Abstract
A circular cylinder of 50 mm diameter (D) was placed in a two-dimensional jet. The flow pattern was changed by mounting two large flat plates symmetrically near the cylinder maintaining a clearance (C) between the cylinder and each plate. The half-angle (ψ) between the plates and the clearance were varied (ψ=20°∼60° ; C/D≤0. 3). The jet velocity and nozzle-to-cylinder distance (L) were also changed. The pressure distribution around the cylinder for the case of C/D≤0. 1 differs markedly from that for the case of C/D≥0. 2. In the former case, pressure fluctuation is suppressed and no peak is observed in the spectrum of velocity fluctuation. Thus, the suppression of self-induced flow oscillation is suggested for the case of C/D≤0. 1. The value of peak Nusselt number changes remarkably with the values of ψ and C/D. The mean Nusselt number is clearly larger in any geometrical condition other than that obtained without an insertion of the plates.
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