Abstract
Some effects of valve chest on noise and vibrations generated in a test valve are investigated experimentally and theoretically in close relation to flow patterns of internal supersonic air flow and acoustic modes in the valve chest. The test valve consists of a conical plug, a plane seat and a circular chest, and high pressure air is discharged into atmosphere through the valve. The experimental pressure ratio is less than twenty. It is found that the valve chest significantly affects the internal flow, and so noise and vibrations characterized by it are generated. At a relatively large lift and a high pressure ratio, the levels of noise and vibrations increase significantly. This increase is caused by an oscillating conical flow which can be controlled by the characteristics of the valve chest-resonator for certain flow conditions and the geometries. At a relatively small lift, a bending vibration of valve stem is induced by an unstable flow in transition of flow patterns.
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