Abstract
gas flow in the interblade channels of the stationary cascade as they affect the choice of combination of numbers of moving and stationary blades with the analogous conditions for the onset of hydrodynamic disequilibrium, interpreted as the presence of transient periodic forces and torques acting on the stationary vanes of a turbomachine at the impeller blade frequencies with aerodynamic interaction of the cascades. We derive a relation for estimating the maximum ratio of the number of moving to stationary blades and the condition whereby acoustic pressure oscillations in harmonics of the impeller blade frequency are unamplified simultaneously in the gas flow in the interblade channels of the stationary cascade and in the discharge outlet of an axial:flow turbomachine. We demonstrate theoretically and confirm experimentally the possibility of the generation of pressure pulsations and, as a consequence, casing vibrations of turbomachinery in the presence of interaction of rotational pressure modes with the vanes of the stationary cascade in rotational harmonics of these modes that are multiples of the number
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More From: Journal of Applied Mechanics and Technical Physics
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