaseous Fuels, Proc. of 14th Internal Combustion Engine Symposium (1997-8), 169-174.
(1) Shioji, M., Nakamura, K., Miyajima, K. and Ikegami, M., Study of High-Pressure Unsteady Gas-Fuel Jets, Proc. of 13th Internal Combustion Engine Symposium (1996-7), 19-24.
(5) Takeuchi, S. et. al., Direct Numerical Simulation of Turbulent Round Jet, Transactions of the Japan Society of Mechanical Engineers, Series B, Vol. 65, No. 640 (1999), 3918-3925.
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Snippet The flow and mixing process of unsteady jets are fundamentally analyzed by using large eddy simulation (LES). The effects of nozzle velocity and turbulence...
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SubjectTerms Computational Fluid Dynamics
Entraining Flow
Jet
Large Eddy Simulation
Turbulent Mixing
Unsteady Flow
Title LES Analysis of Flow and Turbulence Mixing in an Unsteady Jet
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