Analysis and Optimization of Aerodynamic Noise Characteristics of Corbula-Type Throttle Valve
In order to solve the problem of high noise generated by the outer cage throttling valve in the production process,the flow field of the outer cage throttle valve was simulated and calculated by large eddy simulation.The mechanism of generating aerodynamic noise was analyzed based on the flow field characteristics,and structural improvement method was proposed.Through Box-Behnken re-sponse surface design,the hole diameter,number and length of the improved structure were taken as optimization variables.Taking the total sound pressure level of the monitoring point as the optimization objective,the optimization design of noise reduction structure was carried out.The results show that the fluid medium forms multi-scale diversified and complex flow downstream of the valve due to the abrupt orifice structure,and the pressure and velocity pulsation in the flow field are decreased and the turbulence degree is reduced after the structure improvement,which has the effect of secondary throttling and noise reduction.The change of hole diameter has the most ob-vious influence on the total sound pressure level response value of the monitoring point.The error between the numerical simulation re-sults of the corresponding flow channel model and the predicted response value of the system is 1.19%,which verifies the reliability of the optimization results of BBD response surface method.After optimization,the total sound pressure level of the throttle valve is reduced by 13.1 dB,and the expected noise reduction is achieved.
throttle valveflow field simulationaerodynamic noiseresponse surface methodstructure optimization
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