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Buffeting forces on rigid circular cylinders in cross flows

Published online by Cambridge University Press:  20 April 2006

Ronald M. C. So  and
Sudhir D. Savkar
Ronald M. C. So
Affiliation:
Corporate Research and Development Center, General Electric Company, Schenectady, New York 12301
Sudhir D. Savkar
Affiliation:
Corporate Research and Development Center, General Electric Company, Schenectady, New York 12301
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Abstract

Experimentally measured steady and unsteady forces induced by a cross flow over a smooth circular cylinder are reported in this paper. The measurements were made in the 0·305 m research water tunnel of the Pennsylvania State University. The parameters examined include the Reynolds number, which was varied over a range of 2 × 104 to 2 × 106, free-stream turbulent intensity, integral length scale-to-diameter ratio and active span-to-diameter ratio; however, this paper includes only some of these results.

Among the results reported are the complete mean drag data on all the cylinders tested and some fluctuating force data chosen to illustrate the effects of Reynolds number and active span-to-diameter ratio on the measured forces in uniform and turbulent cross flows. From these results, it can be concluded that the unsteady forces bear a functional relation to Reynolds number in the range tested which is very similar to the well-documented behaviour of the mean drag. Thus the effect of free-stream turbulence on both the steady drag forces and the unsteady forces is to shift the transitional region to a lower Reynolds number. Decreasing the active span-to-diameter ratio increases the buffeting lift coefficient at the same Reynolds number. Finally, it is observed that the Strouhal lift signal at transitional Reynolds numbers is no longer quasi-periodic but rather resembles a narrow-band random signal.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 105 , April 1981 , pp. 397 - 425
Copyright
© 1981 Cambridge University Press

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References

Achenbach, E. 1968 Distribution of local pressure and skin friction around a circular cylinder in cross-flow up to Re = 5 × 106. J. Fluid Mech. 34, 625.Google Scholar
Batham, J. P. 1973 Pressure distributions on circular cylinders at critical Reynolds numbers. J. Fluid Mech. 57, 209.Google Scholar
Bearman, P. W. 1967 On vortex street wakes. J. Fluid Mech. 28, 625Google Scholar
Bearman, P. W. 1969 On vortex shedding from a circular cylinder in the critical Reynolds-number regime. J. Fluid Mech. 37, 577.Google Scholar
Bendat, J. S. & Piersol, A. G. 1971 Random Data: Analysis and Measurement Procedures. Wiley-Interscience.
Bishop, R. E. D. & Hassan, A. Y. 1964 The lift and drag forces on a circular cylinder in a flowing fluid. Proc. Roy. Soc. A 277, 32.Google Scholar
Bruun, H. H. & Davies, P. O. A. L. 1975 An experimental investigation of the unsteady pressure forces on a circular cylinder in a turbulent crossflow. J. Sound & Vib. 40, 535.Google Scholar
Delany, N. K. & Sorensen, N. E. 1953 Flow speed drag of cylinders of various shapes. N.A.C.A. TN-3038.Google Scholar
Fung, Y. C. 1960 Fluctuating lift and drag acting on a cylinder in a flow at supercritical Reynolds numbers. J. Aero. Sci. 27, 801.Google Scholar
Gerrard, J. H. 1961 An experimental investigation of the oscillating lift and drag of a circular cylinder shedding turbulent vortices. J. Fluid Mech. 11, 244.Google Scholar
Goldstein, S. 1965 Modern Developments in Fluid Dynamics, vol. II, p. 493. Dover.
Humphreys, J. S. 1960 On a circular cylinder in a steady wind at transition Reynolds numbers. J. Fluid Mech. 9, 603.Google Scholar
Jones, G. W., Cincotta, J. J. & Walker, R. W. 1968 Aerodynamic forces on a stationary and oscillating circular cylinder at high Reynolds numbers. N.A.S.A. TR R-300.Google Scholar
Lee, B. E. 1975 Some effects of turbulence scaling on the mean forces on a bluff body. J. Ind. Aerodynamics 1, 316.Google Scholar
Lehman, A. F. 1959 The Garfield Thomas Water Tunnel. Pennsylvania State Univ. Rep. no. NOrd 16597–57.Google Scholar
Loiseau, H. & Szechenyi, E. 1972 Analyse expérimentale des portances sur un cylindre immobile soumis à un ècoulement perpendiculaire à son axe à des nombres de Reynolds élevés. Recherche Aerospatiale 5, 279.Google Scholar
Petty, D. G. 1979 The effects of turbulence intensity and scale on the flow past square prisms. J. Ind. Aerodynamics 4, 247.Google Scholar
Ramamurthy, A. S. & Bhaskaran, P. 1977 Constrained flow past cavitating bluff bodies. Trans. A.S.M.E. I, J. Fluids Engng 99, 717.Google Scholar
Relf, E. F. & Simmons, L. F. G. 1924 The frequency of the eddies generated by the motion of circular cylinders through a fluid. Aero. Res. Counc. R. & M. 917.Google Scholar
Richter, A. & Stefan, K. 1973 Anwendung piezoelektrischer Mehrkompouenten-Kraftmesser in der Stromungsmechanik. Arch. Tech. Messen 5, 131.Google Scholar
Richter, A. & Naudascher, E. 1976 Fluctuating forces on a rigid circular cylinder in confined flow. J. Fluid Mech. 78, 561.Google Scholar
Roshko, A. 1961 Experiments on the flow past a circular cylinder at very high Reynolds number. J. Fluid Mech. 10, 345.Google Scholar
Savkar, S. D. & So, R. M. C. 1978 On the buffeting response of a cylinder in a turbulent crossflow. TIS Rep. no. 78 CRD 119. Research and Development Center, General Electric Company. Also published in BNES Conf. - Vibration in Nuclear Plant, Keswick, U.K., Paper 2.1.
Schmidt, L. V. 1965 Measurements of fluctuating air loads on a circular cylinder. J. Aircraft, 2, 49.Google Scholar
Schmidt, L. V. 1966 Fluctuating force measurements upon a circular cylinder at Reynolds numbers up to 5 × 106. N.A.S.A. TM X-57, 779, 15.1.Google Scholar
Schmidt, L. V. 1970 Influence of Spatial Correlation upon Load Resolution. J. Spacecraft, 7, 363.Google Scholar
So, R. M. C. 1979 An experimental investigation of circular cylinders in crossflows. Nuclear Energy Engng Div., G. E. C., San Jose, California, Report no. GEAP-24176.Google Scholar
Surry, D. 1972 Some effects of intense turbulence on the aerodynamics of a circular cylinder at subcritical Reynolds number. J. Fluid Mech. 52, 543.Google Scholar
Vickery, B. J. 1966 Fluctuating lift and drag on a long cylinder of square cross section in a smooth and in a turbulent stream. J. Fluid Mech. 25, 481.Google Scholar
Wieselsberger, G. 1923 Der Widerstand von Zylinden, Ergebnisse der Aerodynamischen Versuchsanstalt Göttingen, II. Lieferung, p. 23.Google Scholar