INFLUENCE OF MUTUAL CIRCUMFERENTIAL SHIFT OF STATORS ON THE NOISE GENERATED BY SYSTEM OF ROWS STATOR-ROTOR-STATOR OF THE AXIAL COMPRESSOR

D. V. Kovalev, V. E. Saren and R. A. Shipov

The Central Institute of Aviation Motors Aviamotornaya st. 2, Moscow, 111116, Russia [2]

Abstract As it was established in works [1-4], mutual circumferential shift of stators in a system of rows stator (IGV)-rotor (R)-stator (S) of the axial compressor signif­icant change of pressure pulsations on the rotor blades and in a stream causes (clocking effect). It is possible to expect that similar change of pressure pul­sations infliences also on the noise, radiated by the specified system of rows. The given work is devoted to an experimental research of infUence of stators clocking on the noise, radiated by rows upwards on a stream.

The basic idea of work consists in comparison of measurements of noise pressure in an entrance plenum of the experimental installation, containing in a working part system of rows IGV-R-S, with pressure pulsations on R blades and with intensity of periodic vortexes behind them at mutual circumferential shift of IGV and S. Such comparison allows not only to estimate scales of stator clocking inflience on the radiated noise but also to establish the basic sources of observably effects. The received results result in a conclusion, that optimization of a mutual circumferential position of stators may be effective means of de­crease of the noise, caused by a rotor-stator interaction in system of rows stator – rotor-stator. The main source of the effect is change of amplitude of pressure pulsations on R blades at stators clocking.

Keywords: Clocking effect, compressors noise