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When the link butterfly valve operates at a small opening degree in high temperature working conditions,it is prone to the problem that the valve is stuck,the strength is insufficient and the butterfly plate is violently vibrating.This paper shows simulation experiments of both thermal-fluid-structure coupling and resonance forecast about DN600 link butterfly valve in the working conditions of 250℃ and 0.5 MPa by ANSYS software.The medium is mixed with compressed air and flue gas.Flow field characteristics of the valve and stress deformation,modal and flow-induced vibration of butterfly plate are analyzed when the valve opening is less than 30%.The results indicate that,when the valve opening is less than 30%,fluid flow is relatively smooth in front of butterfly plate,a large number of vortexes are found behind the butterfly plate,and fluid flow is greatly chaotic in this position.The equivalent maximum stress and deformation of butterfly plate are relatively large when the valve locates in openings between 10% and 30%; the intensity of the butterfly plate is enough; the axial deformation does not impact opening and closing of the valve.The butterfly plate is likely resonant when the valve opening is less than 10%.The research of this paper provides a crucial reference for flow field characteristics of link butterfly valve,an analysis of intensity and rigidity of butterfly plate,and a resonance forecast of butterfly plate when the valve works in small opening. 相似文献
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为了解决动态流量平衡阀流量控制精度无法达到要求的问题,建立了动态流量平衡阀动力学模型以及阀芯运动方程,数值模拟了相同口径和不同口径平衡阀阀芯处于不同位移下的三维流场模型,对比试验与数值模拟的阀芯位移误差和压差位移流量特性曲线,获得了线弹性不等值力变化规律,确定了不等值力修正系数,并优化了开孔型线.研究结果表明:通过引入线弹性不等值力修正系数,优化阀芯可变开孔后,减小了阀芯实际位移与理论位移间的误差,使试验与数值模拟的流量特性曲线趋于一致,并使流量控制精度满足5%的误差要求. 相似文献
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