一次元LDVによる斜流羽根車内の三次元流れ場の測定

概要

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Velocity distributions in the rotating cascade of the diagonal flow fan with design vortex of constant circumferential velocity were investigated minutely by one-dimensional LDV. Particular instructions in deciding the measuring conditions, especially on the setting of shift frequency, was described to obtain exact data without dropping out the reasonable signals including the informations of turbulence and the circumferential changes of velocity. A detailed information of secondary flow in the cross section due to the non-uniform blade load distribution was obtained. Tip leakage flow appearing at the middle chord region is restricted in the thin region near casing in the rotor passage, but expands toward midspan at the downstream of the rotor. Two different flow mode are found occurring alternately in every velocity component at the almost measuring points. One is undisturbed vane-fit flow and the other is disturbed flow. It is emphasized that these two flow mode must be analyzed separately to obtain accurate flow information.
一般社団法人日本機械学会の論文
1993-02-25