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Abstract

The present paper attempts to give a broad review of tests performed with air as a cheaper and more accurate option when compared with tests using incompressible flows. The work presents a description of an aerodynamic test- bench for examining models of hydraulic machines. Experimental and theoretical values of local velocity and density were determined at several axial planes. Test results were also used to show how water machine models can be equally tested in air tunnels. Analysis is supported by the theory of dynamic similarity. The work presents a qualitative and quantitative description of actual cases based on model tests. With special emphasis on conditions of similarity, which have a fundamental significance in the design of hydraulic machines, the author explains the possibility of supplementing them by using air as the working medium. The influence of Reynolds number, roughness and turbulence is also discussed.

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References

Pejovic

Similarity in hydraulic vibration of power plants. Joint ASCE/ASME International Conference on

Fluid Machinery, San Diego, 1989 5–11.

Pejovic

Similarity in hydraulic transients. Pressure Surges. In Proceedings of 6th International Conference BHAR, 1990 pp. 221–232.

Lee

T. S.

Numerical computation of fluid pressure transients in pumping installations with air entrainment. Int. J. Numer. Meth. in Fluids, 1991 12, 747–763.

Melbourne

W. H.

Turbulence effects on maximum surface pressure: A mechanism and possibility of reduction. In Proceedings of 5th International Conference on

Wind Engineering, Vol. 1, 1997 pp. 541–551 (Pergamon Press, Oxford).

Chen

C. J.

Patel

V. C.

Near-wall turbulence models for complex flows including separation. Am. Inst. Aeronaut. Astronaut., 1988 26, 641–648.

Rodi

Experience using two-layer models combining the k-E model with one-equation model near the wall. Am. Inst. Aeronaut. Astronaut., 1991 paper 91–0609.

Gartshore

I. G.

The effects of free-stream turbulence on the drag of rectangular two-dimensional prism. Boundary Layer Wind Tunnel Laboratory research report, BLWT-4–73, University of Western Ontario, 1973 pp. 1–12.

Ligrani

P. M.

Moffat

R. J.

Structure of transitionally rough and fully rough turbulent boundary layers. J. Fluid Mechanics, 1986 162, 69–98.

Bognar

Die Bestimmung des Geschwindigkeitsfeldes um ein Einzelprofil mit Hilfe der Singularitatsmethode. Mitteilung der Konferenz fur Wasserkraftmaschinen, Timisoara, 1964.

10.

Matsumoto

Shimahara

Fujii

Daito

Investigation on turbulence effects on bluff aerodynamics. In Proceedings of 14th National Symposium on

Wind Energy, Tokyo, 1996.

Using aerodynamic methods for the testing of hydraulic machines

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