Distribution of Flow Pattern in Control Valves and Identification of Flow Pattern Transition by Sound Mutation[J]. 2015, 49(5): 116-121.
DOI:
Distribution of Flow Pattern in Control Valves and Identification of Flow Pattern Transition by Sound Mutation[J]. 2015, 49(5): 116-121.DOI: 10.7652/xjtuxb201505018.
Distribution of Flow Pattern in Control Valves and Identification of Flow Pattern Transition by Sound Mutation
Flow-induced vibration and noise of control valves are experimentally and numerically studied to further investigate the relationships between flow pattern distribution
and vibration noise in a steam turbine. It is found that there exist two flow patterns in small and middle openings. Compared with core flow pattern
the flow pattern attached to the valve seat gets more stable with less noise. Different flow patterns may appear even under the same condition according to different adjustment methods of pressure ratios. A sound mutation caused by the converting of two different flow patterns is experimentally observed by continuously adjusting the pressure ratio
which can be used as a simple and practical way to determine the ranges of core and the annular flows.
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