Abstract
Ball valve is the core control component for flow in HVAC (Heating, Ventilation and Air Conditioning) system. And valve's flow noise is one of the key parameters to evaluate its performance. Ball valve's flow field is modeled by finite element method based on Lighthill acoustic theory. And turbulent kinetic energy of the flow field is obtained. The noise generation mechanism of ball valve's flow is obtained by analyzing the contours of pressure, velocity and sound pressure level. In order to reduce sound pressure level of ball valve, noise reduction scheme was proposed. And ball valve was reformed. Flow field characteristics of the modified ball valve are analyzed by numerical simulation method. The feasibility of noise reduction scheme is verified by experiments. The results show that refitted ball valve has good noise reduction effect while guaranteeing small change of flow.
Highlights
Ball valve has been widely used in HVAC system for its simple mechanism and easy operation
The flow field of the ball valve are analyzed with theory
(1) Flow noise of ball valve belongs to jet noise which is caused by Reynolds stress in jet transition region and eddy current in flow field
Summary
Ball valve has been widely used in HVAC system for its simple mechanism and easy operation. J. Zhang et al.: Research on Noise Generation Mechanism and Noise Reduction Ball Valve Measures of Ball Valve change of compressible flow. Zhang et al.: Research on Noise Generation Mechanism and Noise Reduction Ball Valve Measures of Ball Valve change of compressible flow She set water injection at the point where sound generation to reduce noise of control valve [12]. Jin-yuan Qian et al studied Mach number and energy loss which inducted noise They pointed that noise increase with the increasing of pressure ratio [15]. Victor P et al tested a model of 28’’-diameter gate valve’s sound pressure level They pointed that the noise was caused by vortex shedding. Source of turbulent noise in the flow field of ball valves is theoretically expounded based on the Lighthill acoustic theory. Effective measures to reduce flow noise are put forward
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