Acoustic mechanism and noise reduction optimization of globe valve in air conditioning system

Abstract

The globe ball valve will invariably emit inevitably generates noise during operation. The flow field characteristics and sound field characteristics inside the shut-off throttle were obtained by numerical calculations. In order to suppress the noise, this paper proposes an optimized model for this type of valve. Optimization valves were set up for different simulation groups to identify the appropriate fillet radius. The effect of the two strategies on noise reduction is examined in terms of noise distribution, path lines form, and turbulence distribution. The results show that the main throttling area of the valve generates more noise compared to the secondary throttling area. The sound power level values are highest in the center and decrease from there to the wall. The best noise reduction effect was achieved by rounding the radius of 8 mm in the primary throttling area. The maximum noise reduction in the primary throttling area is 0.45 dB, and the maximum noise reduction in the secondary throttling area is 7.5 dB. For sensitive locations in the secondary throttling area, rounded corners improve local noise reduction, with radius of 5 mm providing the best noise reduction. Maximum sound power level values are reduced by 5.8 dB and 6.86 dB in the primary and secondary throttling areas, respectively.