Some Characteristics of Unstable Flow Past Slots

by Sakir Ethembabaoglu, Research Engr.; Research Center of State Hydraulic Works, Ankara, Turkey; formerly, Post-Grad. Research Fellow, The Norwegian Inst. of Tech., Trondheim, Norway,

Serial Information: Journal of the Hydraulics Division, 1978, Vol. 104, Issue 5, Pg. 649-666

Document Type: Journal Paper


Analysis of flow instability reveals that, as a result of fluid-dynamic feedback, flow fluctuations in the vicinity of slots (or cavities) may occur within narrow-band dominant frequencies and at large amplitudes. An experimental study is made to determine the possible flow patterns and the characteristics of the fluctuating pressures in the neighborhood of slots having five different slot-boundary configurations. The results confirm the existence of well-defined predominantly periodic pressure fluctuations. The relationships among the oscillation frequencies, flow velocities, the oscillation amplitudes, and the slot ratios are determined. The deviations from the analytical results at smaller slot ratios are considered to be due to the nature of the velocity profile of the approach flow and its development in the streamwise direction.

Subject Headings: Fluid flow | Flow profiles | Cavitation | Flow patterns | Pressurized flow | Residential location | Oscillatory flow | Velocity profile

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