Experiments on Reduction in Drag of Circular Cylinder at Transonic Speed by Using Wire


  • Mochamad Dady Ma'mun Universitas Nurtanio Bandung


The effects of small diameter of wires on reducing drag of flow around a circular cylinder at transonic speeds were examined experimentally. The wires were attached longitudinally at an asymmetrical location with regard to the symmetry plane and acted as a barrier restricted upstream propagation of instabilities originate in the downstream wake. The experiment was investigated at Mach numbers of 0.6 and 0.73 and the flow was considered laminar boundary layer on the cylinder surface. The results clearly showed that depending on the Mach number, the wires effectively reduced the pressure drag by 13.2% for Mach number 0.6 and 4.4% for Mach number 0.73, respectively. Assuming the existence of shock waves that produced so-called wave drag, the wires also reduced the total drag: by 14% for Mach number 0.6 and 6% for Mach number 0.73

Author Biography

Mochamad Dady Ma'mun, Universitas Nurtanio Bandung

Department of Aerospace Engineering, Nurtanio Bandung University


Rodriguez, O., “The circular cylinder in subsonic and transonic flow,†AIAA J. 22, 1713-1718 (1984).

Roshko, A.,“On the wake and drag of bluff bodies,†J. Aeronaut. Sci. 22, 124-132 (1955).

Bearman, P. W.,“Investigation of the flow behind a two-dimensional model with a blunt trailing edge and fitted with splitter plates,†J. Fluid Mech. 21, 241-255 (1965)

Achenbach, E. and Heinecke, E.,“On vortex shedding from smooth and rough cylinders in the range of Reynolds numbers 6x103 to 5x105,†J. Fluid Mech. 109, 239-251 (1981).

McCormick, Barnes W., Aerodynamics, Aeronautics, and Flight Mechanics, Jhon Willey & Sons, Inc., New York, 1979.

Thombi, L. and Nakamura, Y., “Suppression on flow separation on a circular cylinder in transonic flow,†Fluid Dynamic Symposium Japan, no 32, 251-254 (2000).

Schlicting, Hermann, Boundary-Layer Theory, 7th ed., translated by Dr. J. Kestin, McGraw-Hill Publishing Co., New York, 1979.

Kusunose, K., Crowder, J.P., and Watzlavick, R.L., “Wave drag extraction from profile drag based on a wake-integral method,†AIAA 99-0275, January 1999.

Roshko, A.,“Experiments on the flow past a circular cylinder at very high Reynolds number,†J. Fluid Mech. 10, 345-356 (1961).

Batham. J. P., “Pressure distribution on circular cylinder at critical Reynolds numbers,†J. Fluid Mech. 57, part2, 209-228 (1973).

Bearman. P. W., “On vortex shedding from a circular cylinder in the critical Reynolds number regime,†J. Fluid Mech. 37, part3, 577-585 (1969).