Analysis of low frequency pulsation and profile modification of turbine control valve

Abstract

During the operation of a nuclear power steam turbine's main control valve, the valve frequently operates at a small opening and pressure ratio, causing intense alternating loads and oscillation. To address this, a transient numerical simulation studied low-frequency pulsation and optimized steam. Results showed high amplitude and wide frequency range flow pulsations on the spool and tube wall due to repeated flow field separation. By improving the valve core profile, control over the valve throat jet state reduced pressure pulsation amplitudes significantly, as well as mitigating flow-induced vibration in the valve core cavity and pipeline.