長い平行環状シールの動的流体力に関する実験的研究 : シリンドリカル運動とコニカル運動が合成された場合の動的流体力

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This paper describes a study of dynamic fluid forces acting on a long seal where the rotating motions of a rotor were composed of conical and cylindrical whirl. Theoretical fluid forces were determined using a bulk-flow model to obtain the rotor-dynamic coefficients of the long seal. The experiment was conducted under changing phase difference between the seal inlet and outlet whirling movements. The tangential and restitutional forces were obtained from the measured dynamical fluid forces at various rotor speeds, whirling amplitude and with different pressure drops across the long seal. Then these measured values were compared with the theoretical finite-length solution and were found to be compatible. As a result, the dynamic fluid forces are largely affected by the whirling phase difference between the seal inlet and outlet. It was confirmed that the total fluid force acting on the rotor is given by the sum of two fluid forces due to the cylindrical whirl and due to the conical whirl, when the rotor and the outer cylinder are set in concentric alignment.
1990-12-25