A study on the turbulent kinetic energy transport characteristics in the impingement region of an impinging jet issuing from a long circular pipe

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (20) : 258-269.

HUANG Haijin1, WANG Duoyin1,2, CHEN Ming1,2, MA Xinlin1

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Abstract

To reveal the turbulent kinetic energy transport characteristics in the impingement region of an impinging jet, the turbulent kinetic energy balance in the impingement region with different Reynolds numbers is investigated by using a two-dimensional particle-image velocimetry. The production, the convection, the turbulent diffusion and the viscous diffusion terms of the turbulent kinetic energy transport equation are calculated directly from the measured velocity fields. In addition, the pressure diffusion and the dissipation terms are merged together and calculated as the residual of the turbulent kinetic energy transport equation. The results show that: (1) the direction of the energy transports caused by the convection process is consistent with the mean velocity field. The direction of the energy transports caused by the turbulent diffusion process is oblique to the mean velocity field in the inner shear layer of a free jet, while what is caused by the viscous diffusion process is vertical to the mean velocity field. (2) the turbulent kinetic energy balance in the outer, the middle and the inner layers of the impingement region are quite different. (3) the negative production term in the inner layer of the impingement region is caused by the negative work power generated by the radial and the tangential Reynolds stresses. The turbulent kinetic energy loss caused by the production term is compensated by the pressure diffusion term. (4) the energy carried away from the impingement region in the radial convection process is compensated by the axial convection process. (5) the above physical processes are basically not affected by the Reynolds number. The contribution intensity of each energy balance term to the turbulent kinetic energy, however, is significantly affected by the Reynolds number.
Key words: impinging jet; impingement region; turbulent kinetic energy; transport characteristic; experimental investigation

Key words

impinging jet / impingement region / turbulent kinetic energy / transport characteristic / experimental investigation

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HUANG Haijin1, WANG Duoyin1,2, CHEN Ming1,2, MA Xinlin1. A study on the turbulent kinetic energy transport characteristics in the impingement region of an impinging jet issuing from a long circular pipe[J]. Journal of Vibration and Shock, 2022, 41(20): 258-269

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