An Experimental Analysis of Pressure Pulsations
in the Steam Admission Elements of a Turbine Installation
A. G. Kostyuk, A. I. Kumenko, A. L. Nekrasov, S. V. Kalinin, and S. V. Medvedev
Abstract—The results of an analysis of the dynamic-acoustical characteristics of the system, the control valve-
steam pipe-nozzle box (CVSPNB), and full-scale experimental studies of two turbines with the aid of computer
technologies and analog-digital methods are presented. New qualitative and quantitative data on the pulsational
characteristics of flows in the steam admission system and their correlation with the vibrational characteristics
of the movable elements in the valves and the supports of the turbine installation are obtained.
Thermal engineering, No. 6, 2000
Analysis of Vibrations in the Steam Piping System
for Steam Turbines
A. G. Kostyuk
Abstract—Vibrations are considered in the system control valve–steam piping (supplying steam to the nozzle
box)–nozzle box of the high-pressure cylinder (the CVSPNB system). A mathematical model for this system is
proposed. It can be used in studying the influence of constructional and performance factors in exciting acoustic
resonance and system stability.
Thermal engineering, No. 8, 1998
Analysis of Subharmonic and Self-Excited Oscillations
of Rotor - Plain Bearing Systems
A. G. Kostyuk, A. L. Nekrasov, and A. I. Kumenko
Abstract—The oscillations of two-support rotors of different stiffness set on two types of plain bearings are
considered. Here, natural oscillations due to an initial disturbance and oscillations that arise after suddenly getting out of balance are analyzed. It is shown that self-excited oscillations of great amplitude and subharmonic
oscillations whose frequencies are fractions of the rotating speed (frequency) can arise in these systems. Among
the latter, the most distinct are subharmonic oscillations whose frequency is equal to one half the rotating frequency.
Thermal engineering, No. 1, 1998
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