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Experiments on the turbulence statistics and the structure of a reciprocating oscillatory flow

Published online by Cambridge University Press:  20 April 2006

Mikio Hino ,
M. Kashiwayanagi ,
A. Nakayama  and
T. Hara
Mikio Hino
Affiliation:
Department of Civil Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan
M. Kashiwayanagi
Affiliation:
Department of Civil Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan Present address: Electric Power Development Co., Marunouchi, Chiyoda-ku, Tokyo.
A. Nakayama
Affiliation:
Department of Civil Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan Present address: Ministry of Agriculture, Forestry and Fishery, Japanese Government, Kasumigaseki, Chiyoda-ku, Tokyo.
T. Hara
Affiliation:
Department of Civil Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan Present address: Japan Telegraph and Telephone Corporation, Uchisaiwai-cho, Chiyoda-ku, Tokyo.
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Abstract

A reciprocating oscillatory turbulent flow in a rectangular duct is investigated experimentally by making use of a laser-Doppler velocimeter, hot-wire anemometers as well as electronic digital sampling and processing equipments.

The profiles of the mean velocity, the turbulence intensities, the Reynolds stress and the turbulent-energy production rate are compared for the accelerating and decelerating phases.

The characteristics of such a flow are quite different from wall turbulence which is steady in the mean. In the accelerating phase, turbulence is triggered by the shear instability at a slight distance from the wall but is suppressed and cannot develop. However, with the beginning of flow deceleration, turbulence grows explosively and violently and is maintained by the bursting type of motion.

The turbulent-energy production becomes exceedingly high in the decelerating phase, but the turbulence is reduced to a very low level at the end of the decelerating phase and in the accelerating stage of reversal flow. Spectra and spatial correlations for the various phases are compared. The spectral decay in the high-frequency range for the decelerating phase with high turbulence is far steeper than that of Kolmogorov's −5/3 power law, indicating remarkably high energy dissipation by high-frequency turbulence.

Notwithstanding the great difference between the ensemble-averaged characteristics of the oscillatory flow and those of steady wall turbulence, its basic processes such as ejection, sweep and interactions directed towards and away from the wall are the same as those of ‘steady’ wall turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 131 , June 1983 , pp. 363 - 400
Copyright
© 1983 Cambridge University Press

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